Datacenter
Switchgear receiving inspection checklist for data center sites
Catch shipping damage, a tripped impact indicator, a wrong nameplate, or a missing accessory at the dock, before you sign the BOL and the claim window closes.
Direct answer
A switchgear receiving inspection is the documented check of MV or LV switchgear, switchboards, and paralleling gear at delivery, before you sign the bill of lading and the freight-claim window closes. Check impact indicators, shipping damage, the packing list, nameplate ratings, and a baseline megger. The approved submittal and manufacturer instructions govern acceptance.
Key takeaways
- Note visible switchgear damage as a specific exception on the bill of lading at delivery; a clean-signed BOL hands the carrier a complete defense.
- Report concealed shipping damage within a few days of delivery, with notice inside 48 hours the disciplined practice to keep the claim alive.
- The formal freight claim commonly has a nine-month floor from delivery under the Carmack framework, but the carrier tariff and BOL set the actual deadline.
- Take a baseline insulation-resistance megger at receipt per ANSI/NETA ATS, phase-to-phase and phase-to-ground for one minute, recording temperature and humidity; never hipot on receipt.
- Verify the nameplate against the approved submittal for voltage class, continuous current, short-circuit rating, BIL, control voltage, enclosure type, and serial numbers, not just voltage.
What a switchgear receiving inspection is
A switchgear receiving inspection is the documented check you run on switchgear, switchboards, and paralleling gear the moment it lands at the site, before you sign for it and before the freight-claim window starts closing. It is not unloading the truck and stacking the crates in a corner. It is a deliberate look at the indicators, the bill of lading, the packing list, the enclosure, and the nameplate, with photos and a signature, while the driver is still standing there.
The reason it matters is brutal and simple. The cheapest place to catch shipping damage is on the truck. The most expensive place is at energization, eighteen months later, when the lineup is set, bused, terminated, and the breaker will not rack in because the structure took a hit in transit that nobody logged.
This gear is long-lead and one-of-a-kind. You do not have a spare lineup on a shelf. A receiving inspection done right turns a shipping problem into a freight claim and a replacement part on the manufacturer's schedule. Done wrong, it turns the same problem into a schedule slip you own, because once you signed the BOL clean, the damage is yours to prove and yours to pay for.
Why receiving is the cheapest place to catch damage
Damage found at the dock is a freight claim. The same damage found after acceptance is an argument, and you are on the losing side of it. That is the whole economics of receiving inspection in one line.
When you note an exception on the bill of lading and photograph it before unloading, the burden sits with the carrier. The shipment was monitored, the damage was visible at delivery, and the paper says so. Once you sign the delivery receipt clean and the truck pulls out, anything you find later is a concealed-damage claim, and the carrier's first move is to argue the damage happened after delivery, on your dock, under your rigging. You now have to prove a negative.
There is a second clock running too. The manufacturer's warranty and the carrier's liability are separate channels with separate deadlines, and both start at delivery. Miss the window on either one and a part that should have been free becomes a purchase order. On a data center build, the part is rarely the problem. The lead time on the replacement is the problem, because it lands on the critical path and pushes the energization date you committed to the owner.
Before the truck arrives
Most failed receiving inspections were lost before the truck showed up, because nobody had the approved submittal, the packing list, and the rigging plan in hand at the dock. You cannot inspect against a spec you do not have. Pull the approved-for-construction submittal and the manufacturer's shop drawings for the lineup, the packing list or bill of materials for the shipment, and the manufacturer's receiving and handling instructions, and have them on site before the gear does.
Know what is actually coming. Large lineups ship in sections, called shipping splits, and a single lineup can arrive on several trucks across several days. Confirm how many splits, which sections are on this truck, and what ships loose, because a section that is whole but missing its loose-shipped bus links and hardware is not a complete delivery.
Have the rigging plan and the people. The lift points, the weight per split, the path from the truck to the storage or set location, and the equipment to move it should be settled before delivery, not improvised at the tailgate. Who must be present is the part crews skip: a person with authority to sign the BOL, someone who can read the submittal, and ideally the manufacturer's field rep or the commissioning agent for a major MV lineup. A driver on a clock and a laborer with a pallet jack is not a receiving team.
How long do I have to file a freight claim?
You have less time than you think, and there are two different deadlines. Visible damage gets noted on the bill of lading at delivery, full stop, because that is the only moment the carrier cannot dispute that it arrived damaged. Concealed damage, the kind you find when you open a crate later, commonly has to be reported to the carrier within a few days of delivery, and a notice within 48 hours of delivery is the disciplined practice that keeps a concealed claim alive.
The formal written claim is a separate, longer deadline. Under the federal Carmack framework that governs interstate motor freight, a carrier generally cannot set the claim-filing period shorter than nine months from delivery, with a further window to file suit. That is the common floor, not a promise. The carrier's tariff, the contract of carriage, and the terms printed on the bill of lading set the actual numbers, so read them and confirm them rather than assuming nine months.
None of that helps if the BOL says the shipment arrived clean. The notation on the delivery receipt at the dock is what preserves the claim. The nine-month filing window is when you assemble and submit it. Treat them as two separate jobs: note it now, file it later, and miss neither.
What does a tripped impact or tilt indicator mean?
A tripped impact or tilt indicator means the shipment took a shock or a lean past the threshold the device was set to catch, and it is the single strongest piece of evidence you will get that the gear was mishandled in transit. Switchgear ships with impact recorders or shock labels, brand names like ShockWatch and ShockDot, and tilt indicators like TiltWatch, mounted on the crate or the structure. They turn bright red when the limit is exceeded. A red indicator is not proof the gear is broken, but it is proof you now have to look closely and document before you accept.
Handle a tripped indicator before you sign, not after. Photograph the red indicator with the serial or section number in frame, photograph the crate and the gear around it, and note the tripped indicator as an exception on the bill of lading by its location and reading. If the lineup carries a recording impact recorder, download or photograph the event log if you can. Then look harder at that section: a tilt indicator that fired often means the section was set down hard on a corner, and the damage is at the base, the pedestal welds, or the breaker rails.
The mistake is treating a red indicator as a formality and signing through it. The indicator did its job by flagging the section that deserves the careful look. Sign clean over a tripped indicator and you have thrown away the best evidence you were ever going to have.
Noting exceptions on the bill of lading
The bill of lading is the legal record of what you received and the condition it was in, and the exceptions you write on it are what convert a vague problem into a payable claim. Be specific. Not damaged, but dented top sheet on Section 4, two-inch gouge at the right rear corner, paint scraped to bare metal, with the section number and the side. The driver signs or initials the exception. Vague notes lose claims. Specific notes win them.
Photograph before you unload, not after. Shoot the load on the truck, the crating, the indicators, and any visible damage while the gear is still on the carrier's equipment, because that timestamp and that location are what tie the damage to the carrier rather than your rigging. Then photograph again as each split comes off and the crating comes apart. Date and identify every photo by section.
If the damage is serious, or an indicator fired and you suspect hidden harm, you can note the shipment as received subject to inspection or refuse the damaged section outright, depending on the project's procedure and the manufacturer's direction. Do not let the driver leave before the exceptions are written and acknowledged. A signed clean BOL is the carrier's complete defense, and once you hand it over, the cheapest moment is gone.
Quantity and completeness against the packing list
A complete-looking lineup is not a complete delivery. Switchgear ships with a long tail of loose items that arrive in separate boxes, and the box that is missing is the one you discover the day the crew needs it. Count everything against the packing list while the truck is there, and log shortages as exceptions.
The usual loose-shipped list is longer than people expect: inter-section bus links and splice kits that join shipping splits, the hardware bags for those joints, control wiring jumpers across splits, racking handles and levering tools for drawout breakers, test plugs and test jumpers, spare fuses, touch-up paint, the keys for the cabinet and the key interlocks, breaker lifting devices or trucks, and the instruction manuals and as-built drawings. Spares the contract called out, spare breakers, spare relays, spare indicating lights, are part of the count too.
Reconcile by serial and item number, not by a glance at the pile. A missing inter-section bus link or a missing racking tool stops the install cold, and on a long-lead lineup the replacement is a special order, not a trip to the supply house. Catch the shortage at receiving while it is the carrier's or the manufacturer's problem to fix, and record exactly which item, by part number, is short.
External and enclosure inspection
Walk the outside of every section first, because the enclosure tells you what the transit was like. Look for dents, racked or out-of-square frames, scraped or chipped paint down to bare metal, bent lifting angles, and crushed or torn crating. A section that sits with a visible twist or a base that does not bear evenly took a hit, and the inside is where the cost lives even when the outside looks minor.
Water is the quiet killer. Look for staining, runs, or rust streaks inside the crate and on the enclosure, water lines on the base, and a wet or collapsed crate, because gear that sat in weather on a yard or rode uncovered absorbs moisture you will pay for at the megger and again at energization. Check the humidity or desiccant indicators if the manufacturer shipped the gear sealed: a humidity card reading high or a spent desiccant bag means the seal failed and the inside is damp.
Open and look at the breaker and instrument compartments at the front. Check that doors close and latch, that the enclosure type matches the submittal, NEMA 1 indoor versus a NEMA 3R or better outdoor rating, and that gaskets and vents are intact. The enclosure rating is part of the spec, not a detail, because a lineup destined for an outdoor pad has to be the weatherproof type the drawings called for, and a substitution shows up here.
Internal inspection where you can reach it
Open what the manufacturer's instructions let you open and look inside, because the structure can hide damage the painted skin does not show. Do not break manufacturer seals or disassemble beyond what the receiving instructions allow, since that can void the warranty, but the breaker cells, the instrument compartments, and accessible bus areas are fair game and are where transit damage concentrates.
On the bus and insulators, look for cracked or chipped insulators and standoffs, cracked bus supports, loose or shifted bus bars, and connections that look disturbed. A hairline crack in a porcelain or epoxy insulator is a flashover waiting for the first energization, and it is invisible from outside the cabinet. Check the main bus joints visually for shift, and confirm the bus bracing and barriers are in place and undamaged.
Cleanliness and foreign material come next. Look for packing debris, loose hardware rattling in the base, metal shavings, and the things that get blamed on the factory but arrived in the box: rodent nests and droppings, insect intrusion, and condensation or frost on cold gear brought into a warm space. A handful of loose hardware in the bottom of a cell is a fastener that backed off in transit, and you want to find where it came from before you find it across an energized bus.
Does the nameplate match the approved submittal?
The nameplate has to match the approved submittal, line for line, because the gear that shows up is not always the gear that was approved, and the dock is where you catch the substitution. Read the nameplate against the submittal and the single-line, and confirm every rating, not just the voltage.
Check the rated maximum voltage and voltage class, the continuous current rating of the main bus and the mains, the frequency, the control voltage, and the short-circuit rating. On low-voltage gear the short-circuit rating is the interrupting rating in kAIC; on medium-voltage metal-clad gear it is the short-circuit and short-time current rating in kA symmetrical, along with the basic impulse level, the BIL. Confirm the breaker frame and trip ratings, the number and arrangement of sections against the single-line, and any arc-resistant rating or enclosure type the spec called out. The serial numbers on the sections have to match the submittal and the packing list.
A nameplate that reads lower than the design is a fail, plain and simple, and it is the kind of error that disappears once the lineup is set and bused. Catch a 65 kAIC lineup where the fault study called for 100 kAIC at receiving, and it is a return. Catch it at commissioning, and it is a redesign or a re-order on the critical path. Photograph every nameplate and file it in the packet against the section number.
- kAIC
- Thousand amps interrupting capacity, the short-circuit rating of low-voltage gear and breakers
- Short-time / short-circuit rating
- The fault current MV switchgear withstands and interrupts, in kA symmetrical, per the submittal
- BIL
- Basic impulse insulation level, the impulse voltage withstand of MV gear insulation
- Enclosure type
- The NEMA 250 rating (1, 3R, 4X, and so on) defining indoor versus weatherproof construction
Do I megger switchgear on receipt?
Megger it on receipt when conditions let you, and treat the reading as a baseline, not a pass-fail acceptance test. An insulation-resistance test at delivery, taken with a megohmmeter on the bus, captures the condition of the insulation before the gear goes into storage, so a later drop tells you the storage hurt it and a wet number on arrival flags transit or weather damage you would otherwise not see until install. Record it. A baseline you did not take is a comparison you cannot make.
Run it the way the acceptance standard does. ANSI/NETA ATS, the acceptance testing specification, calls for insulation-resistance tests on each bus section, phase-to-phase and phase-to-ground, for one minute, at a test voltage from the manufacturer's published data or, absent that, from the NETA table of test values. Record the temperature and relative humidity with every reading, because insulation resistance swings hard with both, and a number without its conditions is not comparable to the next one. Correcting the reading to a standard temperature, commonly 20 degrees C, is what makes the storage-to-install trend mean something.
Two cautions. Do the megger only on de-energized, isolated, grounded-before-and-after gear, and discharge the bus when you are done, because the test charges the insulation and it will bite. And do not run a dielectric withstand or hipot test on receipt, because that is an over-voltage proof test that the manufacturer should authorize and that belongs in the acceptance sequence, not the receiving check. If the gear is cold, wet, or below dew point, dry it and let it stabilize before you read it, or the number is meaningless.
Lineup types and why the type changes the inspection
There is no single switchgear receiving inspection, because there is no single switchgear. What you check, and where it fails in transit, depends on the construction, so identify the type from the submittal before you write the checklist.
Medium-voltage metal-clad switchgear, built to the metal-clad standard, has drawout breakers in compartmentalized cells with grounded metal barriers, primary and secondary disconnecting contacts, and shutters over the primary stabs. The transit-sensitive items are the drawout rails and racking mechanism, the shutter and interlock operation, the primary contacts, and the high-BIL insulators, so the inspection weights racking action, interlocks, and insulator integrity. Metal-enclosed interrupter switchgear, the fused-switch medium-voltage type, weights the switch and fuse mechanisms and the barriers. Low-voltage power circuit breaker switchgear, the metal-enclosed LV standard, has drawout LV breakers and a heavy bus, so it weights the breaker cradle, the bus bracing, and the interrupting rating on the nameplate.
Switchboards and panelboard-style gear are usually fixed-mounted and front-connected, so the weight moves to the bus, the lugs, and the enclosure. Paralleling switchgear and generator paralleling controls add a control and metering cabinet full of relays, PLCs, and wiring that is its own delivery, with its own loose-shipped control jumpers across splits and its own sensitivity to shock and moisture. A lineup with a paralleling section is two inspections in one: the power sections and the controls cabinet, and the controls are the part that arrives with a relay knocked loose and nobody notices until functional test.
Storage, heaters, and the long-lead problem
Switchgear sits. Lead times on MV switchgear and the transformers that feed it now run from roughly a year to several years, well past the build cycle, so gear routinely arrives long before the room is ready and goes into storage where most receiving damage actually happens. The receiving inspection does not end when the truck leaves. It includes setting up storage that keeps the gear in the condition you received it.
Indoor, dry, and heated is the default, and the manufacturer's storage instructions govern the specifics. Energize the cabinet space heaters if the gear has them and power is available, because the heaters exist to hold the inside above the dew point and keep condensation off the insulation and the bus. Where heaters cannot be powered, the manufacturer may call for portable heat or desiccant, and the desiccant has to be checked and replaced on a schedule, not bagged once and forgotten. Keep the gear covered against dust and water without sealing it so tight that moisture condenses under the cover.
Outdoor storage is the hard case and the manufacturer's least-favorite. If a lineup must sit outside, keep it off the ground and level on blocking or dunnage, keep it plumb so water sheds and doors seal, power the heaters, and protect it from standing water and direct weather. Log the storage conditions and re-inspect on a cadence, because a six-month-old desiccant check and a baseline megger from delivery are what prove the gear was preserved when the warranty conversation happens. NFPA 70B, the electrical equipment maintenance standard, and the manufacturer's instructions frame the storage and preservation expectations, and the manufacturer's instructions win where they are stricter.
Handling and rigging
Handle the gear by the points the manufacturer marked, keep it upright, and keep it dry, because the damage you do moving it counts against you, not the carrier. Use the lifting angles, base channels, or jacking points the drawings identify, and never rig from the bus, the breaker cells, or the enclosure sheet. A sling around the wrong member racks the structure and you will not see it until a breaker will not rack in.
Keep it plumb and do not stack it. Switchgear is tall and top-heavy, and a section tipped past a few degrees during a lift or set on an uneven surface racks the frame and throws the drawout rails out of alignment. Many lineups are stamped do-not-stack for the same reason: load on the top crushes the enclosure and the gear inside it. Move sections one at a time, on a level path, with the weight per split confirmed against the rigging plan so the equipment is rated for it.
The receiving handoff to install is where the do-not-stack and keep-dry discipline tends to lapse, because the gear is now the install crew's problem and the receiving paperwork is filed. Carry the handling rules forward into the storage and set sequence. The lineup that survived the truck still has to survive the warehouse and the move to its pad.
The receiving packet and how each finding ties to a lineup section
Every finding in the packet ties to a specific section and compartment, because a finding without a location is a finding nobody can act on. Switchgear is already a numbered structure, so use it: number the shipping splits and the sections, identify the cell or compartment within a section, and key every photo, indicator reading, megger value, and exception to that coordinate, the same way an access-floor packet keys every defect to a tile.
The coordinate is the spine. A note that reads Section 3, Breaker compartment B2, cracked primary insulator, photo 14, walks the next person straight from the single-line to the cell to the picture to the punch item. A note that reads cracked insulator somewhere does not. Set the section numbering once, mark it on the single-line that opens the packet, and use it everywhere so the BOL exception, the photo, the megger record, and the punch item all point at the same physical compartment.
The packet pulls the whole receiving inspection into one defensible record: the bill of lading with its exceptions, the indicator readings, the packing-list reconciliation, the nameplate photos against the submittal, the external and internal findings, the baseline megger with its conditions, and the storage setup. The table below is the spine that ties each finding to a section, a photo, a responsible party, and a status, and it is what converts a stack of photos into evidence.
| Section / compartment | Finding | Evidence | Responsible party | Status |
|---|---|---|---|---|
| S2 | Tilt indicator tripped, noted on BOL | Photo 03, BOL exception | Carrier | Claim filed |
| S3-B2 | Cracked primary insulator | Photo 14 | Manufacturer (warranty) | Open, part on order |
| S4 | Dented top sheet, paint to bare metal | Photo 21, BOL exception | Carrier | Claim filed |
| Loose-ship | Inter-section bus link short 1 | Packing-list reconcile | Manufacturer | Reorder, verified |
| S1 | Baseline megger, ph-gnd, recorded | IR sheet, 22 C / 48% RH | Receiving / NETA tech | Recorded, in band |
Turnover into installation and the commissioning receiving level
The receiving packet is not the end of the line. It is the first gate in the commissioning sequence, the level that confirms the gear arrived as specified and undamaged before any installation work leans on it. In the common commissioning framework the early levels cover factory testing and the delivery or receiving check, and the receiving inspection is exactly that level: the documented proof the equipment was verified at the site against the submittal before it was set.
Hand a clean receiving packet forward and the later levels mean something. Static and energized acceptance testing, the NETA visual-and-mechanical inspection, the bolted-connection torque and low-resistance checks, the acceptance insulation-resistance and dielectric tests, and the functional and integrated testing that follows all assume the gear started right. A baseline megger taken at receiving is the reference the acceptance megger is read against. A nameplate verified at receiving is one less surprise at energization.
Sequence it so the receiving findings close before the work that depends on them. A cracked insulator or a wrong nameplate caught at receiving and carried open into install is a problem that surfaces at the worst possible time, with the lineup set and the schedule committed. Map the packet to the project commissioning plan and the power-quality acceptance pillar, so the receiving record flows into the same chain that ends at integrated systems testing rather than dead-ending in a filing cabinet.
Field example: an MV lineup on delivery
Take a 15 kV metal-clad lineup for a data center, eight sections, shipping in three splits across two days, with a separate paralleling controls cabinet. The submittal, packing list, and manufacturer receiving instructions are on site, the rigging plan is set, and the receiving team has a person with signing authority, a NETA technician, and the manufacturer's rep on call.
The first truck carries Sections 1 through 3. One tilt indicator on Section 2 reads red. The team photographs the indicator with the section number in frame, notes the tripped indicator and a dented top sheet on Section 2 as exceptions on the bill of lading, and the driver initials them. They count the loose-shipped items and find one inter-section bus link short against the packing list, logged as an exception. With the splits offloaded and isolated, the NETA tech runs a baseline phase-to-ground megger on the accessible bus at 22 degrees C and 48 percent humidity and records the readings. Opening Section 3 to the manufacturer's allowed extent turns up a cracked primary insulator in compartment B2, photographed and logged.
The packet closes the receiving level with the carrier claim filed on the tilt-indicator damage to Section 2, a warranty part on order for the Section 3 insulator with the manufacturer's schedule attached, the short bus link reordered, the baseline megger recorded as the install-test reference, and every finding keyed to a section and a photo. The cracked insulator is on the manufacturer's clock instead of the project's. That is the win: a transit defect became a tracked part, not a surprise at energization.
| Section / compartment | Check | Result | Status |
|---|---|---|---|
| S2 | Tilt indicator | Tripped, noted on BOL | Carrier claim filed |
| S2 | Enclosure | Dented top sheet | Carrier claim filed |
| S3-B2 | Internal, insulator | Cracked primary insulator | Warranty part on order |
| Loose-ship | Packing list | Bus link short 1 | Reordered |
| S1-S3 | Baseline megger, ph-gnd | Recorded at 22 C / 48% RH | Reference for acceptance test |
| All | Nameplate vs submittal | Match, photographed | Verified |
Field checklist
Want this checklist to run itself on every job — with photo proof and a signed record crews can hand the customer? That's FieldOS.
What to document
A receiving packet that cannot answer a question a year out did not do its job. Capture enough that someone who was never at the dock can reconstruct what arrived, in what condition, against the submittal it was held to, and what was done about every exception.
Record the shipping-split and section numbering on the single-line, the bill of lading with its exceptions, every impact and tilt indicator reading by section, the packing-list reconciliation with shortages by part number, the external and internal findings with photos keyed to compartments, the nameplate verification against the submittal, the baseline insulation-resistance readings with temperature and humidity, the storage setup and the heater and desiccant status, and the claim status on every exception with its filing date. Where an exception is carried open, record the responsible party and the part-on-order schedule. The table below is the minimum spine.
| Field to record | Why it matters |
|---|---|
| Shipping-split and section numbering | Every other record keys to it; without it the chain breaks |
| Bill of lading and exceptions | The legal record that preserves the freight claim |
| Impact / tilt indicator readings | The strongest evidence of transit mishandling |
| Packing-list reconciliation | Proves completeness; shortages are long-lead reorders |
| Nameplate vs submittal | Catches substitution before the lineup is set and bused |
| External and internal findings, photos | Locates damage by compartment for the claim and the fix |
| Baseline megger with conditions | The reference the acceptance test is read against |
| Storage, heater, and desiccant status | Backs the warranty and preservation argument later |
| Claim status and filing dates | Shows the carrier and manufacturer windows were met |
Common mistakes
- Signing the bill of lading clean when there is visible damage or a tripped indicator, which hands the carrier a complete defense.
- Missing the claim window, reporting concealed damage late or never filing the formal claim, so a free part becomes a purchase order on the critical path.
- Treating a red impact or tilt indicator as a formality and not photographing or noting it before signing.
- Skipping the baseline megger, so there is no reference to prove whether storage or transit hurt the insulation.
- Counting the gear by a glance instead of reconciling against the packing list, then discovering a missing bus link or racking tool at install.
- Not checking the humidity or desiccant indicators and never re-checking desiccant in storage, so wet gear goes undiscovered until energization.
- Reading only the voltage on the nameplate and missing a short-circuit rating below what the fault study required.
- Leaving switchgear in storage with the space heaters unpowered, or stored outdoors without keeping it plumb, off the ground, and covered.
- Rigging from the bus or enclosure instead of the marked lift points, or stacking sections stamped do-not-stack.
- Filing photos with no section coordinate, so a later finding cannot be tied to a compartment, a claim, or a fix.
Standards and references
The acceptance testing framework is ANSI/NETA ATS, the Standard for Acceptance Testing Specifications for Electrical Power Equipment, most recently the 2025 edition. It defines the visual-and-mechanical inspection and the electrical tests for switchgear and switchboard assemblies, including the insulation-resistance test on each bus section, phase-to-phase and phase-to-ground, for one minute at the manufacturer's test voltage or the NETA table value. The receiving inspection is the front end of that acceptance process, and the baseline readings taken at delivery feed the acceptance tests later.
The switchgear itself is built to the IEEE C37 family: metal-clad medium-voltage switchgear to the metal-clad standard in the C37.20.2 range, metal-enclosed interrupter switchgear to C37.20.3, and metal-enclosed low-voltage power circuit breaker switchgear to C37.20.1. Enclosure type ratings follow NEMA 250, which defines the indoor and weatherproof enclosure types the submittal calls out. The exact edition and the rated values for a given lineup come from the approved submittal and the manufacturer's drawings, which govern over any general reference.
Electrical equipment maintenance and the storage and preservation expectations are framed by NFPA 70B, the Standard for Electrical Equipment Maintenance, now written with mandatory language, with the understanding that neither NFPA 70B nor the NETA maintenance specification supersedes the manufacturer's instructions. The freight claim runs on a separate track entirely: the carrier's bill of lading and tariff, and the federal Carmack framework for interstate motor freight, which commonly sets a claim-filing floor of nine months from delivery. Confirm the applicable editions, the enclosure types, and the actual claim deadlines against the submittal, the manufacturer's instructions, and the carrier's documents, because the specific requirement is set by the project and the contract of carriage, not by the rule of thumb.
Units, terms, and conversions
Switchgear receiving crosses ratings, test units, and a few trade synonyms, so the same item reads differently across a submittal, a nameplate, and a test report.
Switchgear, switchboard, and gear get used loosely, but they are not the same construction, so read the type off the submittal. Voltage is given in kV for medium voltage and V for low voltage, and the class is the rated maximum voltage, not the operating voltage. Current is in amps for continuous ratings and kA for fault ratings, with low-voltage interrupting in kAIC and medium-voltage withstand and interrupting in kA symmetrical. Insulation resistance reads in megohms or gigohms, always recorded with the temperature in degrees C or F and the relative humidity, because the reading moves with both. Enclosure type is a NEMA 250 number. The shipping split and section number are not units, but they are the coordinate the whole packet turns on, so set them once and use them everywhere.
- Shipping split
- A factory-divided segment of a lineup that ships as one piece and is field-joined on site
- Bill of lading (BOL)
- The carrier's legal record of the shipment and its condition; the place exceptions are noted at delivery
- Impact / tilt indicator
- A shock or lean sensor on the crate that turns red when a threshold is exceeded in transit
- Loose-shipped
- Items shipped separately from the assembly, such as bus links, racking tools, keys, and spares
- Drawout / racking
- The mechanism that moves a breaker between connected, test, and disconnected positions in its cell
- Insulation resistance (IR)
- The megohmmeter reading across insulation, taken as a baseline at receiving and recorded with conditions
- Concealed damage
- Damage found after delivery with no external sign at the dock; the hardest freight claim to win
FAQ
What do I check when switchgear is delivered?
Check the impact and tilt indicators first, then the bill of lading, the packing list against loose-shipped items, the enclosure inside and out, and the nameplate against the approved submittal. Take a baseline megger where conditions allow, photograph everything by section, and note every exception before the driver leaves.
What if an impact or tilt indicator tripped in transit?
A tripped indicator means the shipment took a shock or lean past its threshold, so document it before you sign. Photograph the red indicator with the section number in frame, note it as an exception on the bill of lading, and inspect that section closely, because the damage is often at the base or the breaker rails.
Do I megger switchgear on receipt?
Yes, where conditions allow, as a baseline rather than an acceptance pass-fail. Run insulation resistance on each bus section phase-to-phase and phase-to-ground per the NETA acceptance method, record temperature and humidity, and ground and discharge before and after. Do not run a hipot on receipt; that over-voltage test belongs in the acceptance sequence with manufacturer approval.
How long do I have to file a freight claim on damaged switchgear?
Note visible damage on the bill of lading at delivery and report concealed damage within a few days, with 48 hours the disciplined practice. The formal written claim commonly has a floor of nine months from delivery under the Carmack framework for interstate motor freight, but the carrier's tariff and the bill of lading set the actual deadlines.
Carrier claim or manufacturer warranty: which covers shipping damage?
Shipping damage is generally the carrier's claim, filed against the bill of lading with the exceptions and photos you took at the dock. Manufacturing defects are the manufacturer's warranty. The two run on separate deadlines, both starting at delivery, so document at receiving to keep whichever channel applies open and provable.
Can I sign the bill of lading if I find damage at delivery?
Sign only after noting the damage as a specific exception on the bill of lading, by section, side, and description, with the driver acknowledging it. Signing a clean delivery receipt over visible damage or a tripped indicator hands the carrier a complete defense and turns a payable claim into a concealed-damage argument you will likely lose.
What loose-shipped items should I look for at receiving?
Reconcile against the packing list: inter-section bus links and splice kits, hardware bags, control jumpers across splits, racking handles and breaker lifting devices, test plugs, spare fuses, cabinet and interlock keys, touch-up paint, manuals, as-builts, and any contract spares. A missing bus link or racking tool stops the install and is a long-lead reorder.
How do I store switchgear that will sit for a year or more?
Store it dry and heated per the manufacturer, energize the cabinet space heaters to hold above dew point, and check or replace desiccant on a schedule. Keep it covered, off the ground, and plumb, and outdoors only as a last resort. Log conditions and re-inspect, since MV switchgear lead times routinely exceed the build cycle.
Should I open the breaker compartments at receiving?
Open what the manufacturer's receiving instructions allow, typically the breaker cells and instrument compartments, but do not break factory seals or disassemble beyond that, which can void the warranty. Inside, look for cracked insulators, shifted or loose bus, disturbed connections, packing debris, loose hardware, and any moisture or rodent evidence, all photographed by compartment.
MV metal-clad vs LV switchgear: does the receiving inspection differ?
Yes. Metal-clad MV gear weights the drawout racking, shutters, interlocks, primary contacts, and high-BIL insulators, and carries a BIL and kA withstand on the nameplate. LV power circuit breaker gear weights the breaker cradle, bus bracing, and the kAIC interrupting rating. Identify the type from the submittal first, because the failure modes and the checklist follow from it.
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