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Technical Guide · Low Voltage Switchgear

How large electrical assemblies are moved without damage: declared tilt and shock limits, packing against damp, plus the documents that travel with the unit.

Motor Control Center

Moving large electrical equipment is not ordinary freight. A complete lineup leaves the works as a rigid steel frame with a fragile geometry inside it.

Weight rarely decides the plan. Tilt, shock, damp and access at both ends decide whether control panels arrive fit to energise.

This guide covers what a specialist mover has to be told. It also covers how a motor control panel must be prepared before it is lifted.

Key Takeaways

  • Declare limits, not distances. Tilt, shock and humidity numbers belong in the transport contract.
  • Both ends are the hard part. Gate width, crane reach and floor loading decide more than the road.
  • Indicators record, they do not protect. Bracing stops the damage, a tilt label only proves it happened.
  • Damp is the quiet killer. Sea air and condensation reach terminals that no impact ever touched.
  • The record settles the claim. Photographs and indicator readings at each handover end the argument.

What moves when an assembly leaves the factory

One assembly rarely travels as one piece. A long lineup is split into bolted sections, and the split is chosen at the drawing stage.

Four kinds of load travel together. The structural sections, the fitted devices, the loose parts and the paperwork.

Industrial control panels are normally tested complete and shipped complete. A long lineup is the exception, not the rule.

What stays fitted is a commercial choice. Relays and meters can travel installed or boxed separately for site fitting.

Ship them installed and you save hours on site. Box them and you remove a whole class of transport damage.

Loose parts decide the packing list. Keys, handles, fixing bolts and gland plates are small, cheap and easily lost.

Most mcc panels are built as several sections for exactly this reason. Each section stays inside a normal crane rating.

Ready for dispatch a row of low voltage control cabinets in a factory hall, each one a separate vertical section
Sections, not one block

A lineup travels as bolted sections

The cabinets above are built as separate vertical sections.

Each section is lifted, crated and shipped on its own pallet.

The two ends decide the transport plan

The road is usually the least difficult part of the journey. The loading bay and the switch room are where projects stall.

A section that is 2.2 metres wide will not pass a 2.0 metre door. Measure the door, then read the drawing.

Five measurements decide most deliveries. Gate width, doorway height, turning radius, crane reach and floor loading.

An industrial control cabinet can weigh more than the forklift rated for the yard. Ask for the floor loading figure in writing.

Then check the offload window. A crane booked for two hours and a convoy arriving late is a failed delivery.

Coastal and inland sites differ here. A port delivery may need a permit, while a mine site may need an escort and daylight only.

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Walk the route with a tape measure.Send the mover photographs of the gate, the ramp and the switch room doorway. A measured route prevents most site surprises.

Tilt, shock and vibration limits you should declare

Every transport contract should carry three numbers. A maximum tilt angle, a shock limit and a vibration band.

For a complete assembly, a tilt limit around 15 degrees is a common starting point. Ask the builder before you sign it off.

Shock limits usually sit in the region of 1 to 2 g for a braced assembly. A cabinet full of relays is less tolerant than an empty one.

Vibration matters over long road legs. Continuous vibration loosens what a single impact would not move.

Recording devices are worth the small cost. A tilt indicator and a shock label cost little and prove what happened.

They record rather than protect. Bracing is what prevents damage, and the labels only tell you whether it worked.

a control panel with its door open, showing relays, breakers and wiring on din rail inside the cabinet
Restrain these

Four things that move inside a cabinet

1
Busbars and supports.Long spans flex, so brace them to the frame.
2
Withdrawable units.Lock every drawer, or travel it separately.
3
Heavy components.Capacitors and reactors need their own restraint.
4
Doors and panels.A door that swings in transit breaks its hinges.

Humidity, salt and condensation on the way

Impact is easy to inspect. Damp is not, and it reaches further into a cabinet.

Three mechanisms cause most corrosion in transit. Sea air carrying chloride, warm days and cold nights, and a sealed crate trapping moisture.

So the packing plan has to name a method. Desiccant bags, vapour phase film or a sealed barrier bag.

Most industrial control panel enclosures leave with gaskets fitted and doors closed. That seal is not a shipping barrier.

A sealed cabinet with damp air inside will condense on the coldest metal. That is usually the busbar, not the wall.

Builders of industrial control panel enclosure manufacturers grade equipment for the room it will serve. Transit needs its own answer.

Then write the unwrapping rule into the site instructions. Keep the barrier on until the switch room is closed and dry.

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Check the desiccant before you sign.Ask for the type and quantity in the packing list. A soft, swollen bag means the barrier failed somewhere on the route.

The documents that must travel with the unit

A shipment is only complete when the paperwork on board matches the goods on board.

Five documents should travel with the unit rather than by email. The packing list, the nameplate record, the routine test report, the indicator readings and the loading photographs.

The routine test report is the one site teams ask for first. It states what was verified in the works before dispatch.

Every assembly leaves against a routine test recorded to IEC 61439. Send a copy inside the crate, not just as a file.

Put the nameplate record with it. Serial numbers and ratings have to be readable when the unit reaches site.

A firm working to ISO 9001 keeps its own dispatch checklist. Ask to see that checklist as part of the offer.

Industrial electrical control panels often sit in store for months before installation. Paper in a crate survives that wait better than an inbox.

Photograph it the busbar chamber inside a low voltage panel, photographed before the doors are closed for shipment
Documents travel too

The loading photographs start inside the panel

The busbar run above is photographed before the doors go on.

Those frames travel in the record with the routine test sheet.

When to ship assembled and when to ship in sections

Three shipping shapes cover nearly every order. Each one trades cost against risk in a different place.

Ship complete when the route allows it. That means one lift, one crate and the shortest site programme.

Ship in sections when access is tight. Site jointing takes longer, but no crane has to lift a whole lineup.

Ship loose only for parts that are genuinely easier to fit later. A bare VSD control panel is rarely one of them.

Interface panels decide the split. A SF6 ring main unit and an harmonic filter panel are both self contained, so both travel complete.

Three shipping shapes and where the risk sits
ShapeWhen it winsWhat it costs
Ship completeClear route at both endsHeaviest lift and the widest load
Ship in sectionsTight doors or no heavy craneSite jointing and a longer programme
Ship looseOnly for parts fitted lateMore boxes to track on site

The choice also changes the design. Control panel industrial automation work assumes certain parts arrive fitted, so agree the split early.

An 11kv switchgear lineup and a backup generator panel rarely ship the same way. Voltage and enclosure shape both change the answer.

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Never split a factory test across two shipments.A section that is tested alone and jointed on site has no complete works record. Test the assembly that will actually operate.

The handover record that settles a damage claim

Damage claims are decided on evidence, not on argument. The record is built at three points on the route.

First on loading, with photographs of the packed unit and its indicator readings. Second at any transfer, where the crate changes vehicle or vessel.

Third at delivery, before unloading begins. Take the reading first, then break the seal, then photograph what you see.

Sign nothing until those steps are done. A clean delivery note signed at the gate is very hard to reopen later.

Keep the record with the unit. When the industrial panel is finally energised, that file is the maintenance history.

One final check on site. Compare the arrival reading with the declared limits in the order, and record any breach in writing.

Frequently asked questions

What should a transport service for electrical equipment include?
It should include four things beyond the road leg. Ask for a route survey with measured clearances. Add a packing method suited to the climate, declared tilt and shock limits, and loading photographs. Ask for all four in the offer. A price per tonne tells you almost nothing about how the unit will arrive.
How do I set tilt and shock limits for a control panel?
Start from the builder's figures rather than from a generic table. For a complete assembly, a tilt limit near 15 degrees is a common starting point. A shock limit between 1 and 2 g is also typical. A cabinet full of relays and meters is less tolerant than an empty enclosure. Ask the factory to confirm the numbers for your build.
Should the equipment be crated or shrink wrapped?
Both, for different jobs. A timber crate or a braced pallet carries the mechanical load and gives you something to lift. A barrier bag or vapour phase film handles the climate. Shrink wrap alone traps moisture against the steel and offers no protection against a dropped pallet.
Who pays when equipment arrives damaged?
It depends on where the damage happened and who held the risk at that point. That is why the delivery term matters so much. Photographs and indicator readings at each handover show when the damage occurred. Without them, the carrier, the packer and the site team all have a reasonable story.
Can large assemblies travel on an open flat rack?
Yes, when the packing is designed for it. An open rack exposes the unit to salt spray and rain, so a barrier is essential. It also removes the need for a crane at the destination in many cases. For a short coastal leg it is often the cheapest workable option.
How long should I allow for delivery?
Allow for four stages rather than one transit time. Packing and loading at the works, the main leg, customs or port handling, and the final road leg to site. The inland stage is the one that slips. Add a week for permits on any abnormal load, and keep the offload crane booking loose.
Should the unit be tested before it is shipped?
Always, and the test record should travel with the unit. A routine test at the works is the only point where the complete assembly is verified under controlled conditions. Retesting on site after a hard journey tests something different. Keep the works record and compare the two only if a problem appears.
Can doors and relays be removed to save space?
Sometimes, and the decision belongs to the builder. Removing doors lowers the crate height and removes a whole class of hinge damage. It also creates a loose parts list and a site fitting task. Agree it in writing, and make sure every removed item appears on the packing list with its section number.
What should be unloaded first at site?
Unload in reverse order of the site programme, not in reverse order of the crate. The section needed first should come off first. Keep the remaining crates closed and off the ground. Leave the barrier in place until the switch room is dry. Damp air entering an open crate at dusk is the common mistake.

Final thoughts

Transport is part of the specification. Write the limits, the packing and the record into the order, and most disputes never happen.

Measure both ends before you book anything. Then match the shipping shape to the access you actually have.

Grid investment keeps rising, and the IEA tracks how much of it lands in places with difficult access.

Send the route, the access measurements and the delivery term you can accept. Giantele engineers return a packing plan, a restraint list and the documents that will travel with each unit.

Need a packing plan that matches your route?

Send the route, the access measurements and the delivery term you can accept. Giantele engineers return a packing plan, a restraint list and the documents that will travel with each unit.

Contact Giantele
GE

Giantele Engineering Team

Low voltage switchgear engineers at Zhejiang Zhegui Electric. We build IEC 61439 verified assemblies for factories, mines and utilities across Africa, the Middle East and Europe.

IEC 61439 CE ISO 9001

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