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Wiring a metal container

cydodimead
I have a job where the client wants some power and lighting in 2 containers in the yard of their unit. Conveniently there happen to be a couple of 16A single phase commando sockets (protected by RCBO's 16A 30mA) on the exterior wall of the unit a couple of metres from where the containers are located. Would I be right to treated the container as a Caravan? Supply to unit is TN-C-S (PME) so I don't want to export the PME earthing to the containers. I'm thinking the following to meet requirements.


1. Swap RCBO's for MCB's

2. Put 2 pole 30mA RCD in line (perfect bit of trunking on inside of building where I can put an enclosure with the RCD)

3. Small DB inside Container with MCB for twin 13A socket, and 2nd MCB for lights. All protected by double pole RCD. Earth from 16A socket on building not connected to container DB.

4. Earth stake from container DB through tarmac ground soil. Could I link bonding from one container to the other?


Having never wired a caravan pitch, caravan or container I just wanted to be sure I have read the regs correctly?
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    The two could and should share an earth if they can both be touched by a person with long arms.

    With a 16A supply, strictly  you do not really need the MCBs inside and I am not sure how you make them discriminate with the ones outside, but a small CU is a very handy place to marshall earths and provide a main switch.


    Comments about other earths nearby are key, you need to be aware of that. It may be safer to use the PME earth if the ground is covered in cement or tarmac, and if there are already PME earthed street lights or similar  within touching distance.
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  • 0
    The two could and should share an earth if they can both be touched by a person with long arms.

    With a 16A supply, strictly  you do not really need the MCBs inside and I am not sure how you make them discriminate with the ones outside, but a small CU is a very handy place to marshall earths and provide a main switch.


    Comments about other earths nearby are key, you need to be aware of that. It may be safer to use the PME earth if the ground is covered in cement or tarmac, and if there are already PME earthed street lights or similar  within touching distance.
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