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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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    My thinking is that a yard where work activities may or will take place will probably have extension leads running all over the place.


    There could easily be an extension lead from the main building or the external sockets mounted on it which are connected to the PME earth system running into the steel cabins which are TT earthed, or maybe even vice versa.


    St the very least I would be looking at making the existing external sockets TT, but if they are mounted on a steel clad building or there’s air conditioning units or the like within reach it needs a bit more consideration. 


    I posted a picture of a TT EV charging point on a steel building the other week I was stood looking at , I will find it again.


    Andy B
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  • 0
    My thinking is that a yard where work activities may or will take place will probably have extension leads running all over the place.


    There could easily be an extension lead from the main building or the external sockets mounted on it which are connected to the PME earth system running into the steel cabins which are TT earthed, or maybe even vice versa.


    St the very least I would be looking at making the existing external sockets TT, but if they are mounted on a steel clad building or there’s air conditioning units or the like within reach it needs a bit more consideration. 


    I posted a picture of a TT EV charging point on a steel building the other week I was stood looking at , I will find it again.


    Andy B
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