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simonspark

Evening All,
Could one of you fine tradesmen, there's got to be one out there, help me out a bit here. I have been asked to install a ring circuit that is going to supply 17 computers in a school. I know that its going to be an IT install (separate earth terminals and all that) but what about the RCD situation? The regs state that the sockets should be protected by an RCD. But the natural leakage could well trip an RCD. I could split the circuit into two or more rings, but the logistics of doing such a thing are staggering. Trust me! Can I just put labels on each socket stating that they are for IT equipment only? And all wiring is going to be surface (nice!)
I am going to have to thankyou in advance, because the last time I tried such an action I failed.
Thanks
 
ok........ could you not run radials for these circuits? 2x 4mm Radials and run a 4mm Earth with each to comply with 543.7.1.2
i Would do 2 circuits and have 8 pcs and 9pcs per circuit. Protected by a 30mA RCBO.
 
Correct but 3.5 is probably slightly higher than what you will actually get i have seen installations designed for 7 pcs happily living with 10pcs. You can make it 3 circuits if you prefer.
 
And now I have to install 3 x 4mm twin and earths complete with 3 x 4mm single earths. And you should see all the data trunking that needs to be bridged! And the 18 way cu is full! And I cant lift the floors and the cornice is a decorative bugger about 18 inches down and the same across.
 
If your not qualified and competent you won’t have public liability insurance!

Leave the job alone!
 
I am qualified, 99.4 % on the 17th Easy exam (one wrong!!). And have done the amendment 2011. I am looking for an answer or should I say a get out clause where the works can be done without costing 2K! 2 million pound liability
 
If it is acceptable to mark up a non RCD protected socket with a label stating fridge/freezer only (taking into account of no flush wiring) why is it not the same for IT equipment.
 
The first thing you need to do is check with the Local Authority (assuming the installation is under their control) to see if there is a published specification covering this issue.

The last school installation that we did had a 'mini spec' stipulating RCD protection, high integrity earthing and a maximum of 6 'terminals' per ring final circuit.
 

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