UK Circuit design for computer circuits.

[Brownie]

Hi Guys,

I'm currently designing an installation that will be used to configure multiple pieces of electronic equipment such as PC's, Servers, All in ones etc. Its going to be set up in bays such as the picture attached. With it being a full socket installation I was hoping for some guidance if I'm approaching the maximum demand calculations correctly with diversity. There are a lot of circuits as there will be a high amount of earth leakage from the equipment being used and IET suggesting to keep it less than 30% of the 30mA. I've attached a screenshot of the equipment being used. There is a possibility that all bays will be used at the same time with all the equipment plugged in and going. Any suggestions would be great. Thanks.

 

[James]

have you considered using rcd sockets?
that way you don't have to worry about cumulative earth leakage tripping rcd's
a faulty device wont take out all the others on test.

you may consider wiring the earth as a ring, even for radial circuits to ensure you have a robust system for dealing with high leakage currents.

 

[Brownie]

have you considered using rcd sockets?
that way you don't have to worry about cumulative earth leakage tripping rcd's
a faulty device wont take out all the others on test.

you may consider wiring the earth as a ring, even for radial circuits to ensure you have a robust system for dealing with high leakage currents.

Cheers for the reply James.
It did pass my mind but because it is a power circuit less than 32a doesn't the cable supplying the sockets have to be rcd protected as well? Regarding the high integrity earthing, the way it is designed at the moment is less than 10mA and the spec of future configurations will not be near that either so I believe it isn't required? It's more the diversity calculations and max demand I could do with a hand on, just to make sure I'm definetly doing it correctly.

 

[James]

In the U.K., depending on cable type and routing, an rcd may not be required