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Greetings
I work for a client who has recently negotiated a bigger supply from the supply authority, the client has agreed with Scottish power to have a larger transformer and feeder cable installed, my part of the works is to upgrade the existing switchgear to accomodate for the new supply.
The existing supply was three phase and neutral plus earth fused at 200 amp from a transformer on a pole, the new supply is from a transformer on the same pole as existing supply and will be fused at 315 amps three phase and neutral, however the supplier says they can not provide and earth because the building is metal, therefore now apparently we require an earth rod and a large three phase rcd, which will be a nighmare given the existing equipment etc , welding etc, one fault and the whole site goes off.
All other buildings we go to are metal but have incoming earths, is the decision not to supply an earth justified, i am failing to see how the original transformer supplied three phase n&e but not the new tranny, any thoughts please.
many Thanks in anticipation
I work for a client who has recently negotiated a bigger supply from the supply authority, the client has agreed with Scottish power to have a larger transformer and feeder cable installed, my part of the works is to upgrade the existing switchgear to accomodate for the new supply.
The existing supply was three phase and neutral plus earth fused at 200 amp from a transformer on a pole, the new supply is from a transformer on the same pole as existing supply and will be fused at 315 amps three phase and neutral, however the supplier says they can not provide and earth because the building is metal, therefore now apparently we require an earth rod and a large three phase rcd, which will be a nighmare given the existing equipment etc , welding etc, one fault and the whole site goes off.
All other buildings we go to are metal but have incoming earths, is the decision not to supply an earth justified, i am failing to see how the original transformer supplied three phase n&e but not the new tranny, any thoughts please.
many Thanks in anticipation