T
The Ghost
Yeh that makes sense, OP did say that.Fit a switch fuse disconnector.
Discuss PME head , builder forgot earth cable , 100amp 3phase supply , 10 bedroom house , 10 bedroom house in the The Welcome Forum area at ElectriciansForums.net
Yeh that makes sense, OP did say that.Fit a switch fuse disconnector.
Well if it's in the regs, then it's in black and white....just seems maddnes having a good earth at the DNO cutout, then at the DB end ditching it and then put in earth rod. Again , the University has several of its own substations with massive section boards that feed other large buildings (so technically the substation is the DNO supply) so then there'll be say 3 or 4 300mm2 SWA cables go out to feed other buildings, no separate cpc, then when they enter the building, an earth conductor is took off the armour to an earth bar and then from that you'll have a main protective conductor to the buildings section board, and protective earthing conductors to other services.I think this comes from Reg 543.4.1
The armour of those cables may be adequate to support bonding.Well if it's in the regs, then it's in black and white....just seems maddnes having a good earth at the DNO cutout, then at the DB end ditching it and then put in earth rod. Again , the University has several of its own substations with massive section boards that feed other large buildings (so technically the substation is the DNO supply) so then there'll be say 3 or 4 300mm2 SWA cables go out to feed other buildings, no separate cpc, then when they enter the building, an earth conductor is took off the armour to an earth bar and then from that you'll have a main protective conductor to the buildings section board, and protective earthing conductors to other services.
Ah so smaller SWA cables may not be suitable for that. Funnily the cables I've seen used in this way were much bigger that 35mm2, 50mm upwards if I remember correctly.The armour of those cables may be adequate to support bonding.
Well I suggest you get a pet rat and train it to run through drain pipes with string tied to it, put it through your duct, then tie a rope to the string, then use rope to pull in earth cable.....job donethanks for comments guys , i need all phases as massive house with a lift and various kitchens with big appliances etc , but i guess the main switch being 300ma rcd then me using 30ma rcbo units is the way , there is a 6 inch duct howeve its not a straight route and they didnt pull in a draw wire just the cable (bless them )
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