Earth and Supply Two Questions

[Pat Tester]

[FONT=Arial, sans-serif]On a barn conversion for a client fitted 3 way garage c/u with rcbo's to supply 16 & 30 amp sockets for site supply. This is in a GRP box supplied by 3 phase supply from EDF. They required an earth rod to be put in to connect up to meter. Client now wants supply routed into basement. Questions: Will EDF be happy to extend the swa from[/FONT]
[FONT=Arial, sans-serif]transformer about 200 yards away into basement and put meter down there ? Would it be better to continue with external meter box and for me to run supply into basement and fit fused 3 phase isolator down there ?

Would you run 25mm tails in Conduit or use swa into basement about 15 m max
[/FONT]

[FONT=Arial, sans-serif]Another question: EDF have stated that 'PME will be provided 0.35 ohm so TN-C-S can be used if appropriate.' In 'area's of special risk' it is unlikely you can meet bonding requirements, so a TT system should be employed, and not to utilise the PME terminal. All circuits excluding Fire alarm will be on RCBO's. [/FONT]
[FONT=Arial, sans-serif]In what instance would I need to use an earth rod and not the PME ?[/FONT]
[FONT=Arial, sans-serif]As stated transformer is only 200 yards from supply.[/FONT]


[FONT=Arial, sans-serif]Thanks in advance.[/FONT]

 

[Shakey]

[FONT=Arial, sans-serif]On a barn conversion for a client fitted 3 way garage c/u with rcbo's to supply 16 & 30 amp sockets for site supply. This is in a GRP box supplied by 3 phase supply from EDF. They required an earth rod to be put in to connect up to meter. Client now wants supply routed into basement. Questions: Will EDF be happy to extend the swa from[/FONT]
[FONT=Arial, sans-serif]transformer about 200 yards away into basement and put meter down there ? Would it be better to continue with external meter box and for me to run supply into basement and fit fused 3 phase isolator down there ? [/FONT]

[FONT=Arial, sans-serif]Would you run 25mm tails in Conduit or use swa into basement about 15 m max[/FONT]


[FONT=Arial, sans-serif]Another question: EDF have stated that 'PME will be provided 0.35 ohm so TN-C-S can be used if appropriate.' In 'area's of special risk' it is unlikely you can meet bonding requirements, so a TT system should be employed, and not to utilise the PME terminal. All circuits excluding Fire alarm will be on RCBO's. [/FONT]
[FONT=Arial, sans-serif]In what instance would I need to use an earth rod and not the PME ?[/FONT]
[FONT=Arial, sans-serif]As stated transformer is only 200 yards from supply.[/FONT]


[FONT=Arial, sans-serif]Thanks in advance.[/FONT]

well, anywhere where it not fixed for a start

Look at the exclusions from using PME in BS7671:2008, all quoting the ESQCR's:

caravans
construction sites (except fixed building such as canteens)
marinas
mobile/transportable units

etc etc