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you can export on a TNS SYSTEM IF TNCS TT ONLY OPTION
Surreal man ........................right on
Discuss A good guide For 'exported PME' and outbuildings! in the Australia area at ElectriciansForums.net
you can export on a TNS SYSTEM IF TNCS TT ONLY OPTION
Surreal man ........................right on
The last guidance on high protective conductor current was published in 2005 and even Guidance Note 8 has still not been revised to reflect 17th edition changes.
Hi, great thread - quick question... I'm installing power and light to a workroom in the back of a detached barn. Supply is off a spare way in the house and will feed a small consumer unit in the barn. The barn cu will have 30ma RCDs so my question is: Am I right to use a 100ma RCBO at the house so the whole thing doesn't automatically trip?
Ah, just noticed all the other replies, sorry guys, my first time here. Yes I am an electrician, qualified 2yrs ago but this job isn't my usual bag. Yes the cable does require RCD protection as it will be supplying power for outdoor use. The installation in the barn is entirely fitted in conduit.
im confuzled here wat is ment by export PME as in u can not take an earth from the main CU? u have to add a rod?
Thanks, but some of us have been taught that the DNO will not accept that on a TNC-S system. I am not trying to be contentious here but wonder where that myth came from.
From bias lectures that don't like PME earthing!!
What another cracking thread. So in summary so I can go forward,
1) We can export if practicable, if not TT it with all the usual requirements.
2)If we do export then a 10mm Main bonding cable must be provided, if services enter the location
3) If the CSA of the supply cable is <10mm we must provide a separate Main bonding conductor of 10mm
4)If the supply cable CPC CSA is > 10mm or + we can use said CPC as our 10mm main bond
Have I missed anything ?
My understanding from gn8 IS your exported bonding coductor size is the same as you bonding conductors for your main installation so if your main bonding is 50mm then your bonding to your outbuilding/shed will be 50mm even if your supply conductor size is only 16mm(to the out building)
Reply to A good guide For 'exported PME' and outbuildings! in the Australia area at ElectriciansForums.net
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