Garage supply

[sparkyb]

When wiring a garage should i wire the mains cable into the trip side of the board to protect the cable going to the garage or should I come of the main switch side so that the trip is in the garage and if it blows only the garage will go off.
I was thinking the first way so that the cable is trip protected?


Thanks

 

[TPES]

Best would be to supply the garage in SWA, then there's no RCD required from the house, but an RCD or RCBO's to be used in the garage to protect the circuits

 

[malcolmsanford]

You have to protect the cable supplying the garage unless you can comply with the regulations in 433.2 for overload protection and 434 for fault protection.

I would imagine that it would be very difficult to do this, so yes you will need to provide protection for the supply cable

 

[telectrix]

you must have overcurrent protection for the cable at the house CU. RCD protection ( position of ) depends on the type of cable and the installation method. there is more than one way of doing this type of install, suggest you read some recent threads on the subject, where a lot of detail and info is available. come back with some ideas of how you plan to do it .e.g. cable size and type, MCB ratings etc.

 

[sparkyb]

Well i already have it wired in 6mm hi tuff also protected in conduit along the driveway. I have came of the trip side in the house to protect the cable and just used a main switch in the garage with 32 mcb for sockets and 6 for lights. The client was wondering why the trip was going in the house and I explained to him that it is in there for to protect the cable. Could another trip be used in the garage and if so would this trip first if a fault occured rather than the one in the house?

 

[telectrix]

how are the garage sockets wired, ring or radial, cable size? do you have a non-RCD way available in the houseCU. do not fit additional RCD as you will have 2 RCDs in series with no discrimination, so in the event of a fault, either will trip. secondly, you need to find out what is causing the tripping. is it the garage or something in the house?

 

[mickys86]

IMO I would've put an isolator from the main supply, I would've ran SWA cable to a C/U in the garage and had it protected by an rcd in the garage. I would've then had a radial for the sockets on a 20A mcb and a 6A radial for the lights. This would've have met all current legislations and would have looked good too.

Correct me if I'm wrong because I'm only the apprentice

 

[telectrix]

suggest you "access" the screwfix forum.

 

[Electro-tech]

What Type of Supply, earthing arrangement? If TNCS - I would advise not to export PME.

 

[telectrix]

What Type of Supply, earthing arrangement? If TNCS - I would advise not to export PME.

why not? it's not a caravan or marina.

 

[mickys86]

What Type of Supply, earthing arrangement? If TNCS - I would advise not to export PME.

Even then, wouldn't it be acceptable to use a separate earth stake?

Remember I'm only the apprentice! 

 

[i=p/u]

you can export china to england so you can eport earth from the house

 

[Hawk81]

What Type of Supply, earthing arrangement? If TNCS - I would advise not to export PME.

Oh here we go again! It must be at least 2 days since someone came out with this rubish so we were due it again. Never gets old!!

 

[Electro-tech]

Oh here we go again! It must be at least 2 days since someone came out with this rubish so we were due it again. Never gets old!!

There are a number of respected highly qualified Engineers among these forums that agree with not exporting PME with whom I tend to agree.IQELECTRICAL has posted a guide in sticky posts, exporting PME. I wont bore anybody further as most would know the reasons why!

 

[Electricalserv]

I would like to know the reasons why people are so against exporting earths to outbuildings on tnc-s.