Discuss RCD Test of SWA Cable in the Electrical Testing & PAT Testing Forum area at ElectriciansForums.net

Reaction score
13
Welcome to ElectriciansForums.net - The American Electrical Advice Forum
Head straight to the main forums to chat by click here:   American Electrical Advice Forum

Having a bit of a brain freeze moment.

I have a 2-core SWA cable running to an outbuilding. The sheath is used to earth this cable back to the consumer unit in the house which is TNC-S, while the outbuilding has its own earth electrode (ie it's TT) protecting its Consumer Unit. That's to say I've not exported to PME to the outbuilding as it's a long way from the main building. The SWA cable is thus protected from someone putting a shovel through it by the RCD in the main building (It's a single RCD which protects all the circuits).

All well and good, but, and don't ask, I've totally blanked how to test the RCD in the house to ensure a fault with the SWA cable will trip it. As I recall I just energise the MCB covering the SWA, connect my earth lead to the disconnected earth conductor which is connected to the sheath of the SWA cable and then the line lead to the top of the RCD (Line) and do the test, repeating for the neutral.

I know I don't have to do this as such, I could just test the RCD from anywhere in the main house for the paperwork, but it's for piece of mind really that everything connecting the house to the outbuilding has been done right, and it will trip the RCD in the main house under fault conditions of the SWA.
 

James

-
Mentor
Esteemed
Arms
Supporter
Patron
Reaction score
6,240
Would you not be better to omit the house rcd for the swa and use local rcd or RCBO’s for the outhouse circuits?
or even a 100mA unit if you can’t achieve discontinue times without.

and yes, to test rcd you could just attach leads to incoming supply to outhouse consumer unit.
 

Reply to RCD Test of SWA Cable in the Electrical Testing & PAT Testing Forum area at ElectriciansForums.net

Similar Threads

Hi Ive looked around and i cant see this particular scenario being discussed. I think i may have been a numpty, but bear with me. I have just...
Replies
14
Views
276
Done this loads of times before, but this situation is quite unique so bare with me. I've been asked to cable up an out building at a country...
Replies
5
Views
725
  • Question
Hi. I have a shed with its own small consumer unit connected by underground SWA to a connection box on the outside wall of the house. This in...
Replies
9
Views
264
All of the work described below will be completed by a qualified electrician, I am just curious and using the info for planning!! I am planning a...
Replies
13
Views
428
  • Question
As an adult learner, I have lots of theory but not enough practical experience so I'm hoping I can get some help here (not abuse). I'm trying to...
Replies
2
Views
902

New Posts (Please Reply)

Top