Bulk Workwear - Clothing Suppliers for the Whole Forum Network
This official sponsor may provide discounts for members

Discuss Garage Supply Questions in the Electrical Forum area at ElectriciansForums.net

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

Hi everyone.

I am currently wiring a garage that is not joined to the property, its about 12 meters at the bottom of the garden.

The house supply is PME. I have been told by my cps provider that I am not to extend the earth and I must TT the garage.

I have run 6mm twin and earth from a rcd protected 32 amp mcb in the main consumer unit, through the house (the garden is on the other side of the house), through an external wall into a wiska box, then connect up SWA, run underground to the garage into a small consumer unit. I have earthed the armour at the house side. In the garage I have terminated the SWA in a plastic box with a nylon gland, connected it to a short piece of 6mm t and e, run in conduit into the garage cu main switch.

Now my problems begin. As I stupidly ran twin and earth from the board (it was a lot easier and cheaper than getting SWA all the way through the house), I have to keep it RCD protected at the main board.

Obviously I then cannot put an RCD in the garage which is TT'd.

Is it allowed to keep the house end on an RCD and just have a main switch in the garage, even though the garage is TT'd?

Hope this makes sense. Any advice/criticism gratefully received.

Thank you
 
Test Meter - Forum Sponsors since 2007!
This official sponsor may provide discounts for members

telectrix

-
Mentor
Arms
Esteemed
it's OK< but a fault in the garage means going back to house to rest. is the T/E buried < 50mm in wall, or surface?
 

Baddegg

-
Arms
Supporter
Esteemed
Advent Win
Can you alter the house Cu to put the sub dB mcb so as it’s not covered by rcd? And then protect accordingly at the garage if you have to TT...
Making an assumption that the 6mm t&e is under the floor and not chased in a wall?
 
  • Thread Starter Thread Starter
  • #7
Thanks everyone. At the moment the t and e is running behind plinth/cupboards/ovens etc in kitchen, clipped direct.

The are no extraneous parts but the cps provider told me as its a concrete floor they want it tt'd
 

davesparks

-
Mentor
Arms
Esteemed
Thanks everyone. At the moment the t and e is running behind plinth/cupboards/ovens etc in kitchen, clipped direct.

The are no extraneous parts but the cps provider told me as its a concrete floor they want it tt'd
I sometimes think the NICEIC etc say this sort of thing just to see whether their members actually understand the science and regulations or if they just blindly do whatever they are told without thinking.
 
N

Nigel

I am all for helping each other but I do wonder what mess we are in where we have a qualified electrician that is unable to wire electric to a shed without scheme help and asking on a forum.

Op - do you have access to BS7671:2018? If so where have you looked so far?
 

DPG

-
Arms
Esteemed
Advent Win
I'd love to see them back the concrete floor idea up with a reg. number.
 
Aico 3000 Range
This official sponsor may provide discounts for members

Reply to Garage Supply Questions in the Electrical Forum area at ElectriciansForums.net

Wetroom Store - Network Wetroom Suppliers
This official sponsor may provide discounts for members
Top Bottom