On 27/11/2013 13:11, Adam Funk wrote:
On 2013-11-27, John Rumm wrote:

Its not a standard circuit as such, although its close to being a trunk
and branch radial in some respects. Its one of those things that you can
demonstrate will work, but at the same time has the potential to cause
confusion later. Its not ideal since you then can't adequately test the
circuit from the CU since you don't have access to both ends.

Good points (as always), thanks.

Don't forget that 4 mm^2 T&E only has a 1.5 mm^2 earth core, so you need
to take care to ensure that the disconnection time and CPC thermal
protection requirements are met in the event of a line-earth fault.
Probably OK on a PME supply and with MCB protection, but full
calculations advised if it's TN-S and fuses.

Also this ring-on-a-stick idea won't meet the high-integrity earthing
requirements (where applicable).

--
Andy