submain and DNO

[musicspark]

can someone tell me how this works?

A 16mm T&E submain from a house to an outbuilding is on it's own switch with 50a breaker, mounted next to the CU in the house and has it's own meter in the outbuilding.

The installation is TNS. and the tails from the incoming Disappear behind the plywood mounting board, come out on the other side of the door at the meter, and finally back behind the plaster and into the CU.

Here's the rub, the supply end of the T&E submain also disappears behind the plaster and is connected independently of the CU. Whether this is before the meter or after is impossible to tell without tearing up carpets, floorboards, lathe etc

this leads me to three questions

1. What kind of joint would be permissible (hidden like that) ?

2.Would it be safe to assume that the joint is between main fuse meter - bearing in mind that the submain has it's own meter in the outbuilding?

3.What would have been procedure regarding this arrangement with the DNO ( both for connection and future meter reading)?

 

[Andy™]

T&E submain would indicate private supply & meter. the outhouse would be connected to the load side of first meter, so any power used at outbuilding would run through both meters. leccy board would only read the main meter, the owner would read both and charge accordingly.

hidden joints... if its a DIY attempt, id go with twist & tape.

if the joint is between fuse & meter, then the owner will be making all profit from leccy used at outbuilding

 

[musicspark]

[quote name='Andy

 

[Riggy]

Henleys should definitely be accessible.

Could be soldered and sleeved joints - though I've no idea why your man would do it.

What rating is the cut out fuse as a matter of interest?

Easiest way to check that the spur is after the meter: switch off CU incomer switch large load on sub-main see if incoming and sub-meters both register kWhs used

 

[musicspark]

Thanks for that, Riggy

I might have to move the main switch and breaker to make room on the board. If there is not enough slack on the 16mm I;ll have to start Lifting floors and breaking into walls to find the joint.

'Tis all a bit strange though; and I cant help feeling that it would have been better put on the board than behind the wall.