New meter installation checklist

[Andrew Mawson]

At last got a date for EDF to install meters to my barn, which is a couple of days after they are installing the overhead (so TT) 3 phase supply. Electrical installation has been tested and certified by a NICEIC sparks. Meter box has been installed on the outside wall with tails entering it. Cross bonding is in place, as is an earth from a huge earth spike. Anything else needed???? I remember coming across an EDF document (by Googling) detailing common reasons for refusing to connect but now cannot re-find it!

AWEM

[Andrew Gabriel]

Overhead doesn't necessarily imply TT. Some overhead supply networks are suitable for TN-C-S. If yours is, I would get them to present you with the earthing terminal from it (even if you don't decide to use it immediately).

Tea, lots of sugar, nice biscuits or home made cakes. Comes in very useful if you need to blag something off their van which you were supposed to provide!

[Martin Carroll]

In article , Andrew Gabriel writes

Yeah, they came through the village where I am doing the renovation last year replacing all the overhead cables. When the new meter was installed later that year I was told that it was suitable for TN-C-S.

Cheers

Martin

[YAPH]

The meter or the supply is suitable for TN-C-S? Meters are suitable for any supply, it's the supply cable that either does or doesn't have an earth. If it does it's either separate: TN-S, or using the neutral: TN-C, which is then split out in the supplier's "head" within the consumer's premises into a separate earth making TN-C-S. In the case of an overhead supply I suppose they connect the neutral to earth (as in the brown stuff we stand on) at various intervals along the supply cable run.

[Martin Carroll]

Sorry, lazy typing! I meant the supply - not the metre.

Yes, I believe that they do earth every few poles. In fact when the meter was first moved to a temporary position earlier in the year the engineers said that theoretically the supply was suitable for TN-C-S but that they didn't recommend it at that time. That was prior to the new cabling in the village.

[Andrew Mawson]

Gabriel

renovation last

cable run.

Well if the neutral is earthed at any point on this feed, it'll pretty certainly be at the pole that will supply me, as it's infact an 'H pole' pair with a darn great 11KV to 415v transformer sat on it. Close to the base of it is where my wife's greenhouse is, and before we levelled the ground for it I got EDF to test for cables - during the levelling we found the stubbs of a previous H pole, and the earth plate from the old set up! (no definately NOT attached to the current set up!!!)

AWEM