New circuits.

[joehat]

Hi all

I'm. Installing new circuits into a metal db with 10mm twin and earth as the tails into the main switch, so I can only assume their is a submain but my issue is the garage it's choca and we think it's where the main fuse is, would anyone be happy to put lim in this situation with the fuse ect/submain , as I am only from the house db adding circuits?

As in I can't put any details in as the main switch or submain board..can this be lims as I can't get to any of this?

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[joehat]

That doesn't change the rules, LIM is still not an available option for an EIC! The only options are pass or not applicable, you cannot have a fail, limitation, further investigation or not verified on an EIC


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So if you can't see what you out for main fuse? Not applicable ?

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[sparky1508]

It's always applicable as far as I'm aware because as already stated you need to know ifthe existing installation is adequate for the new circuit.

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[sparky1508]

Well how can you determine what fuse it is without taking the fuse out? Which your not aloud to do???

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Fuse rating and type should be on the cover if it's still legible or get it by enquiry.

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[7029 dave]

Fuse rating and type should be on the cover if it's still legible or get it by enquiry.

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Quite right, it will be stated on the fuse holder, and if not for any reason,a call to the DNO will quickly give you the answer.

 

[ruston]

I quite often bow down to your, and some other knowledgeable posters, wisdom on here Dave. But slightly sort of disagree with your post above. I recently came across a poor TNS earth connection which the DNO was promptly informed about. They came out within an hour, and stated that as all ccts were now RCD protected, it was not an emergency, and they needed a jointer anyway as they are going to have to dig outside. Personally I thought the sheath looked pretty good for renewal of the TNS, but what do I know! With a pair of long nosed gently holding the DNO clamp in place the Ze was good ~ 0.4 ohms or so. Without the long nosed it was around 70 ohms due to the loose clamp.

I thought the DNOs response was a bad one, and was not happy with it so I put in a temporary rod to get a high, but at least stable earth path.

On the EIC I did not put NA down in the earthing arrangements section, instead I made a note to refer to the comments on existing installation section as I felt it was relevant. Yes it could have been simply mentioned in a cover note (and it was) but felt a mention on the EIC was OK too.

OK, what I did may bit follow guidelines strictly, but I can live with it!

I had one similar to that a few years ago , it was sparking under test.
I called the DNO (probably the same as yours.)they were there within half an hour and fitted a constant pressure clamp. Just a difference in people lol.

 

[davesparks]

So if you can't see what you out for main fuse? Not applicable ?

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How do you know that you can't see what the fuse is if you haven't even looked at the cutout? If it's clearly labelled on the cutout then the net person to look at your EIC is quite possibly going to dismiss you as a cowboy.

The regulations are pretty clear, you get the information either by enquiry or by looking at it.

Unfortunately this does fall apart a bit when the DNO haven't got a clue, but at least you can honestly record this on the EIC than just not bothering to start with.

Plus as a mentioned earlier there is more to it than just the fuse size. What if there is a nice 16mm earthing conductor at the CU which then just connects to an old 3 strand bare conductor via a floating connector block at the head?


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[davesparks]

Quite right, it will be stated on the fuse holder, and if not for any reason,a call to the DNO will quickly give you the answer.

Unfortunately a quick call to the DNO for a domestic supply rarely gives a quick answer, other than them not having a clue. Sadly their records aren't exactly great for the older unlabelled cutouts !


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