Extending Meter Tails

[HandySparks]

I hate the DNO fuse to blow, most places I been to have an DP MCB between the meter and the CU this is all under 1 meter (easier the isolate the CU with out having to pull the DNO fuse)
as you may be extending the tails anyway best to just install an DP MCB and run the extended tails off that so any fault that happens from the CU to the meter/DNO fuse is protected by the DP MCB.

I really would not think about Not installing an DP MCB before extending the tails (its as easy to install a DP MCB then to just use an Block to join the tails to extend them with the added risk of blowing the DNO Fuse)

If your DNO has fitted at 40A/60A/100A fuse then your DP MCB should be rated at it or you be with out power until the DNO comes around to fit an new fuse and part with your money or customers money

Hi. I've not seen an MCB used as a stand-alone device installed in the tails before. Can you provide a link or photo of one of these DP MCBs that you are advocating? (Preferably installed as you describe.)

And what rating would you suggest using with a 100A DNO fuse?

By the way, are you an electrician and are you in the UK?

 

[leexgx]

the currant house here has that type installed here (DNO Fuse 100A > meter > DP MCB 100A > CU) there is to much junk in the way (wife) to get an picture of it

its quite standard in Warrington UK to see this type of set-up when an CU is replaced

most seem to install an 100A DP MCB even if the DNO fuse is lower then it not sure why

 

[HandySparks]

Why do you think it's an MCB, not an isolator?

A photo would be good, even if cluttered.

 

[sjm]

No idea, ...you tell me?? lol!!

Just putting "lol" doesn't stop your implication from being insulting.
I was merely passing on information gained from 3 sources.

The information supplied is from the Electrical Safety Council Website.
Q1.50
Is it permissible to install a consumer unit more than 3 m from the distributor’s service head?
Yes, in certain circumstances. Distributors generally accept a maximum of 3 m from the service head. Where the tails need to be longer, the distributor may require a means of isolation to be provided within 3 m of the service head. Any particular requirements should be ascertained in advance from the distributor.

 

[leexgx]

the CU has an 100A isolator but very sure its an MCB between the CU and the meter really there is a lot of junk where it is i be back in 2-3 hours got some work to do see if i can move it out

just from looking at it from the top it looks like an DP MCB, the DP MCB looks like size wise as what's in the Wynex CU MCBs, as the isolator in the CU is just an big red switch isolator, i look bit closer when i get back (you probably right its most likely an isolator thought)

 

[Engineer54]

No idea, ...you tell me?? lol!!

Just putting "lol" doesn't stop your implication from being insulting.
I was merely passing on information gained from 3 sources.

The information supplied is from the Electrical Safety Council Website.
Q1.50
Is it permissible to install a consumer unit more than 3 m from the distributor’s service head?
Yes, in certain circumstances. Distributors generally accept a maximum of 3 m from the service head. Where the tails need to be longer, the distributor may require a means of isolation to be provided within 3 m of the service head. Any particular requirements should be ascertained in advance from the distributor.

Listen, if i wanted to insult you, there would be no implication about it, you would have had no doubt you were being insulted!!

As for the other junk, i'll stick to how i have always done things in this situation, and how it was when i was trained and well beyond!! Likewise how every other experienced electrician here, would advise installing a fuse switch on extended tails!!