ring extension.

[amckay]

If a ring final circuit is to be extended what would be the appropriate cert to issue? I was thinking it to be a MWC but I'm not sure if it should be an EIC.
I think it should be a MWC as its not a new circuit, just slightly bigger/longer but I'm not sure and my regs book is on site so can't refer to it.
Thanks

 

[SparkyJoe]

If your only modifying 1 circuit use a minor works

 

[Octopus]

Extending a ring and issueing an EIC is well OTT in my mind.

A MWC asks all the right questions so crack on!

 

[Simonslimline]

If a ring final circuit is to be extended what would be the appropriate cert to issue? I was thinking it to be a MWC but I'm not sure if it should be an EIC.
I think it should be a MWC as its not a new circuit, just slightly bigger/longer but I'm not sure and my regs book is on site so can't refer to it.
Thanks

This is how it is worded in BS7671.


The minor works certificate is intended to be used for additions and alterations to an installation that do not extend to the provision of a new circuit. Examples include the addition of socket-outlets or lighting points to an existing circuit, the relocation of a light switch etc. This certificate may also be used for the replacement of equipment such as accessories or luminaires, but not for the replacement of distribution boards or similar items. Appropriate inspection and testing , however, should always be carried out irrespective of the extent of the work undertaken.

 

[lennyallover]

If a ring final circuit is to be extended what would be the appropriate cert to issue? I was thinking it to be a MWC but I'm not sure if it should be an EIC.
I think it should be a MWC as its not a new circuit, just slightly bigger/longer but I'm not sure and my regs book is on site so can't refer to it.
Thanks

it depends on how many points and how much actual installation is involved, a MWC is acceptable provided the new continuity of ring, R1 + R2, and Zs are recorded. If you're extending the rmso
by 20 points installing new conduit , trunking, and 30 metres of cable, then MWC is probably not the way to go

 

[trev]

If you're extending the rmso
by 20 points installing new conduit , trunking, and 30 metres of cable, then MWC is probably not the way to go

Considering that Simon has quoted direct from the regs what are you basing that statement on?
At what point are you going to change from a Minor works to an EIC?
Not having a go at you, just wondering what your thinking is behind this.

 

[Pete999]

Considering that Simon has quoted direct from the regs what are you basing that statement on?
At what point are you going to change from a Minor works to an EIC?
Not having a go at you, just wondering what your thinking is behind this.

Just got back in, can't believe some of the carp on this, modifying a circuit is what the OP is quoted to do MNW certifate, Trev makes a good point, Simon has quoted the Regs, so like Trev I can't for the life of me understand your reasoning Lenny

 

[lennyallover]

just a little common sense, if it feels more work than a MWC it probably is. You are the electrician, ultimately the type of cert you produce for the work you've done is down to you. If you're comfortable with your decision to use a MWC (giving your an experienced and competent electrician) then it should be fine. If there's a nagging doubt in the back of your mind that an MWC isn't enough. it probably isn't

 

[trev]

There's no doubt though Lenny, an extension or alteration to a circuit is on a minor works. A new circuit is an EIC
So as I asked earlier, at what point during this theoretical ring extension are you going to change your cert? adding 5 sockets? 7? 12?

 

[Octopus]

just a little common sense, if it feels more work than a MWC it probably is. You are the electrician, ultimately the type of cert you produce for the work you've done is down to you. If you're comfortable with your decision to use a MWC (giving your an experienced and competent electrician) then it should be fine. If there's a nagging doubt in the back of your mind that an MWC isn't enough. it probably isn't

Err...... So what isn't recorded on a MWC that you you think should be?

 

[lennyallover]

so you added a number of points (actual number irrelevant)to an existing cct, installed in conduit and trunking that you've just installed along a corridor through a wall into say a boiler room for attachment to the buildings BMS panel which will now control the circuit you've just extended. Still MWC?

 

[trev]

Why is the conduit and trunking relevant?
Is the BMS panel pre-existing or is it a new addition? If it's a new addition then fair enough, I'll be reaching for the EICs but if, for example, it's adding a dozen sockets in an office in dado trunking then it's a MWC

 

[davesparks]

Good grief, is it really that hard a concept to get your head round.

Alteration to 1 x existing circuit = MWC

The same amount of testing is carried out whichever certificate you use

 

[Pete999]

so you added a number of points (actual number irrelevant)to an existing cct, installed in conduit and trunking that you've just installed along a corridor through a wall into say a boiler room for attachment to the buildings BMS panel which will now control the circuit you've just extended. Still MWC?

I would have thought Kenny, that if you are installing a supply for a BMS panel then perhaps extending the RFC isn't the way to go. maybe you ought to think about running a dedicated supply, but yes it is still a MNW if you are doing your way i,e, extending the RFC regardless of how many sockets.

 

[amckay]

Thanks for your responses fellas.
Just for info its one double socket extending from RFC in (crappy) trunking for about 3meters max. And another in kitchen 2m max.
So a MWC it is.
Just out of curiosity, as I've never done the following before, would it still be appropriate to issue MWC for a spur of a ring?
Thanks for your input.