Minor works R1+R2 measurement

[gazdkw82]

I think I may have asked this question a while ago but not sure on what the answer was and it's come up again at our monthly tool box talk.

When doing a Minor works for an additional spurred socket or extra light fitting on a circuit, should the R1+R2 measurement be taken from the protective device or the socket/fitting you have spurred from?

 

[telectrix]

the R1+ R2 should be for the whole circuit.i.e. from the OCPD in the DB to the furthest point.

 

[gazdkw82]

Is there any literature (regs/onsite guide) to support this?

 

[Deleted member 26818]

Is there any literature (regs/onsite guide) to support this?

Why would you be recording the R1+R2?
What is the purpose behind it?

 

[gazdkw82]

Why would you be recording the R1+R2?
What is the purpose behind it?

It's part of the minor works testing schedule on our guardian minor works

 

[Pete999]

Why would you be recording the R1+R2?
What is the purpose behind it?

You nee to ensure that the circuit you are adding, altering etc is correct, if the RFC you are adding a spur to, and the R1+R2 was suspect, indicating that maybe it is not wired correctly, then adding a new spur may not be the best option, that's how I read it Spin.

 

[gazdkw82]

Wouldnt it be easier to just do a Zs? If that complies, then the R1+R2 value must be acceptable?

 

[westward10]

18th Ed MWC asks for continuity readings as well as Zs.

 

[Pete999]

18th Ed MWC asks for continuity readings as well as Zs.

Agree Mate, but the question the OP posed, or at least I think this what he is asking, is would you need to take continuity readings of just the new cable installed, or the continuity of the new and existing circuit, my thoughts are post 6.

 

[gazdkw82]

Exactly that Pete.

 

[Nigel]

It's part of the minor works testing schedule on our guardian minor works

I think Spin is trying to point you in the direction of finding the answer yourself.

What is the reason we carry out R1+R2 testing?

 

[Nigel]

You nee to ensure that the circuit you are adding, altering etc is correct, if the RFC you are adding a spur to, and the R1+R2 was suspect, indicating that maybe it is not wired correctly, then adding a new spur may not be the best option, that's how I read it Spin.

I think Spin knows the answer but is trying to help the Trainee.

 

[Nigel]

Exactly that Pete.

What is the purpose of R1+R2 testing?

 

[gazdkw82]

To confirm continuity and polarity

 

[Deleted member 26818]

It's part of the minor works testing schedule on our guardian minor works

Ok, if it’s just to fill out the form, then you should do what the form asks, which is to record the value of R1+R2 for the circuit which has been altered or extended.