ring with spurs

[Hawk]

How do you guys record a spur off a ring on a test certificate?

 

[gutterball]

Is it existing or are you adding it?

 

[Hawk]

Existing

 

[Pete999]

If it's existing does it comply to BS 7671? why do you need to record anything?

 

[Andy78]

Which specific part of the paperwork are you referring to ?

 

[Hawk]

Yes it complies with the regs. Changed a fuse box and have to do an EIC so on the schedule of test results I was just wondering how to record an existing spur off a ring circuit.

 

[Fox]

May have misunderstood but slightly confused - you wouldn't record it separately. Test the ring final circuit as normal and record these values

 

[Pete999]

Yes it complies with the regs. Changed a fuse box and have to do an EIC so on the schedule of test results I was just wondering how to record an existing spur off a ring circuit.

Hawk, not really sure what you are trying to record. you are bound to get odd Zs results when spurs are involved, as long as the ZS is within the max permissible I shouldn't worry

 

[Hawk]

I was thinking that a spur would give higher readings so was wondering if I should record these.

 

[Pete999]

I was thinking that a spur would give higher readings so was wondering if I should record these.

Take ZS at every socket outlet on the ring final, take the highest ZS as long as the reading is within the limits laid out in BS 7671 job done.

 

[Richard Burns]

Whilst testing Zs on the ring you get, say, 0.47Ω on each socket on the ring and readings of, say, 0.54Ω, 0.63Ω and 0.59Ω on the, say, three spurs then you would record the Zs of the ring as 0.63Ω, as this is the highest value. Your limit on a B32 is 1.1Ω at ambient so the circuit is fine.
The circuit details are just that details of the entire circuit, not parts of it.

 

[Hawk]

Ok. I have seen on other forums where people have said that say for instance a fused spur is taken off a ring for a lighting circuit. Then they would record the lighting circuit as a seperate circuit with 5amp 1361 as the fuse. Even though it is spurred off a ring.

 

[Pete999]

Ok. I have seen on other forums where people have said that say for instance a fused spur is taken off a ring for a lighting circuit. Then they would record the lighting circuit as a seperate circuit with 5amp 1361 as the fuse. Even though it is spurred off a ring.

Your original post didn't mention a fused spur, I think all the replies you have had are under the assumption that the spur you originally asked about was a 13amp socket outlet spurred from the ring final circuit, confusion reigns

 

[Deleted member 26818]

The people who suggest that a fused spur from a circuit would be a separate circuit are incorrect.
The origin of a circuit is at the DB/CU as stated in Appendix 15.

 

[Ross1]

To start with, I would mention the situation in the 'comments on the existing installation' section of the report.

The spur should be unswitched, with a 5A fuse also labeled for 5A fuse max. The as for the lighting circuit should then fall within the allowed As for fuse in spur.