I
Inteificio
On a distribution board last week in a farm house, I saw 2 core 4mm SWA with the sheath terminated by having a couple of strands in a terminal block.
A photo would save a thousand words, but I found out on that day that my camera phone is not waterproof =-(
The other sparky on site said it is fine if the Zs is in, which I accepted at the time.
Then I got thinking, the Zs will make sure the fuse trips, but how can you guarantee conductor safety while the fuse is tripping?
We had a similar issue in our factory where a spark proved that a distribution circuit would blow in 4s, within the limit. However I pointed out the wires would be melting the insulation after 1s.
I can do the calcs to prove how hot that conductor will get, but that is not sparky level maths and I know the guy who installed it won't be able to do that.
So my question is:
When is it ever safe to terminate only a couple of strands of the armouring on SWA when it is being used as the CPC.
This is quite important as I am going to be politely confronting the guy, and I don't want to risk causing offence if I am wrong. I will be the first to admit domestic is not my speciality.
A photo would save a thousand words, but I found out on that day that my camera phone is not waterproof =-(
The other sparky on site said it is fine if the Zs is in, which I accepted at the time.
Then I got thinking, the Zs will make sure the fuse trips, but how can you guarantee conductor safety while the fuse is tripping?
We had a similar issue in our factory where a spark proved that a distribution circuit would blow in 4s, within the limit. However I pointed out the wires would be melting the insulation after 1s.
I can do the calcs to prove how hot that conductor will get, but that is not sparky level maths and I know the guy who installed it won't be able to do that.
So my question is:
When is it ever safe to terminate only a couple of strands of the armouring on SWA when it is being used as the CPC.
This is quite important as I am going to be politely confronting the guy, and I don't want to risk causing offence if I am wrong. I will be the first to admit domestic is not my speciality.
