T
The Ghost
I noticed today when wiring up switch for shower the supply is in 6mm². The load cable is 10mm².
The shower rating is 10.8Kw. So we have a load that is 47a on 6mm² the OCPD being 40a 60898 type B. Interestingly on the new installation (rewire) they had recently the particular cct. on the schedule of test results it has the supply cable as 10mm², which it is not!
I am firstly, crap at visually identifying cables and would normally measure with a micrometer and calculate the size, not having (or being able to find it!) today I thought I would quietly go away with the bit of cable(s) and do so at home. Despite the foregoing I am 90% certain of the sizes. Before you ask, I am still looking for the ......... thing!
I am thinking (as people keep saying) you can overload a circuit where it is a fixed load, and that 47a is the max 6mm² can carry, The MCB being at 40a could only be a nuisance pro tem, so I do not see an immediate problem but this is not satisfactory longer term. As well they will never have it on full load as I ran it at full load for 10 mins you can't hold your hand under it!
I hesitate to steam in as they have just had a rewire and I want to be absolutely sure of my facts before I issue this observation to the client as there will no doubt be quite a furore when the proverbial hits the fan!
Soooo...what do you think? if you bothered to read this far. And if you did you get a free guardian angel til you wear it out!
The shower rating is 10.8Kw. So we have a load that is 47a on 6mm² the OCPD being 40a 60898 type B. Interestingly on the new installation (rewire) they had recently the particular cct. on the schedule of test results it has the supply cable as 10mm², which it is not!
I am firstly, crap at visually identifying cables and would normally measure with a micrometer and calculate the size, not having (or being able to find it!) today I thought I would quietly go away with the bit of cable(s) and do so at home. Despite the foregoing I am 90% certain of the sizes. Before you ask, I am still looking for the ......... thing!
I am thinking (as people keep saying) you can overload a circuit where it is a fixed load, and that 47a is the max 6mm² can carry, The MCB being at 40a could only be a nuisance pro tem, so I do not see an immediate problem but this is not satisfactory longer term. As well they will never have it on full load as I ran it at full load for 10 mins you can't hold your hand under it!
I hesitate to steam in as they have just had a rewire and I want to be absolutely sure of my facts before I issue this observation to the client as there will no doubt be quite a furore when the proverbial hits the fan!
Soooo...what do you think? if you bothered to read this far. And if you did you get a free guardian angel til you wear it out!
