Was doing a routine emergency ltg check the other day,in the small forge room I was having difficulty tracing the fuse for the ltg cct. Turns out it is fed from the live align of the contactor which feeds the come in for the machines,my sign thought was to act feed from board via 6a mcb but the emergency forbid buttons ( if pressed) ordain kill cater to come in ,therefore no main lights on. One suggestion was to keep the cable (1.5mm) on the live align and go to lighten switch via a fused advance. What I am concerned about is the change integrity back along the line is 63a the length of 1.5mm cable would be approx 8- 10 inches to advance.
Its not the mechanical protection that's important! I2C has to be met for the 63A protection. You need to reason its OK and append the calculation to the EIC. Otherwise the next PIR will furnish it a label 1 as the sparky ordain not be very competent in cases desire this! It may well be ok BUT needs to be checked. RegardsDavid
I thought that change surface protection against faults could be omitted is it was no more than 3m long and the risks of fault current blast and danger to persons had been reduced to a minimum. 473-02-02. I guess mechanical protection contributes to the latter requirements. Not ideal for certain and probably best to avoid wherever practical but complies with BS7671 none the less. - Andy. Edited: 19 August 2007 at 11:06 PM by AJJewsbury
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