What are the regs regarding the size of a cable feeding a fuse. Does it have to be large enough to be protected by the suuply fuses regardless of distance?
For example. Imagine a DB fed from a 100A fused supply. I need to fit a 20A fused switch at the side of the DB. There are no spare ways to connect to and I have to go on the live cables coming into the DB. There isn't enough room to get another 25mm cable into the terminal. Am I allowed to use say a 6mm to feed the new fused switch, which is approximately a meter away.
I've always tried to use the same size cable but I have a project coming up where this is a problem. I've looked through the 16th edition with no success.
For example. Imagine a DB fed from a 100A fused supply. I need to fit a 20A fused switch at the side of the DB. There are no spare ways to connect to and I have to go on the live cables coming into the DB. There isn't enough room to get another 25mm cable into the terminal. Am I allowed to use say a 6mm to feed the new fused switch, which is approximately a meter away.
I've always tried to use the same size cable but I have a project coming up where this is a problem. I've looked through the 16th edition with no success.