- Reaction score
- 644
Agree, usually a ctrl cable supply comes from elsewhere.like a BMS SYSTEM,if not a C.C supply should of been installed @ some point.Not at all,imagine f a fault developed at the point where the main cable enters the isolator/contactor. If the main cable is 25mm and the control cable is 2.5mm, there is a danger that the smaller cable could suffer "burn out". This could result in a fire!!
The control feed at this point should ideally be the same or at least 50% of the size of the main cable until it reaches the circuit breaker or fuse for the control circuit.
Of course ideally the cables of dissimilar size could be fed from a busbar system and bolted seperately, this would negate the problem.
Maybe a 10 amp C.C.