Breakers & Cable Sizes

[hpmuk]

Evening all,

Currently studying Electrical, quick question.

Is there a page in the onsite guide which tells you the minimum size per breakers ??

Thanks in advance

 

[telectrix]

not exactly. the rating of the breaker must be less than the ccc of the cable. e'g if your cable max. amps is 9A, you would fit a 6A breaker.

 

[Darkwood]

The minimum cable size should always have a higher CCC than the circuit protection device, then the cable size itself is subject to cable calcs to determine its required csa.

To Note! there are a few excemption in the regs where this is not the case but overall this is the rule.