MCB selection
- Thread starter alex28
- Start date
B
breezer
it isnt, its the other way round.
you could have a 6A MCB protecting a 10mm cable, a larger than expected cable is used to correct / allow for voltage drop.
Just becuse a cable is 10mm in this case does not mean to say you fit a large rated MCB
you could have a 6A MCB protecting a 10mm cable, a larger than expected cable is used to correct / allow for voltage drop.
Just becuse a cable is 10mm in this case does not mean to say you fit a large rated MCB
The rating of the MCB is selected to be equal or greater than the design current of the circuit it's going to protect. All derating factors are then applied against the rating of the MCB.
The size of the cable to be used is to be such that its tabulated current-carrying capacity (It) is not less than the value of rated current of the protective device adjusted as above.
The cable is then subjected to a volt-drop calculation.
The size of the cable to be used is to be such that its tabulated current-carrying capacity (It) is not less than the value of rated current of the protective device adjusted as above.
The cable is then subjected to a volt-drop calculation.
DIYnot Local
Staff member
If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.
Select the supplier or trade you require, enter your location to begin your search.
Are you a trade or supplier? You can create your listing free at DIYnot Local
