New MCB's ???

[NoSparks]

Has anybody come across MCBs with ratings of 3A or 5A? If so what cable are they used to protect?

 

[Leesparkykent]

Ive heard of sparks wiring bathroom lighting and putting the circuit on a 3amp MCB because of the BS manufactures instructions stating the fan has to be protected by 3amp. Saves putting a FCU next to fan isolator. The whole 3amp and fan thing is another debate though.

 

[Marvo]

Ive heard of sparks wiring bathroom lighting and putting the circuit on a 3amp MCB because of the BS manufactures instructions.....

Lol, kinda makes sense though.

Usually 3A or 5A MCB's would be found in control panels to protect the thinner control wiring.

 

[Darkwood]

Yep - I do a lot of control panels and you would be surprised the ratings available 1A, 2A, 3A, 4A etc etc brand dependent.

 

[ian.settle1]

Have a look at this

Eaton?s 6kA Miniature Circuit Breakers ? Eaton UK ? Power distribution or this

10kA/15kA Miniature Circuit Breakers ? Eaton UK ? Power distribution

Don't forget that MCBs can be used in control cabinets so a low current rating might be wanted just for the control circuitary

 

[NoSparks]

Thanks for those replies. I don't personally work on control panels and hence have never come across them, but I was amused to see them (highlighted by errata sheet) the in the new OSG.