Switching 12kW?

[m4tty]

not making any sense that SL. in english

With a live to earth short on the 2.5mm swa will a) the cable melt before fuse blows or B) the 63a fuse operates and disconnects the circuit safely before the cable melts ?

So a or b mate ?

 

[Andy™]

isn't there a regulation not allowing you to downsize a cable in a circuit other than tiny distances to appliances (e.g. pendants) without fusing?

you can omit overload protection in certain circumstances, but i doubt it would have fault protection

 

[androidlee]

With a live to earth short on the 2.5mm swa will a) the cable melt before fuse blows or B) the 63a fuse operates and disconnects the circuit safely before the cable melts ?So a or b mate ?

who the **** is backing a 2.5 on 63a!

but if they did clearly the fuse would blow

 

[Andy™]

but if they did clearly the fuse would blow

are you sure? the fault current may not be enough to operate the breaker/fuse

 

[androidlee]

he said short. assuming a dead short

 

[Sidewinder]

Which end of the cable?

What is the circuit impedance to the point of the fault?

These will have a BIG bearing on whether the fuse "blows" or the cable is damaged, up to the point the fuse does "blow", which it will, but, which fuse and what collateral damage will be seen in the mean time?...

 

[Andy™]

he said short. assuming a dead short

even a dead short may not be capable of tripping the MCB / blowing fuse, but enough to melt the cable.

 

[androidlee]

it may yes i know

 

[batty]

Circuit design is what its all about it may yes is not a good thing.

 

[steptoe]

I feel sorry for the poor gardener that has just hit it with his fork!

 

[sellers]

off the 63A fuse onto a contactor, install a wireless switch to control the contactor, give the customer the keyfob and then he can switch on his tennis court lights from almost anywhere. Coohooool

*didnt read about the 2.5mm

Feed db in 10 or 16mm calcs depending, 4 lighting circuits off db, db switched by contactor.