Bs3036 fuses and high fault current

[infinity]

I have recently carried out an EICR on an old building, one of the main DBs is an old Bs3036 board with 3 phases.

When testing Ze i measured 0.06 and a PFC of 3.8ka giving a measured value of 7.6ka (as its 3 phase)


Obviously the fault current is too high for the fuses, but can you take into account the suppliers fuse if a fault of such current were to occur? So the old MEM 3036 board wouldn't have to be upgraded?

Thanks

 

[Sintra]

Correct

 

[infinity]

Thank you sir

 

[Parker27]

I would agree with Sintra, but it would be wise, if you can to also check the characteristics of the supply fuses.

 

[BrianDB9]

Definitely ok to use suppliers fuse if its a HRC but if its 3036 ..... ?

 

[telectrix]

if a supplier's fuse is a 3036, you can get them to replace it FOC.

 

[gingerspark]

I have recently carried out an EICR on an old building, one of the main DBs is an old Bs3036 board with 3 phases.

When testing Ze i measured 0.06 and a PFC of 3.8ka giving a measured value of 7.6ka (as its 3 phase)


Obviously the fault current is too high for the fuses, but can you take into account the suppliers fuse if a fault of such current were to occur? So the old MEM 3036 board wouldn't have to be upgraded?

Thanks

The protective device must be able to withstand the fault current where it is installed. Bs 3036 are rated between 1 and 3 KA. I take it as worst case 1KA. If your readings are at DB then the board should be up graded. The suppliers fuse could be much bigger than the bs 3036 allowing high fault current to flow which could lead to fuse exploding.