primary overcurrent protective device.

[m1ck_b87]

Morning all

Eicr asks for characteristics of primary overcurrent protective device which lets be honest sounds straight forward but what if you have 3 phases with 3 separate 300 amp 1361 which supplies a load of other 80 amp 1361 fuses which then supplies your single or 3 phase db which fuse would you use as the primary device.

 

[marcusone]

I would put the 300amp Bs1361. As this is the primary. It's also the origin of the system where you would measure Ze.

 

[sparkymalarky]

The suppliers overcurrent protective device (or DNO as you call it) details would go in here, which I would imagine are your 300Amp BS1361's. Primary Device = First Device.

 

[44ALLAN]

Primary is the clue mate.

 

[m1ck_b87]

Thanks all just needed to clear that up I can think straight now