bs 1361 fuses service head

[Regs]

o.k. bs 1361 fuses have earth fault loop impedance times as follows
80A-0.40ohms
100A-0.29ohms
(yes based on 80% values, 5 secs distribution)

In a TNS you can goto a max 0.8ohms Ze
so even if you use the smallest rated fuse in your service head, 60A still max only 0.56ohms and your Ze was 0.8ohms (TNS) it would not hit the required 5sec time??

 

[Richard Burns]

The service head comes under the ESQCR not BS7671.

 

[Guest55]

regs needs to read the regs.
;-)

 

[Regs]

regs needs to read the regs.
;-)

Silly me ay.
When i start to suffer from insomnia ay

 

[Regs]

The service head comes under the ESQCR not BS7671.

ESQCR stands for?

 

[markc123]

ESQCR stands for?

Electrical Safety Quality and Continuity Regulations 2002