Fuse Downgrading

[jdd]

Is it acceptable to leave a 2 core 10mm2 MICC cable supplying an upstairs flat on a 100A suppliers fuse? (Maxing demand is acceptable and disconnection times are within tolerance.)

 

[mogga]

what your asking is "I have a dod of 10mm micc is it ok to throw this in without the required switchfuse?"

 

[jdd]

No, existing installation. Just wondering when there is no space in the meter box for a switch fuse. I come across this every so often when carrying out periodics.

 

[rich.250]

NO. Without fusing down, you would exceed 3m which the supplier will say is the max unfused.

Also regs say max of 3m back fusing.

 

[jdd]

Any idea how I would code this when carrying out the new eicr?

 

[Deleted member 26818]

I would comment something along the lines of: Inadequate current-carrying capacity of distribution circuit as per Regulation BS7671 523.2 Code C2

 

[jdd]

Thanks for advice.

 

[mechelec]

Is the pyro the property of the DNO. I know around here many flats were serviced by DNO in pyro. I have had faults on these on occasions and DNO changed them for hybrid concentric.

 

[shocking_eg]

cant they just down rate th 100A cut out to say a 60A ?