UK Sub main joining niceic advise Needed

[Viper22mike]

Joining niceic and doing a sub main to a garage off a tns earthing arrangement using 6mm Swa. The question is I have 25mm tails on 100a main fuse to a down rated dp isolator with a 63a fuse from there the swa. I'm filling in the eic for them to view do I put the 100a or 63a main fuse size in and 16mm main earth or 6mm for the circuit many thanks for the help

 

[Viper22mike]

Don't want to sound negative here but if you are trying to join the NICEIC you should know rudimentary cable sizing.

I've done cable sizing before but have been told for ages what to put. I asked the chap I worked for before I said I was going to see he said stick 63a in if its the lowest in box.... Should of looked to check its my own fault its on me. When I said I wanted to join niceic and now he doesn't talk I'm on my own. I thank you for your help I'll look for a 40a fuse for it

 

[Viper22mike]

I've done cable sizing before but have been told for ages what to put. I asked the chap I worked for before I said I was going to see he said stick 63a in if its the lowest in box.... Should of looked to check its my own fault its on me. When I said I wanted to join niceic and now he doesn't talk I'm on my own. I thank you for your help I'll look for a 40a fuse for it

I've done cable sizing before but have been told for ages what to put. I asked the chap I worked for before I said I was going to see he said stick 63a in if its the lowest in box.... Should of looked to check its my own fault its on me. When I said I wanted to join niceic and now he doesn't talk I'm on my own. I thank you for your help I'll look for a 40a fuse for it

53 and 44 3 core maybe I should select a lower rated fuse

Thanks for your help it's very much appreciated guys

 

[timhoward]

I've done cable sizing before but have been told for ages what to put. I asked the chap I worked for before I said I was going to see he said stick 63a in if its the lowest in box.... Should of looked to check its my own fault its on me. When I said I wanted to join niceic and now he doesn't talk I'm on my own. I thank you for your help I'll look for a 40a fuse for it

Hang around here for a bit, keep reading the regs book, and in no time you'll be able to outsmart most of the people coming to assess you (but never be too clever, they like to think they are experts!)
Main thing at the beginning is to be able show you know what you are doing with testing.

 

[Viper22mike]

Hang around here for a bit, keep reading the regs book, and in no time you'll be able to outsmart most of the people coming to assess you (but never be too clever, they like to think they are experts!)
Main thing at the beginning is to be able show you know what you are doing with testing.

Thanks for the help and thanks for the advice it's very much appreciated

 

[davesparks]

Yes. So the cable can carry 53A at most onerous point.

53A would be the tabulated value, not necessarily what the cable can carry.

Rating factors need to be allied which can either increase or decrease the tabulated value.

 

[davesparks]

Looking at the table from what I see 6mm clipped direct 62a and in the ground 53a is that what you have

You can't just look at the table, you need to do the cable size calculation to establish what size cable you need for the chosen OCPD.