Discuss Would you code a 60 amp main switch been fed from a 100 amp BS1361 in the UK Electrical Forum area at ElectriciansForums.net
I carried out a EICR and the main switch for the consumer unit is only rated at 60 amps and the main supply fuse is a BS1361 rated at 100 amps.
Im thinking this should be a C2, what are your thoughts please.
Many thanks
Martin
How do you know it's 100 amps , very rare to get a domestic fuse at that rating normally 60 or 80 amps
It's a shop and I had to pull the fuse to change the main board and this board is Economy 7.
What is the potential danger you have identified?
If you have changed the board/ cu it will be 100amp anyway.?
I was thinking the potential danger is the switching capacity isn't high enough in case of a fault.
Haven't changed this board. I want to change it but need to discuss it with the owner but he doesn't like spending money.
That's not a danger, that is a fact about the inadequacy of the equipment.
What situation can you imagine where the main switch will be required to break fault current?
What is the total load on the board? Is it a fixed load or variable?
There are thousands of cu's out there with 60 amp dp switches backed by 100amp service fuse.
So I should code it as a C3 improvement recommended.
There a four 3kw storage heaters on this board. So a load of 52 amps been drawn.
So the load is under the 60 amp rating of the main switch.
I see your thinking now, so I won't code this.
Sometimes I need to stand back and look at what I'm seeing and thinking from a different angle.
Thank you for your advice.
Martin
Reply to Would you code a 60 amp main switch been fed from a 100 amp BS1361 in the UK Electrical Forum area at ElectriciansForums.net
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