Well there is, actually, but it needs a specialist and expensive bit of kit.
Maybe that means they check that none have blown.
Proteus BS5486 cartridge
- Thread starter diycooper
- Start date
Hi. I not sure where you think I do not know the difference between a fuse and a MCB ?
Ha ha fair enough. But I knew I was relating to a MCB . Don' know why I didn' write it.
Jolly good.
What is the circuit? What investigations have you done to verify that you can safely uprate it to 32A?
Are you planning to apply for Building Regulations approval?
What is the circuit? What investigations have you done to verify that you can safely uprate it to 32A?
Are you planning to apply for Building Regulations approval?
The cable size is 6mm. The run is about 5 meters long. Its is for a 7.5 kw shower. In all honesty I have a spark who is always busy but he will put it in . I was doing my own homework first. Honest answer no I was not intending to apply for building regulation approval !
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Unusual to have a 6mm² cable on a 16A breaker
The 16 amp MCB is irrelevant what cable it has . As that cable will not be connected as it was for a immersion heater. The 16 amp MCB will be getting changed for a 32 amp MCB. Then the 6mm shower cable took out the 45 amp fuse and wired into 32 amp MCB.
Circuit will then be a 32 Amp MCB on 6mm cable with a run of 5 meters with a 7.5 kw shower connected.
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If it's only a 5m run why not (dependant on cable routing) get a 401QEB and an 8.5kW shower. 9.5kW would also just be fine assuming calculating at 240vac.
A 7.5kW shower will just about get you wet and warm but it will not be a pleasant experience.
A 7.5kW shower will just about get you wet and warm but it will not be a pleasant experience.
401QEB MCBs for my board are £50.
Another option would be to remove the old 45 shower fuse unit which is seperate off the CU. And replace with a with a shower consumer unit with a 40 amp MCB and a RCD.
The current circuit for shower does not have a RCD on and council installed it . It has 10mm tails from CU.
Would the tails need upgrading to 25mm or 16mm if this was case as the main fuse I think is 100amp. Or is 10mm fine as it only running the shower unit ?
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TBH I have had a Triton &.5 KW shower in for years and it has always been hot enough in winter as long as you have the setting with 2 elements selected.
In that any cable where Ib ≤ In ≤ Iz is fine, and the Iz is very likely >> 16A.
But if you prefer..
It's unusual to use 6mm² cable for an immersion heater.
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And total waste of copper and money
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