Cable for 12kw electric boiler
- Thread starter Mike2007
- Start date
At least 16mm²
The current will be around 55 amps.
Is this a new addition to the property ? If so have you confirmed the supply ( main fuse, meter etc etc ) can cope with an extra 55 amps.
The current will be around 55 amps.
Is this a new addition to the property ? If so have you confirmed the supply ( main fuse, meter etc etc ) can cope with an extra 55 amps.
How much diversity is there at 12kw. Many electric showers are 12kw. Its 100amp so that's 23kw flat out to heat the fuse?
There is no diversity.
The largest shower I've ever fitted was 10.5kW and showers only run for 10 mins at a time.
The largest shower I've ever fitted was 10.5kW and showers only run for 10 mins at a time.
At what voltage is the 12kW quoted?
Installation method?
No diversity,
Installation method?
No diversity,
100A, but the supplier may not allow that sort of load if it affects neighbouring properties.
And the actual supply voltage is?
And the existing connected load is?
Though the cut-out may say 100A on the fuse carrier, does it have a 100A fuse in it?
Is that what the manufacturer states 12000W @ 230V?
What if the main breaker is derated to 80amp Max. More protection for the fuse. Was intended to heat the property prior to being occupied.
What is a typical heating load on a storage heater circuit domestically?
That won't make any difference to the current the boiler takes. That breaker is a switch, not a fuse or MCB.
Using a lower current main switch increases the risk of the contacts / terminals of the switch over heating and causing damage to the switch and the CU
Hmm
Before connecting a fixed load of that size you DO need the permission of the DNO (ENWL) (not the supplier) failure to do so will render you in breech of the National Conditions of Supply (the contract you have with them) and will make you liable to be disconnected if yiou cause any problems to the supply equipment.
That will vary based on the individual design for the property (storage heaters, if I recall, are available in 1.8kW, 2.5kW and 3.3kW each would be supplied from a Cu on an individual circuit to a switched outlet), though in practice the maximum permitted off peak load has never been greater than 20kW for a domestic property, such load being the sum of the storage heaters, immersion heaters and a small allowance for other loads in use overnight.
At the end of the day if you do blow the cut-out fuse, the first time is free, following that it will be down rated to 80A and you will be charged about £90 for each subsequent visit.
This charge will not be direct to you but to your supplier who will add it to your bills
A load check will also be carried out, if it shows you are overloading the supply and afire ensues those load readings will be passed to your insurer.
Before connecting a fixed load of that size you DO need the permission of the DNO (ENWL) (not the supplier) failure to do so will render you in breech of the National Conditions of Supply (the contract you have with them) and will make you liable to be disconnected if yiou cause any problems to the supply equipment.
That will vary based on the individual design for the property (storage heaters, if I recall, are available in 1.8kW, 2.5kW and 3.3kW each would be supplied from a Cu on an individual circuit to a switched outlet), though in practice the maximum permitted off peak load has never been greater than 20kW for a domestic property, such load being the sum of the storage heaters, immersion heaters and a small allowance for other loads in use overnight.
At the end of the day if you do blow the cut-out fuse, the first time is free, following that it will be down rated to 80A and you will be charged about £90 for each subsequent visit.
This charge will not be direct to you but to your supplier who will add it to your bills
A load check will also be carried out, if it shows you are overloading the supply and afire ensues those load readings will be passed to your insurer.
The first step is to contact ENWL and apply for the additional load, either by phone during the working week on 0800 195 4141 or via the website. (use the Service Alteration paperwork but make it clear it is an application for additional load only).
Once and only if permission is granted then you could purchase it and install it using a qualified electrician to do the necessary wiring as it would be classed as a new circuit which is notifiable under Part P of the Building Regulations
Once and only if permission is granted then you could purchase it and install it using a qualified electrician to do the necessary wiring as it would be classed as a new circuit which is notifiable under Part P of the Building Regulations
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