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CU capacity
- Thread starter ChrisR
- Start date
Max. current for what?
The main service fuse determines the maximum current you can draw through all the circuits connected to it at any given time.
The rating on the main isolator switch at the CU is only there to tell you the maximum current it is rated for and should be equal to or greater than the rating of the main service fuse.
The DNO will upgrade your fuse if the supply cable is suitable for a small fee (sometimes free) But you will have to pay to have it upgraded if the cable is not sufficiently sized.
Davy
The main service fuse determines the maximum current you can draw through all the circuits connected to it at any given time.
The rating on the main isolator switch at the CU is only there to tell you the maximum current it is rated for and should be equal to or greater than the rating of the main service fuse.
The DNO will upgrade your fuse if the supply cable is suitable for a small fee (sometimes free) But you will have to pay to have it upgraded if the cable is not sufficiently sized.
Davy
DNO?
So you have to take the cover off the main fuse to see what size it is, presumably, if it's one which isn't marked on the outside.
What size cable would it have to be to be suitable for a 100A fuse?
Does it tend to go with the date of the supply installation?
So you have to take the cover off the main fuse to see what size it is, presumably, if it's one which isn't marked on the outside.
What size cable would it have to be to be suitable for a 100A fuse?
Does it tend to go with the date of the supply installation?
Distribution Network Operator.
Taking off the cover is the only sure way to find out what fuse is installed. Unfortunately you are not allowed to do so. They are usually sealed and contain live parts so I'd advise you don't touch. Give your DNO a ring and ask them, they might have the details on file and if not they can usually send someone around to check.
The cable size needed will depend on its length and type of cable used among other factors.
Why do you want the fuse upgraded?
Davy
Taking off the cover is the only sure way to find out what fuse is installed. Unfortunately you are not allowed to do so. They are usually sealed and contain live parts so I'd advise you don't touch. Give your DNO a ring and ask them, they might have the details on file and if not they can usually send someone around to check.
The cable size needed will depend on its length and type of cable used among other factors.
Why do you want the fuse upgraded?
Davy
Diversity for lighting is 66% of total and for ring circuits its 100% for the first and 40% of remainder.
A point to remember is that the service fuse can take a fair overload for quite a few minutes. It might not be necessary to have the supply upgraded considering the short lengths of time people are in the shower.
Davy
A point to remember is that the service fuse can take a fair overload for quite a few minutes. It might not be necessary to have the supply upgraded considering the short lengths of time people are in the shower.
Davy
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How are you going to wire these showers?
In my experience, most CU manufacturers prohibit the use of more than one MCB rated 40A or higher.
Why not install one electric & one mixer shower?
In my experience, most CU manufacturers prohibit the use of more than one MCB rated 40A or higher.
Why not install one electric & one mixer shower?
Someone on the plumbing forum was told he couldn't have 2 electric showers. Didn't seem an outrageous ask, hence the line of question. 60A isn't much.
Personally I'd rather have an electric-only house, all this gas and pumps and valvery and leaky rads just goes wrong all the time. Keeps me emplyoyed, though.
Personally I'd rather have an electric-only house, all this gas and pumps and valvery and leaky rads just goes wrong all the time. Keeps me emplyoyed, though.
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