Discuss rcd rating is this suitable in the UK Electrical Forum area at ElectriciansForums.net
incoming is 100a and I did a quick google on the hob (halogen) manufacturers recommend 32aWhat is the incoming fuse?
If that's a 60A or 80A then the rcd couldn't really be overloaded.
What size is the hob to need 40A?
how do you know if it is , some incomers say they are but not .incoming is 100a
service fuse is 100a I thought that was the questionhow do you know if it is , some incomers say they are but not .
i could cut the seal and find out....maybe the guy who says i need an upgraded mcb cut it open and sealed it again supply cable is500/1000v rated,im in a cupboard with crap glasses on....how do you know if it is , some incomers say they are but not .
i would not venture doing that ,is there two consumer units ,your post saysi could cut the seal and find out....maybe the guy who says i need an upgraded mcb cut it open and sealed it again supply cable is500/1000v rated,im in a cupboard with crap glasses on.
take a pic of the set up regarding the cu.80a/30ma rcd protecting 5 32a circuits
2 ring mains
I was being facetious...sometimes that is the default reply mechanism on here...i would not venture doing that ,is there two consumer units ,your post says
take a pic of the set up regarding the cu.
The incoming fuse could be 100A, but most often they are 80A - the holder in all cases is rated 100A and the picture you posted only shows the standard fuse holder rating, there is nothing in the photo to confirm the actual fuse size.ive misread that last post from buzz I quickly read it and thought you asked for a picture of the cut out
and im on my way home now...sorry
Thanks for the reply,The incoming fuse could be 100A, but most often they are 80A - the holder in all cases is rated 100A and the picture you posted only shows the standard fuse holder rating, there is nothing in the photo to confirm the actual fuse size.
So the question of actual load remains, in order to exceed 80A essentially the shower, all the Hobs and around 10A of rfc load would all have to be on together, if this is a typical house, I would think this would be very unlikely.
If it is someone running a home cooking business, with a few fan heaters around the place etc, and kids taking long showers etc; then they could be in excess of 80A.
I don't subscribe to the old style estimates for max demand in terms of lighting and ring finals, as we now distribute the loads over several circuits, not because of load, but for safety/security of supply.
The modern model of multiple circuits doesn't mean a corresponding increase in load, merely a distributed 'same' load
can you direct me to that section please that would save me a lit of time/botherI thought the regs now say that the rating of the RCD must be equal to or exceed the sum of the ratings of all the MCBs it feeds, without diversity, OR, the rating of the upstream protective device must not exceed the rating of the RCD?
if thats right can it be applied retrospectively? that would mean an awful lot of rcds needing changedI thought the regs now say that the rating of the RCD must be equal to or exceed the sum of the ratings of all the MCBs it feeds, without diversity, OR, the rating of the upstream protective device must not exceed the rating of the RCD?
if thats right can it be applied retrospectively? that would mean an awful lot of rcds needing changed
Here's the thing then, the guy doing the EICR has said the shower is underrated and the hob is underrated and advised changing the whole board instead of me uprating the 2 mcb's.This is where the problem is, yes the board is not dual RCD and yes its not to current standards but he has already passed a few of the boards with only C3's and C1's (blanks missing from front of boardRegulations do not need to be applied retrospectively but if you are making changes then all changes must be made to current standards..
You could contact the DNO and ask them, I can't remember the exact section but Brian is correct, as standard now if fitting a dual RCD board which I tend to fit RCBO boards I would fit dual 100A type A RCD's, as if you cannot be sure what the size of the fuse is you should assume it is worst case scenario of 100A..
Why has he determined the mcb's are underrated?Here's the thing then, the guy doing the EICR has said the shower is underrated and the hob is underrated and advised changing the whole board instead of me uprating the 2 mcb's.This is where the problem is, yes the board is not dual RCD and yes its not to current standards but he has already passed a few of the boards with only C3's and C1's (blanks missing from front of board
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