rcd rating is this suitable

[neilyboy]

quick question,
80a/30ma rcd protecting 5 32a circuits
2 ring mains
1 oven
1 shower
1 hob
ive been told the shower and hob need upgraded to 40a mcbs
is the rcd still suitable
one ring main supplys 4 bedroom sockets the other kitchen/living area with 7 sockets.

 

[Julie.]

What 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?

 

[neilyboy]

What 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?

incoming is 100a and I did a quick google on the hob (halogen) manufacturers recommend 32a
so im not sure why he wants it upgraded

 

[buzzlightyear]

incoming is 100a

how do you know if it is , some incomers say they are but not .

 

[neilyboy]

how do you know if it is , some incomers say they are but not .

service fuse is 100a I thought that was the question

 

[neilyboy]

how 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....

 

[buzzlightyear]

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.

i would not venture doing that ,is there two consumer units ,your post says

80a/30ma rcd protecting 5 32a circuits
2 ring mains

take a pic of the set up regarding the cu.

 

[neilyboy]

i would not venture doing that ,is there two consumer units ,your post says

take a pic of the set up regarding the cu.

I was being facetious...sometimes that is the default reply mechanism on here...
there should be a picture on its way

 

[neilyboy]

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

 

[Julie.]

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

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