Main fuse is 63A, but cooker fuse is 120A?

dohouch

Could this be right, sure seems that way.


Main Fuse on Left 63A, cooker 4th from left is 120A. Wouldn't the cooker overload the main fuse?
Anybody able to explain or linkt-to.
rgds

Diggerdunne

its a 20 amp breaker... B20 it says breaker type B and 20 amp. It should be a 32 amp as it should be a six square cable....that 120a is a serial number or somethin like that. Just checked a spare hager board i have in in the van and it says the exact same thing on the 20 amp breakers...

TheBody

Hi OP,

That is actually a 20amp MCB. If you notice the bit that says "B20" on the mcb. The "B" tell you that it it rated for domestic applications and the 20 tells you the rating. 20 is actually low for a cooker. Usually a 32amp mcb is used with a 6mm^2 cable out to the cooker.

Bruthal

As said its a B type 20 amp breaker. Should be a 32 but no problem leaving it if the cooker is not ever tripping it.

Is it an electric or gas hob? Maybe its only powering an electric oven anyway.

The MBN120A is just the MCB`s part number.

m.j.w

is that an example of a badly wired fuseboard? its looks a complete mess, im a maintainance apprentice so havent seen to many fuseboards but that looks terrible!

dohouch

@m.j.w: Really , I wouldn't know, this is the only one I'm familiar with. You're the first person to make that comment. It's not my handy work, you wouldn't like that either.

staker

Agree the looms could be a lot tidier but I've seen an awful lot worse than that tbf.

M cebee

quite a few minor issues with it

certainly won't win any gold medals


what's that B6 on the end for

staker

M cebee wrote: »

what's that B6 on the end for

Passed it off as the doorbell trafo, but it looks like a 2.5mm* leaving the board.

Igniter on a gas hob?

dohouch

M cebee wrote: »

what's that B6 on the end for

Writing on outer box says C. Pump, so maybe Central Heating Pump, and maybe boiler as well. Boiler is in the kitchen.

Bruthal

M cebee wrote: »

quite a few minor issues with it

certainly won't win any gold medals


what's that B6 on the end for

Possibly for that bell traffo.

Bruthal

Them single row boards are no use for new houses these days anyway.

TheBody

dohouch wrote: »

Writing on outer box says C. Pump, so maybe Central Heating Pump, and maybe boiler as well. Boiler is in the kitchen.

Probably the water circulating pump so. They prob used a 6amp mcb instead of using a 5amp fuse.

aido 1976

MBN120A Explained (Its a part no: of the mcb, but it is also an explaination of the item)

MBN = The product family (The 'B' means 'B' curve, for example MCN is a 'C' curve breaker)

120A = The '1' means single pole and the '20A' means 20amp