Rating of CU main switch

[Beeg]

Hi all,

I noticed on my consumer unit that the main switch is rated for 100Amps, however the total load of all the MCBs is over 150Amps!

I appreciate that diversity COULD (?) be applied in that not every circuit would be simultaneously running at full capacity, but is the installation acceptable or does the main switch need uprating?

Thanks
Beeg

 

[DT1991]

At first glance I would not worry.

If you are concerned however i would phone a electrican to come and take a look.

Diversity can be applied to almost all circuits shown in your CU.

Main thing that's bugging me is that Wylex RCD!

 

[James]

At first glance I would not worry.

If you are concerned however i would phone a electrican to come and take a look.

Diversity can be applied to almost all circuits shown in your CU.

Main thing that's bugging me is that Wylex RCD!

Agree with you, it looks like the Wylex RCD is a close but not perfect fit. could be putting stress on the buss bar

 

[Beeg]

At first glance I would not worry.

If you are concerned however i would phone a electrican to come and take a look.

Diversity can be applied to almost all circuits shown in your CU.

Main thing that's bugging me is that Wylex RCD!

At first glance I would not worry.

If you are concerned however i would phone a electrican to come and take a look.

Diversity can be applied to almost all circuits shown in your CU.

Main thing that's bugging me is that Wylex RCD!

Thanks DT. Can I ask why the RCD is bugging you?

 

[Charlie_]

What is the main incoming fuse?
Will probably 100a or less

 

[westward10]

Thanks DT. Can I ask why the RCD is bugging you?

It is a non compatible component and should not have been fitted.

 

[Barnaby Stedman]

was looking at a cu someone else had installed and it had a 100A main switch but maximum load of all circuits totalled just over 340A so i wouldnt worry too much - you're not the worst.

Also - underating is safer than over rating. it is a totally safe installation - there are not going to be safety issues because you think the supply isnt big enough...unless you're running life machines or something

 

[James]

was looking at a cu someone else had installed and it had a 100A main switch but maximum load of all circuits totalled just over 340A so i wouldnt worry too much - you're not the worst.

Also - underating is safer than over rating. it is a totally safe installation - there are not going to be safety issues because you think the supply isnt big enough...unless you're running life machines or something

hmmm, I would prefer an over rated main switch any day rather than an under rated one.

 

[telectrix]

Thanks DT. Can I ask why the RCD is bugging you?

better to replace the proteus crap MCBs with wylex.

 

[James]

better to replace the proteus crap MCBs with wylex.

I'm not a great fan of either but I see your point, proteus is in my opinion the bottom of the barrel.

 

[Octopus]

Given all your recent questions and the photo of that board I would recommend you have some form of inspection done ....

 

[Wilko]

Hi - in this case the isolator is rated equal or more than the upstream overload protective device at 100A.

 

[123]

better to replace the proteus crap MCBs with wylex.

But this one is Protek

 

[richy3333]

better to replace the proteus crap MCBs with wylex.

Its not even proteus rubbish Tel. It's Protek!!

 

[westward10]

I think they are Tels own brand he just messed up on the logo, it should say ProTel.

 

[Charlie_]

A knock off version of proteus haha

 

[Beeg]

Thanks to everyone for your replies and advice.

I’ll give you all a break from my amateur questions now

Thanks again
Beeg