Metal back box Earthing?

[Welderpaul]

That's the one

 

[Turbo]

correct the only time you need to earth the back box is if its a surface metal one or grid switches

Our mens shed was rewired last year by a 'professional' electrician employed by our landlords, the local council.
All sockets are surface mounted all metal ones. We had to open up a socket to install panelling behind it and the back box had no earth tail connecting it to the faceplate. I checked the others and all sockets were the same.
The boxes were screwed to a length of steel cable tray which in turn was screwed to the steel purlions of the building framework.
Is the attachment to the building framework enough to pass earthing regs?
Its a steel framed building clad in box profile sheeting.

 

[The_Yellow_Ardvark]

Hey Brightspark, another question about things that go bang. Do smoke alarms need to be on their own breaker?

Yes they do.
Fire alarms.
From the breaker to the double pole isolated, in red, needs to be fed in fp200 cable.
The breaker has to be clearly marked, you can get red switch breakers.

240v with battery back up can be fed from a lighting circuit, but if they are interlinked or interconnected, it is advised that a separate breaker is used.

 

[dobbslc]

That would be for commercial premises, in domestic I just use a separate breaker for the smokes.

 

[Welderpaul]

Yes they do.
Fire alarms.
From the breaker to the double pole isolated, in red, needs to be fed in fp200 cable.
The breaker has to be clearly marked, you can get red switch breakers.

240v with battery back up can be fed from a lighting circuit, but if they are interlinked or interconnected, it is advised that a separate breaker is used.

For smoke alarms in a house?..

 

[The_Yellow_Ardvark]

For smoke alarms in a house?..

In a private house they tend to be of a domestic light breaker.
In house run by a charity or similar depending on size.
Powered through the E light supply. Or on their own breaker.

 

[brightspark]

240v with battery back up can be fed from a lighting circuit, but if they are interlinked or interconnected, it is advised that a separate breaker is used.

it is not advised at all it is optional and can be fed from a local circuit its not always convinient to wire back to a seperate mcb https://www.google.co.uk/search?q=a...QVgQ9FVTQOQRpIHBDE1LjagB9SHAQ&sclient=gws-wiz

 

[The_Yellow_Ardvark]

it is not advised at all it is optional and can be fed from a local circuit its not always convinient to wire back to a seperate mcb https://www.google.co.uk/search?q=a...QVgQ9FVTQOQRpIHBDE1LjagB9SHAQ&sclient=gws-wiz

You have no need to preach to the converted, I have seen it all.

It is a difficult one.

 

[brightspark]

You have no need to preach to the converted, I have seen it all.

It is a difficult one.

no it isnt its a practical one and personal choice

 

[The_Yellow_Ardvark]

no it isnt its a practical one and personal choice

When I say difficult, not as in hard work etc, but what is the best for the customer.