New metal roof on existing concrete garage

[Bullterrier]

Hello all, I need some advice please.

We have a detached concrete sectional garage that is one of a semi detached pair with our neighbour. The garage has power (via SWA off a fused spur within the house with earthing provided back to the TN-C-S supply). One double socket and a light via a 3amp spur. All has been tested and found to be fine. The garage has a metal up and over door that was not deemed to be an extraneous conductive part when the power was installed or when recently examined and tested as part of a periodic inspection.

The roof is currently cement board (corrugated with white asbestos) and the neighbour has damaged theirs such that it needs replacement.

The roof spans both garages so his insurer intends to replace both with powder coated profiled metal. A new non asbestos roof is a nice present.

The insurer plans no changes to the power provision as they state that the metal roof isn't in contact with the grounŷd and so is not an extraneous conductive part.

Given we currently have a fully happy periodic inspection in place for the whole house and garage I need to make sure they are correct and that we don't need the new roof bonding (10mm cable back to the meter point would be one heck of a task (it's on the other outside wall of the house and this is a mid terrace) so a TT spike solution would probably be needed).

Is a metal roof that a) connects to next door and b) isn't in contact with the ground an extraneous conductive part? If so, was the garage door already one? The guy who does our electrical work has just started his 3 week holiday in Florida, hence asking your learned selves here so we don't end up with a problem after the insurers' contractor leaves.

Thanks in advance....

 

[westward10]

If the new roof is "floatig" and has no direct contact to the ground then no, it doesn't need bonding.

 

[Bullterrier]

Thanks. Does that also apply to the up and over door?

 

[westward10]

The garage door doesn't need bonding.

 

[telectrix]

what he said. ^^^^^. fit and forget.

 

[Bullterrier]

That's good news - thanks. The house is rented and I like to keep squeaky clean.

 

[Michael4321.]

If garage door is outside must be connected to the Equipotential Ground and all metallic hand contact see the Law of Electrical Ground and Schematics Diagram for Earth Ground. Prevent Atmospheric Electrostatic also.

 

[DPG]

If garage door is outside must be connected to the Equipotential Ground and all metallic hand contact see the Law of Electrical Ground and Schematics Diagram for Earth Ground. Prevent Atmospheric Electrostatic also.

Maybe in Romania, but not here!

 

[Darkwood]

If garage door is outside must be connected to the Equipotential Ground and all metallic hand contact see the Law of Electrical Ground and Schematics Diagram for Earth Ground. Prevent Atmospheric Electrostatic also.

The Forum is based around the British Standards BS7671 and advice given should fall within these standards unless otherwise specified, I assume your own regulations differ to ours so please if giving advice make it clear which regulations you are citing your information. We of course welcome members from across the globe but heed caution when offering advice that you are not doing so in contradiction of our British Standards unless the thread or post has specifically asked for advice regarding other reg's.

 

[Pat H]

Just don't mention the Scottish...

 

[telectrix]

The Forum is based around the British Standards BS7671 and advice given should fall within these standards unless otherwise specified, I assume your own regulations differ to ours so please if giving advice make it clear which regulations you are citing your information. We of course welcome members from across the globe but heed caution when offering advice that you are not doing so in contradiction of our British Standards unless the thread or post has specifically asked for advice regarding other reg's.

maybe romania have just got the 15th.

 

[Deleted member 9648]

maybe romania have just got the 15th.

I believe Cockburns in charge out there.

 

[telectrix]

yep. i saw a Dacia taxi today. had a 3 ft. piece of 6mm Gn/Y hanging from the bumper.

 

[Deleted member 9648]

Thinking about it though I'd pay good money to watch someone bond an up and over garage door......

 

[telectrix]

easy peasy. a 10ft service loop in tri-rated 10mm.