Earth continuity options through plastic isolator?

[crappy]

Folks,

What options do I have to continue earth through the isolator? Because my compression glad is 20mm and I had to use the threaded 25-20 reducer I cannot access the gland internally.

I will have a second swa exiting to the right of this one. Is it OK to keep earth external between the two?

I'm doing the donkey work and a sparky coming to review and sign off. Don't want to waste his time with me getting it wrong.

 

[Adam_151]

You could put banjo tags on with the flylead run externally, however if installed exposed to the whether, ir tends to corrode, certainly if the installer uses a galv roofing bolt...

Other options are to fit an earth nut internally after swapping the reducer for a metal one.

Could terminate both SWAs into a trouser box and bush that into the isolator, you'd probbly be best using 25mm one with two galv reducers on the SWA glands

 

[crappy]

Thanks. It is going to be external.
I'll get some bronze reducers and do it that way.

 

[333rocky333]

Not sure an Earthing nut would fit even with the thread protruding, looks like the fixing lugs in the way.

 

[bernardgreen]

This might help if the spacing between holes matches the box

Earthing Kit for Combi 308 Enclosure (Pack of 2)

Speeds up installation of SWA cable

www.cef.co.uk

Wiska Earth Clamp Bar for SWA Glands for WK1210 | Wiska (10101476)

 

[SUNRAY]

This again highlights the brass gland is not always the best method of terminating SWA

 

[crappy]

Very help - thanks all.

 

[winston1]

I'm doing the donkey work and a sparky coming to review and sign off. Don't want to waste his time with me getting it wrong.

A spark cannot (legally) sign off work he did not do himself. He is signing to say he designed and installed it.

 

[SUNRAY]

A spark cannot (legally) sign off work he did not do himself. He is signing to say he designed and installed it.

After designing it a spark can legitimately allow another to work under his instruction.

This job can be done without any exposed metal with commercially manufactured parts and no difficulty making the connexions.

 

[bernardgreen]

A spark cannot (legally) sign off work he did not do himself. He is signing to say he designed and installed it.

https://electrical.theiet.org/media/2818/bs7671-eic.pdf

There appears to be spaces for

A designer to sign the form as "designer"
An installer to sign the form as "installer"
An inspector to sign the form as "inspector"

Three separate people,

Or am I getting it wrong

 

[Taylortwocities]

A spark cannot (legally) sign off work he did not do himself. He is signing to say he designed and installed it.

Oh lord, why can you never provide something that actually HELPS the topic. It's always a nit pick, never anything constructive...

There is a single sign certificate that indeed includes the design, install and test when a sole person has done it all..
Anyone who has experience in the real world (or has a copy of BS7671) will know that there is also a separate installation cert where different (competent) persons are responsible for and certify the separate activities.

 

[Jackrae]

Well worth a look and shows how best to facilitate earth connections

 

[Taylortwocities]

Well worth a look and shows how best to facilitate earth connections

I think that the OP knows that. His issue is that he should have used, or created, a 20mm hole for the gland. The box appears to only have knock outs for 25 and 16mm. I dont know where the box came from, never seen one that didn't have 20mm gland entry options.
Unfortunately he has used the 25mm knockout and fitted a 25mm-20mm reducer. That stands the gland too far off the box for a banjo, or for a piranha nut.

@crappy my helpful suggestion
(@winston1 please note)
is that you remove the gland and reducer. Buy a pair of the smallest 25mm SWA glands and screw that direct in. No reducer required. You'll need to fit the banjo for the earth. You'll need the second 25mm gland of the pair for the second SWA!.

Think that should do it?

 

[SUNRAY]

Oh lord, why can you never provide something that actually HELPS the topic. It's always a nit pick, never anything constructive...

Indeed why, why, why???

There is a single sign certificate that indeed includes the design, install and test when a sole person has done it all.. Anyone who has experience in the real world (or has a copy of BS7671) will know that there is also a separate installation cert where different (competent) persons are responsible for and certify the separate activities.

If an electrician and his assistant install a new circuit, the assistant is not required to sign the documentation.
The assistant can quite legitimately be the customer as long as long as they follow the electricians instruction.

https://electrical.theiet.org/media/2818/bs7671-eic.pdf

There appears to be spaces for

A designer to sign the form as "designer"
An installer to sign the form as "installer"
An inspector to sign the form as "inspector"

Three separate people,

Or am I getting it wrong

My interpretation of this (which I'm extremely happy to be corrected) is the different boxes are to be used when different trades complete the sections, I'm thinking more in terms of 'commercial' jobs where the architect does the initial building design, then different specialists (such as ME company) do thier design and the project goes out to tender, then various companies tender for parts of the project, then in this case an electrical company is appointed and parts are sub tendered and sub sub tendered to the lowliest person.
In my case Sunray builds and installs a control panel as a sub to 'Controls are us'.
'Controls are us' may or may not install the cable management for the controls system. They sub to 'ABC environment services' who install the air handling units and ducts.
'ABC environment services' sub to 'Laing ME' who get the contract for all of the mechanical/electrical services such as ventilation, heating, plumbing, drainage, etc
'Laing ME' sub to 'Laing' who get the whole contract for the project. and may very possibly put all of the inspecting out to 'We do Quality Control Ltd'

I don't think (which again I'll stress I' extremely happy to be corrected) the 3 boxes are intended for use when 'Eric the electrician' adds a shed supply but, under supervision (However loose that is), the house holder digs the trench and lays the cable in to save money.

 

[SUNRAY]

Well worth a look and shows how best to facilitate earth connections

Having asked why another always nit picks...
Sorry:
He describes fitting a banjo by trapping it between the plastic enclosure and a locknut, no sorry I don't agree on the basis I've known too many become loose where the plastic spreads under the pressure, ironically he shows a sketch of how to do it which shows 2 locknuts:

However he goes on to the better arrangement of the Earthnut.

Then he goes on to recommend self amalgamating tape but fails to mention that SA tape is made with rubber which needs to be protected from the weather, to stop it perishing.