Earthing Reg

[SimpleSimon]

Could anyone point me out to a reg that states an earthing fly lead for a metal back box can be opted out if fixed lugs are involved?

Simon
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[malcolmsanford]

There isn't one.

 

[Deleted member 9648]

It's guidance only....where I have seen it cant recall...could be in the OSG or one of the GN's.

 

[Guest123]

Guidance on this is vague at best.

Essentially it's your call as to wether 411.4.2 can be satisfied by the path created by the faceplate screws or not. Guidance suggests that where both lugs are adjustable, this would not be the case and an earth lead should then be fitted.

IMHO, a flylead should always be fitted.

 

[Deleted member 9648]

Guidance on this is vague at best.

Essentially it's your call as to wether 411.4.2 can be satisfied by the path created by the faceplate screws or not. Guidance suggests that where both lugs are adjustable, this would not be the case and an earth lead should then be fitted.

IMHO, a flylead should always be fitted.

Agreed...but did have a job a while ago fitting flat plate sockets to a job where the original installer had used 25mm boxes...(lazy git)...Leaving off the flylead made a surprising difference to getting the sockets back.

 

[Deleted member 26818]

The requirement is to earth exposed-conductive-parts.
You have to decide, whether it is the metal back box is an exposed-conductive-part, that requires earthing, and whether the fixed lug, screw, etc would provide sufficient conductivity to be considered as providing a connection to the CPC.

 

[SimpleSimon]

Thanks gents.
Question came from a EICR last night. I said a fly lead is needed but another spark said no need as its fixed lugs.
ive never heard this point and couldnt find it in the regs.
Like you Lenny i would rather have the fly lead, metal face plate on a metal shop floor gondala...better safe than sorry.

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[malcolmsanford]

Well I would have said that would definitely warrant a fly lead as that metal face plate being attached to a metal gondala(??) is an exposed conductive part

What is a gondala ?

 

[SimpleSimon]

Well I would have said that would definitely warrant a fly lead as that metal face plate being attached to a metal gondala(??) is an exposed conductive part

What is a gondala ?

On shop floors the mobile display units

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[Guest123]

Obviously we are assuming a T&E wiring system here, there are however some instances where a flylead MUST be fitted I.e, where the containment system or cable sheathing is being utilised as the CPC, galv conduit or MICC for example.

543.2.7 refers.

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[telectrix]

good point, lenny. missed that one.

 

[CrazyScozzese]

GN1...

Where an accessory has an earthing terminal incorporated, the protective conductor should be connected at the earthing terminal. Accessories which have an earthing terminal incorporated, such as socket-outlets, normally have an earth strap connecting the earthing terminal to one or both of the fixing holes. Flush metal accessory boxes usually have at least one fixed lug (see Figure 7.8). The IET Wiring Regulations Policy Committee has agreed that such boxes may be earthed via the tight metal-to-metal contact of the fixing screw in the fixed lug. Consequently, unless both lugs are of the adjustable type, it is not necessary to connect the earthing terminal of the accessory to the earthing terminal in the associated flush metal accessory box by a separate protective conductor (i.e. an earthing tail).

However, as mentioned in a post above, it has to be a tight metal connection.

 

[Guest123]

GN1...

Where an accessory has an earthing terminal incorporated, the protective conductor should be connected at the earthing terminal. Accessories which have an earthing terminal incorporated, such as socket-outlets, normally have an earth strap connecting the earthing terminal to one or both of the fixing holes. Flush metal accessory boxes usually have at least one fixed lug (see Figure 7.8). The IET Wiring Regulations Policy Committee has agreed that such boxes may be earthed via the tight metal-to-metal contact of the fixing screw in the fixed lug. Consequently, unless both lugs are of the adjustable type, it is not necessary to connect the earthing terminal of the accessory to the earthing terminal in the associated flush metal accessory box by a separate protective conductor (i.e. an earthing tail).

However, as mentioned in a post above, it has to be a tight metal connection.

Thanks for posting that.

For the life of me I couldn't remember where I'd read it. )

Too many publications out there these days!

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