417.3.1

[securespark]

In the last 25 years or so of my career in the industry, I have concentrated on SP wiring.

I have often wondered about the above reg in the green book (I have not yet bought the lastest amendment).

As it is prefaced with 417.3 talking about bare overhead lines being installed to ESQCR 2002, does this mean the subsequent stuff is also referring to installations covered by ESQCR 2002?

What does 417.3.1 mean?

 

[JohnW2]

What does 417.3.1 mean?

I don't think it's just 417.3.1 that is the problem - I find the whole of 417.3 to be confused/confusing to the point of almost being incomprehensible/uninterpretable in parts, and Fig 417 merely adds to my confusion!

I've been aware of the reg but, fortunately, have been able to ignore it (i.e. not try to understand it), since my only interest is in domestic installations, where one does not (or should not!) find ('accessible') 'parts which are at different potentials'.

As for your specific question, I don't think that the preamble in 417.3 about overhead lines under ESQCR 2002 can apply to 417.3.1 (at least, not to most of it), since (i), (ii) and (iii) of 417.3.1. explicitly relate to "bare live parts other than overhead lines".

I'm glad that I don't need to try to make sense of that particular reg

Kind Regards, John

 

[securespark]

"different potentials" is confusing.

Does this copy of Wiring Matters help?

https://www.google.co.uk/url?sa=t&r...9fXrqC5PBooz6ZRkPz19Ng&bvm=bv.131783435,d.d24

 

[JohnW2]

Does this copy of Wiring Matters help?

Not really - at least not for me. It seems to essentially just repeat what 417.3.1 says.

Kind Regards, John

 

[securespark]

Yeah, I read it and it didn't do much to clear the haze: I'm glad it's not just me.

 

[JohnW2]

Yeah, I read it and it didn't do much to clear the haze: I'm glad it's not just me.

It's not - you are in the company of at least one other! The only saving grace for most of us is that, as I said, I don't think it's particularly relevant to domestic, or even commercial, installations.

Kind Regards, John

 

[stillp]

417.3 applies to all of the subclauses of 417.3, so the ESQCR applies to 417.3.1, 417.3.2, and 417.3.3. It seems quite clear to me - what's the problem?

 

[JohnW2]

417.3 applies to all of the subclauses of 417.3, so the ESQCR applies to 417.3.1, 417.3.2, and 417.3.3. It seems quite clear to me - what's the problem?

The reference to ESQCR in 417.3 relates specifically to overhead lines. Most of 417.3.1 explicitly relates to things other than overhead lines.

Kind Regards, John

 

[stillp]

Yes. What's the problem? If you're not concerned with overhead lines then ignore the requirements that relate to them.

 

[EFLImpudence]

The reference to ESQCR in 417.3 relates specifically to overhead lines. Most of 417.3.1 explicitly relates to things other than overhead lines.

I read 417.3.1 as meaning:

A bare live part (which is not a bare overhead line) must be >2.5m from (i), (ii) & (iii);
an bare overhead line does not need to be that distance.

 

[stillp]

A bare live part (which is not a bare overhead line) must be >2.5m from (i), (ii) & (iii)

Or within 2,5 m of a surface expected to be occupied by persons.

an bare overhead line does not need to be that distance

A bare overhead line has to comply with whatever ESQCR 2002 says.

 

[EFLImpudence]

Or within 2,5 m of a surface expected to be occupied by persons.

Or NOT within 2.5m.

A bare overhead line has to comply with whatever ESQCR 2002 says.

Yes, but the bare live part (which is not a bare overhead line) has to comply with 417.3.1.

I think the confusion is due to thinking 417 is about overhead lines; it is not, it is about Placing out of reach

 

[JohnW2]

Yes. What's the problem? If you're not concerned with overhead lines then ignore the requirements that relate to them.

Quite - so what exactly did you mean when you wrote "417.3 applies to all of the subclauses of 417.3, so the ESQCR applies to 417.3.1 ..." when nearly all of that regulation excludes overhead lines?

Kind Regards, John

 

[stillp]

Or NOT within 2.5m.

Oops!

I think the confusion is due to thinking 417 is about overhead lines; it is not, it is about Placing out of reach

That could be the reason, forgetting for the moment about obstacles... Deuce!

 

[stillp]

Quite - so what exactly did you mean when you wrote "417.3 applies to all of the subclauses of 417.3, so the ESQCR applies to 417.3.1 ..." when nearly all of that regulation excludes overhead lines?

Isn't it clear?