Aico alarm wiring instructions

[morqthana]

I guess that with oversleeving at terminations for identification, pink, yellow, mauve, red, etc are already "allowed".

 

[JohnW2]

I guess that with oversleeving at terminations for identification, pink, yellow, mauve, red, etc are already "allowed".

Yes, for a good few 'other' purposes (other than N & E) but perhaps not if the conductor is carry the line of a single-phase or 3-phase) circuit, in which case that might be trumped by the requirement for identification of such a conductor by brown (or black/grey in the case of 3-phase)?

 

[morqthana]

Isn't oversleeving at terminations OK - viz 3C&E used in single-phase?

 

[JohnW2]

Isn't oversleeving at terminations OK - viz 3C&E used in single-phase?

Sure, provided they are oversleeved with the correct colour.

For line conductors of AC circuits, that colour is (per Table 51) required to be brown (for single phase) or brown, black or grey (for 3-phase). I assume that requirement 'trumps' the row lower down the Table which allows all the other colours you mentioned to be used for 'other' purposes, doesn't it?

 

[morqthana]

Well - if identified at the terminations, is the degree of safety any less?

 

[JohnW2]

Well - if identified at the terminations, is the degree of safety any less?

Oh, I think I've been misunderstanding you. I thought you were talking about your suggestion that identifying colours might, hypothetically, only be defined for N and E (presumably blue and G/Y) with any other colours allowed for 'anything else', nd that you were therefore suggesting that oversleeving (of any colour) WITH "pink, yellow, mauve, red, etc." would be OK for identifying 'L'.

However, it now sounds as if you were actually talking about oversleeving "pink, yellow, mauve, red, etc" WITH brown *(or black or grey in 3-phase) to identify 'L'. Is that the case?

Whatever, as often discussed in the past, I think the only safety issue with 'identification only at terminations' arises if someone 'breaks into' a cable somewhere in mid-course - and, even then, it's really only if a G/Y conductors has been over-sleeved (only at terminations) for use as a live conductor (something which I think has always been prohibited) that there is likely to be any significant safety issue.

 

[morqthana]

However, it now sounds as if you were actually talking about oversleeving "pink, yellow, mauve, red, etc" WITH brown *(or black or grey in 3-phase) to identify 'L'. Is that the case?

Yes.

Whatever, as often discussed in the past, I think the only safety issue with 'identification only at terminations' arises if someone 'breaks into' a cable somewhere in mid-course - and, even then, it's really only if a G/Y conductors has been over-sleeved (only at terminations) for use as a live conductor (something which I think has always been prohibited) that there is likely to be any significant safety issue.

Indeed.