3phase lighting and shared neutral

[industryspark]

Holmslaw wrote

My comments were not aimed at you or but at some of the comments, I apologise if you were offended.

Not offended so no apology needed. Its interesting though to see how we all have differing idea's and interpretations of the regs.

Regards.

 

[ricicle]

559.6.2.3

 

[RF Lighting]

 

[ColJack]

we've already said that one, and I quoted it verbatim from the regs book..

559.6.2.3 Groups of luminaires divided between the three line conductors of a three-phase system with only one common neutral conductor shall be provided with at least one device that simultaneously disconnects all line conductors.

..

 

[VanSolo]

To the OP, just a thought. Could you not replace the three 20A mcbs with three single module contactors and three switches to control them?
This would mean downrating the TP breaker in the DB but would give a single point of isolation and solve the functional switching problem.

 

[RF Lighting]

BS7671 permits the use of BSEN60898 MCBs as funtional switches.

(P*ss poor design IMO, but it is allowed)

 

[VanSolo]

BS7671 permits the use of BSEN60898 MCBs as funtional switches.

(P*ss poor design IMO, but it is allowed)

I agree.