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24volt and 230 volt in same trunking

Former Community Member
Former Community Member
Testing a building where the fire alarm in another building has been extended into the 1 I am testing. the old wiring has been used and is laid with a metal trunking.

Just wondered what that thought is on coding??
  • 0
    if the 24 V wiring is using a cable that could be used for mains and so has adequate insulation to hold off 240v, then probably no real issue. If it is in something else, and only rated to 24V, then not very good . The trunking is not the dominant part of the question
  • 0
    Agree. So long as the 24v cable insulation matches that of the cables carrying the highest voltage present in the trunking then all should be ok.
  • Former Community Member
    0 Former Community Member
    However, BS 5839 Part 1 would tend to preclude randomly mixing the fire alarm circuits in with general circuits - principally to stop the life safety circuits  being damaged by general fiddling with the LV Power (ie non life safety) circuits.


    It's perfectly credible that the 24V circuits are fine in terms of insulation grading - but the whole system would not comply with BS 5839-1


    Regards


    OMS

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