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Panel/Switchgear Yellow Electricity Warning Labels

Former Community Member
Former Community Member
Guys,


I am trying to find the specific standard that states what voltage value is to be placed on the yellow colored electricity warning labels found on panels/switchgear. As I understand it the electricity warning sign template is coming from ISO 7010. However having read ISO 7010 I can see it makes no reference to what voltage value should appear on the warning label.


Is it the nominal voltage, is it peak voltage, is it rated operational voltage ? 


What standard is specifying this ?


  • 0
    Mike M:



    I take it those labels where the phase to phase voltage was 400 were being applied as part of a client request and not ‍a requirement of some BS standard ?




    well it was in l the IEE wiring regs of the day -which is what  it was called  long before the the IEE became the IET and  BSI got involved in all this electricity stuff.

    I am going back to about 1980; but there are quite a few installations from that era.


  • 0
    It would really clarify things if BS7671 514.10.1 used the term nominal instead of maximum.

    I suspect it's just trying to cover the (perhaps unusual) case where there's more than one nominal voltage present within the same enclosure - you'd just have to have the highest on the label, rather than list all of the ones that exceeded 230V from Earth individually. Perhaps it could say 'maximum nominal voltage' though.


         - Andy.
  • 0
    mapj1:
    Mike M:



    I take it those labels where the phase to phase voltage was 400 were being applied as part of a client request and not ‍a requirement of some BS standard ?




    well it was in l the IEE wiring regs of the day -which is what  it was called  long before the the IEE became the IET and  BSI got involved in all this electricity stuff.

    I am going back to about 1980; but there are quite a few installations from that era.




    Yes, the requirement in the 16th Edition BS 7671:1992 and its amendments,was any voltage (U or U0) above 250 V "and where presence not expected", or where in separate enclosures but simultaneously accessible, needed a voltage warning label indicating the voltage.


    I'm fairly certain the change was made in 16th Edition BS 7671:2001, to pretty much the current requirement based on U0 of 230 V in any enclosure.



    The logic of the current requirement likely circles around two factors:



    • the shock risk is probably based on a voltage to earth

    • if anyone accesses two live conductors, they've breached legislation twice (definitely if they are in separate enclosures)

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