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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 ?


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    So in this example the label would at least state 400V as this is the nominal voltage value for Uo however as BS7671 514.10.1 requires that the maximum voltage be stated then this voltage warning label may be required to state all the way up to 440 (690V phase/phase +10%) 759V if indeed that is the maximum voltage at that junction box.

    Humm tricky. If you look at chapter 44 you could decide that the maximum voltage present could be a lot higher again (if you were to take account of all sorts of LV and HV fault conditions - let alone switching or lightning spikes). But that's getting silly (IMO), so my personal interpretation is that they're only asking for a maximum within the context of nominal voltages. It also specifies that the warning should be of 'the maximum voltage to earth present is clearly visible' (my emphasis) - so if it's 690V L-L I think I'd expect a 400V label in that context (690/√3) .

     

       - Andy.
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  • 0
    So in this example the label would at least state 400V as this is the nominal voltage value for Uo however as BS7671 514.10.1 requires that the maximum voltage be stated then this voltage warning label may be required to state all the way up to 440 (690V phase/phase +10%) 759V if indeed that is the maximum voltage at that junction box.

    Humm tricky. If you look at chapter 44 you could decide that the maximum voltage present could be a lot higher again (if you were to take account of all sorts of LV and HV fault conditions - let alone switching or lightning spikes). But that's getting silly (IMO), so my personal interpretation is that they're only asking for a maximum within the context of nominal voltages. It also specifies that the warning should be of 'the maximum voltage to earth present is clearly visible' (my emphasis) - so if it's 690V L-L I think I'd expect a 400V label in that context (690/√3) .

     

       - Andy.
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