ebee:
Interesting Lyle,
It does enhance a bit my perception of two cascading RCDs to a TT to add resiliance.
In this instance even a Delayed 100mA RCD prior to a 30mA non delayed might have saved the day.
Different makes in different locations might help a little too.
OK a 100 mA and a delayed RCD does not count as personal protection but in instances such as this a bad fault and a non functioning RCD might have caused the TD 100 to trip seconds before touching occoured thereby giving a warning that something was wrong
Indeed Ebee! Where enhanced resilience is required following the assessment of the risk, it might be difficult to contend that a single RCD is an adequate control measure. Just because 7671 doesn’t require it doesn’t mean it isn’t required!
ebee:
Interesting Lyle,
It does enhance a bit my perception of two cascading RCDs to a TT to add resiliance.
In this instance even a Delayed 100mA RCD prior to a 30mA non delayed might have saved the day.
Different makes in different locations might help a little too.
OK a 100 mA and a delayed RCD does not count as personal protection but in instances such as this a bad fault and a non functioning RCD might have caused the TD 100 to trip seconds before touching occoured thereby giving a warning that something was wrong
Indeed Ebee! Where enhanced resilience is required following the assessment of the risk, it might be difficult to contend that a single RCD is an adequate control measure. Just because 7671 doesn’t require it doesn’t mean it isn’t required!
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