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Insulation Resistance Testing

Chivers
Hi,


I work as a Maintenance Electrician and part of my Testing role is to complete Insulation resistance testing on Supply cables between Metal cabinets on Highways Equipment - Normally Armoured or similar.


I have had 2391 since 2006 and at no point in my Testing Course did i ever come across something a colleague of mine seems to be insisting we all do. That is "Conductor to Ground Testing". I have in the past completed Phase to Neutral, Neutral to Earth and Earth to Phase and recorded these on my test certificates (All supplies are single phase). As far as I know there is nowhere to record such tests on any software or sheets I have seen. Am I missing something fairly obvious or does this seem pointless to others too? 


Regards Chivs
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    It is normally advised to do insulation tests (of the L+N to E flavour described by the OP) if possible after  the circuit CPC is connected to an electrode and/ or bonded to plumbing or what have you.

    A test for live cores to CPC  is one thing, but in non-armoured cable, or at the ends of an armoured one where the cores separate off, it is possible, though rare, that a damaged jacket may expose live copper to true ground, or to the fabric of the structure, but not actually to the metal of CPC core or armour  itself.

    I suspect you already knew this, but the form of words may be confusing.
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  • 0
    It is normally advised to do insulation tests (of the L+N to E flavour described by the OP) if possible after  the circuit CPC is connected to an electrode and/ or bonded to plumbing or what have you.

    A test for live cores to CPC  is one thing, but in non-armoured cable, or at the ends of an armoured one where the cores separate off, it is possible, though rare, that a damaged jacket may expose live copper to true ground, or to the fabric of the structure, but not actually to the metal of CPC core or armour  itself.

    I suspect you already knew this, but the form of words may be confusing.
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