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AMD 2 - insulation testing

AJJewsbury
Looks like the DPC has made a bit of a change about insulation testing where some devices might be vulnerable to a 500V test voltage or distort the results. Previously we were allowed to either disconnect the item concerned (or do the test prior to initial connection) OR carry out a 250V test (with a 1MΩ limit to meet).


As I read it, a full 500V test will soon be required prior to connection of such equipment PLUS an additional 250V test (with a 1MΩ limit to meet) will be required after it is connected.


I can see the sense in that, in that it doesn't 'excuse' the rest of the circuit from a full 500V test, but I'm slightly uneasy about some equipment not being happy with a relatively long duration 250V d.c. test L&N - PE - especially if it has to meet a 1MΩ limit. Does anyone have any thoughts on that?


All strictly speaking for an initial verification - for a periodic we still seem to have the flexibility of choosing 'appropriate' tests (however that's going to be interpreted...).


Seems it's going to be a bit of extra work, especially if you've a house full of USB power sockets....


   - Andy.
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    Chris Pearson:

    I have a couple of SRCDs. The manufacturer's instructions say that the product should be removed from the circuit prior to insulation resistance testing. That's fine if you have only one in a ring, it's on a spur, or is at the end of a radial circuit, but a bit of a problem otherwise.


    You've got to ask whether that's fit for purpose in a BS 7671 installation at the present time ... but perhaps an indicator of the way things will change in future.


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    Chris Pearson:

    I have a couple of SRCDs. The manufacturer's instructions say that the product should be removed from the circuit prior to insulation resistance testing. That's fine if you have only one in a ring, it's on a spur, or is at the end of a radial circuit, but a bit of a problem otherwise.


    You've got to ask whether that's fit for purpose in a BS 7671 installation at the present time ... but perhaps an indicator of the way things will change in future.


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