extension leads with surge adaptors

[multimick]

don't do much pa testing but noticed a couple of times these show reverse polarity on my megger pat 120 ,but test the pins for continuity and its ok on neutral and earth but no continuity on line,they all work ok ,is the electronics causing problems ?

 

[telectrix]

yes.

 

[multimick]

thanks tel

 

[Deleted member 26818]

Don’t think you’re supposed to IR test at 500V surge protectors?

 

[westward10]

No it will give a false reading as it throws to earth above 250v.

 

[multimick]

i don't ir test at 500 volt

 

[Deleted member 105166]

There's a good case to test at both 500V to prove the functionality of the SPD and 250V to obtain a 'normal' value for typical conditions, i.e. without the SPD operating.

If the 500V test returns a high resistance value, then the SPD is not going to be of any use in a real over voltage situation during operation.

 

[Deleted member 26818]

There's a good case to test at both 500V to prove the functionality of the SPD and 250V to obtain a 'normal' value for typical conditions, i.e. without the SPD operating.

If the 500V test returns a high resistance value, then the SPD is not going to be of any use in a real over voltage situation during operation.

My understanding of how SPDs work, is that every time there is a surge, material is lost.
Eventually, if there are enough surges, the device has to be replaced.
Testing at 500V will reduce the life of the device.

 

[westward10]

Remember those MK filtered sockets which had a replaceable filter cassette. Once it had been triggered a certain amount of times it indicated it needed replacing.

 

[Deleted member 26818]

Remember those MK filtered sockets which had a replaceable filter cassette. Once it had been triggered a certain amount of times it indicated it needed replacing.

Still get them now.