USB sockets and IR testing help...

[Green Sparkie]

Hi all,

I have seen somewhere recently that one particular brand of USB socket is good for 500v for IR testing, but I can't now remember where or which brand. Is this now the standard for these things? Has anyone come across any brands which are ok to do this on? Help appreciated...

 

[ashrow]

I have never come across any make that says its ok (but only just started reading said paper work that comes with them!)
I either do not test between L-N or just remove socket to carry out full testing

 

[buzzlightyear]

It should also be noted that the electronic circuitry inside the SMPS could easily be damaged by a 500 V insulation test injected across it. Consequently the USB port may fail to function following a 500 V Line to Neutral insulation test.

 

[Green Sparkie]

It should also be noted that the electronic circuitry inside the SMPS could easily be damaged by a 500 V insulation test injected across it. Consequently the USB port may fail to function following a 500 V Line to Neutral insulation test.

Hence the reason for asking.

 

[Richard Burns]

BG USB sockets state on them that an IR test will give a reading above 10MΩ.
I cannot remember which test i.e. 500V or 250V and I am fairly sure it was not line to neutral.

 

[SparkyChick]

British General. Fitted one last week, checked instructions... good to 500v, will result in 10 mega ohm reading (I'm guessing between line and neutral).

I say that because I only did LN to E (other gear on the circuit) and was getting in excess of 400 mega ohm.

 

[Green Sparkie]

British General. Fitted one last week, checked instructions... good to 500v, will result in 10 mega ohm reading (I'm guessing between line and neutral).

I say that because I only did LN to E (other gear on the circuit) and was getting in excess of 400 mega ohm.

Thank you beginning to think I was going mad !

 

[l4urence]

Personally, I remove the sockets and bypass with wago connectors. I don’t like it but I do like the readings! I think these damn things should have an isolator built in (operated from the front with a screwdriver) that disconnects the electronics. Where’s a good BS standard when you need one!