USB sockets testing

loplug · Mar 17, 2019

does anyone test these in any way if so what do you use. Or do you just test the 13a sockets and make an assumption that the usb skts are working ?

Toneyz · Mar 23, 2019

Strima said:
Some do, some don't.

Do I take it then a 500v test to earth is safe but between L and N could not be.

Strima · Mar 23, 2019

anthonybragg said:
Do I take it then a 500v test to earth is safe but between L and N could not be.

You'd need to check what manufacturers state for their accessories. If unsure then just do L&N to E.

Shoei · Mar 23, 2019

I quoted from the 17th but it's different in the 18th. Table 64 on page 232 specifies minimum insulation resistance of 0.5 MΩ at 250V DC. 643.3.3 recognizes that some electronics may be damaged by test voltages, and allows a limited test.

These are tests before circuits are energised so for practical purposes it may be worth chopping a USB lead, shorting all four wires together and test USB-live and USB-earth. Shorting the USB pins together should protect the electronics against damage, and if it is damaged by that it's not fit for purpose.