Insulation Resistance on USB Socket Circuits
Students training aid for testing insulation resistance. Demonstration shows how an insulation resistance test could damage a USB socket outlet and how to overcome this. Test voltage is 500V DC and the minimum acceptable value according to BS 7671 is 1 megohm for the whole installation with further investigation when the reading falls below 2 megohms.
Note a 3 lead low earth fault loop impedance test will pickup if you have forgotten to reconnect either the line(s) or neutral(s) of the UBS socket outlet.
🕕 Time Stamps - Cut to the action 🕕
00:00 - USB socket outlets
00:27 - What do the manufactures say
01:07 - Between live conductors
02:28 - Proving the point
03:10 - Testing at 250 volts DC
03:43 - Didn't trip
04:31 - Disconnect the neutral
05:07 - Insulation resistance test
Videos are training aids for City and Guilds (C and G) and EAL courses Level 1, 2, 3 plus AM2, AM2S and AM2E.
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