USB Sockets and the Issues Testing for Insulation Resistance (USB Socket)

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Күн бұрын

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 megohms 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
00:24 - USB sockets contain electronic components
01:21 - Connected USB socket
01:52 - Test at 250 volts DC
02:25 - Insulation resistance test between live conductors
03:30 - Disconnect a live conductor (line or neutral)
04:07 - USB socket in circuit
04:43 - Testing at 250 volts DC
06:42 - Disconnect the neutral
07:34 - Insulation resistance test L/E N/E and L/N
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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Пікірлер: 50

@davidroche6973 6 жыл бұрын

Great video, great help as always

@Fester_ 6 жыл бұрын

I have no idea, yet, of what an insulation resistance test is. I'm 47yr old gaining knowledge. Thanks again for a clear lesson. Happy New Year.

@GSHElectrical 6 жыл бұрын

Hi. Thanks for watching GSH Electrical

@zedman442 4 жыл бұрын

Great explanation. I wish manufacturing did switching USB outlets!

@curtisj2165 4 жыл бұрын

You are absolutely correct, stupid not having a switch

@rubberlegs15 6 жыл бұрын

Yay, same tester as mine! Very useful video. More and more inline electronics are slowly but surely being introduced into modern installations. Watch out for smart home technology, soon we'll all be spending lengthy periods testing. Informative stuff.

@GSHElectrical 6 жыл бұрын

Hi. Thanks for the support GSH Electrical 👍

@cglees Жыл бұрын

Yep. It’s only going to increase over time. They need to amend the regs to say IR testing is at 250v instead of 500v

@adhefferan2408 2 жыл бұрын

Good stuff. I appreciate all the videos!!!! Thanks

@GSHElectrical 2 жыл бұрын

Thanks 👍🏻

@craigspacie7048 6 жыл бұрын

Great video

@marcusbarritt91 5 жыл бұрын

Great video 👍

@kingofthetrowel1725 3 жыл бұрын

Nice one gaz,great information for even a non sparks like myself 👌👍 so when I get a sparks in to do my periodic test I must remember where I have the usb sockets and let them know 👍 obvs they will see them but suppose it will help to let them know , anything to help and make the job easier 😂👍

@iraqviva7670 3 жыл бұрын

Thanks for sharing great video

@adrianJUPANU 4 жыл бұрын

Amazing ! Love it

@britannic2000 6 жыл бұрын

Another great video if it was a periodic rather than disconnecting usb sockets or other items that would present a reading would you just test between live conductors together and earth thanks for posting these videos they will help many trainees

@GSHElectrical 6 жыл бұрын

Hi. The test you talk about is fine on a periodic inspection but no good on an initial verification when you are required to test all conductors. Thanks for the positive feedback all the best GSH Electrical

@markandrews8437 6 жыл бұрын

Excellent video we fit a lot of these usb sockets at work I did wonder how they tested them, can you tell me when you do an insulation resistance test on a rcbo do you have to disconnect the conductors from the rcbo first or can you leave them in like an mcb cheers

@kungfukingsocket7287 2 жыл бұрын

good video

@morgaj21 6 жыл бұрын

Another excellent video. As a non-professional, I can't help but wonder if industry should come up with a design solution to enable a full voltage test?

@GSHElectrical 6 жыл бұрын

Hi. Thanks for watching and yes the manufacturer should help resolve issues like this. All the best GSH Electrical

@ericthekingthekingtheking4842 6 жыл бұрын

Fantastic these videos and the guy doing the down lights in the other video, good to see real life situations and you explain it really well 👍

@rayc5079 4 жыл бұрын

You should have done, between the line and USB output for the insulation test !

@swytcha2448 2 жыл бұрын

Only coming across this now and this video is great! So just to confirm, when there are sensitive devices fitted off, ie USB socket outlets dimmers downlights fan controller etc…during a periodic test, we are able to test between live conductors and earth ? And this won’t damage this connected devices ?

@alunroberts1439 2 жыл бұрын

So if regs say test at double the expected voltage why do we test at 250v. Why not make USB charge sockets only work when socket is on. So we have to remove the socket test an refit my thinking is from back at college re fitting what if the screw cuts in just a bit on refitting the test results are far as am concerns are void. As testing should be don in the manner the installation is used. What possibly is there refitting the cable could be damaged against the back box or refitting the screw.

@leebrown3895 3 жыл бұрын

This disconnection makes a mockery of the testing order as when you put the socket back anything can come loose.

@alunroberts1439 2 жыл бұрын

Not just loos a damaged cable against a metallic back box. If she thing just comes loos dead testing R1 R2 reading would show it.

@Tselectricals 8 ай бұрын

Great presentation sir ❤❤❤❤

@GSHElectrical 5 ай бұрын

Thanks

@alvinashman6371 6 жыл бұрын

Great video, any chance of doing a video showing how to insulation resistance test a lighting circuit with impulse (touch) and dimmer switches connected to the circuit?

@GSHElectrical 6 жыл бұрын

Hi. These types of equipment need removing from circuit before testing. Easiest way is to put the line and switching line together in the same terminal of the switch so you don’t pass 500 volts through the dimmer. All the best GSH Electrical

@swytcha2448 2 жыл бұрын

What about the downlights connected ? Will these have to disconnected too ? During the test it be left in ?

@abscomm 5 жыл бұрын

Great video, but why do you have to screw the socket back into the box before testing? If you left it out then it would be a reminder to reconnect the neutrals.

@curtisj2165 4 жыл бұрын

You are right, i don't put the fronts back on until i have finished the test

@normanboyes4983 6 жыл бұрын

I wish the USB components were switched - cannot be beyond the wit of man to design and fit into that 'generous' bit of real estate that is the standard twin 13A socket. I fitted a rise and fall power strip (with USB sockets) to a kitchen island that is switched - very happy with that.

@cunning-stunt 5 жыл бұрын

A USB socket doesn't need to have it's own switch, why not just have say the right hand 240V socket switch the USB outlets at the same time? Unless I am missing something? Or why not a three position switch? Off, 240 socket on, and 240 socket on with the USB on.

@seandempsey7351 2 жыл бұрын

I have to wonder if there is any truth to the claim that a 500v test could damage electronic equipment? As JW has done a video showing how he tested a smoke alarm at 500v and 1000v and the smoke alarm still worked as intended, also Nick Bundy had done a video showing how he tested LED lamps and LED driver again at 500v and 1000v and yes they still work as intended. So is it not doubtful that the insulation resistance test could or will damage such equipment? But I have to agree it’s better to these line and neutral combined to earth or if possible remove such equipment from circuit. Great video as always Gaz 👍👍👍👍❤️

@user-md7re1jy1f 3 жыл бұрын

I have question for I wanted to change a lamp ,shut off switch but still low current coming finally I switched off the banel still low current coming last resort I swetched meter off then no current and changed the lamp what is the reason for that......

@raithwilson6845 2 жыл бұрын

im niceic .Heres a thought ,How do these sockets even comply?When is it acceptable to have any transformer permanently wired to a ring main for eg with no fuse in line taking it down or means of local isolation?

@gd-bq7em 5 жыл бұрын

So if it's an existing circuit you would leave it connected and would only test live and neutral combined to earth. how would you write this on the certificate if the boxes are just live to live and live to earth

@GSHElectrical 5 жыл бұрын

Hi. The box Live/Earth on BS7671 testing paperwork is for line and neutral together as they are live conductors to earth for the insulation resistance test... hope this makes sense Gaz 👍

@jaye8578 5 жыл бұрын

250v test or L+N - earth IR test

@peterfitzpatrick7032 2 жыл бұрын

So how da hell did these sockets get approval ? 🙄

@paultaylor4032 3 жыл бұрын

Why would you screw the cover back on the socket for full insulation resistance testing, it would seem sensible to me that if the cover is not screwed on when i do a visual check that I need to do something with that socket?

@topchannel1000 3 жыл бұрын

apparently IR is dangerous cover should be on

@topchannel1000 3 жыл бұрын

at least thats what i have been told when i did my training

@paultaylor4032 3 жыл бұрын

@@topchannel1000 IR testing sends a charge through the wire, the better the insulation the longer that charge will be stored in the wire even once the tester has been removed so yes it can be dangerous if there is a risk of someone removing the socket and holding the wires but as most of my Electrical work is done with the customer out of the house and the fact that i run a discharge through the circuit straight after I guess I deem the risk to be minimal - Equipment should be discharged (shunted or shorted out) for at least as long as the test voltage was applied in order to be absolutely safe for the person conducting the test.

@topchannel1000 3 жыл бұрын

@@paultaylor4032 yes I know I would not put the cover on for IR but they dit not allow me to do that when i was training

@Chris-hy6jy 3 жыл бұрын

I don't understand these daft USB sockets. Who in their right mind wants loads of permanently connected 5v power supplies all over their house. Until manufacturers start switching the USB sockets, I won't touch them.