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Posted By Topic: PAT Testing Office environment

Jan 29 2020 11:27

Hi team,

I have been tasked with completing PAT testing in the office.

I have had a breeze through NZS3760 but finding it hard to determine whether or not computer monitors need to be tested? I have tested their associated leads ok, but not sure whether or not to leave plugged in to monitors as i don't want to risk damage.

Also same question for phone chargers?

Any link to a helpful document would be greatly appreciated.


Jan 29 2020 15:03

The first thing required by 3760 for doing such checks is relevant competence [2.2]. Clearly you don't have it. in which case, what you do won't cover anyone's bum; least of all whoever asked you to do the checks (they are the party responsible for assessing competence; this is just my opinion).

A monitor is within Scope; and so should be checked.

Same for a LV phone (or any other) charger.

The testing required will depend on the exact mature of the equipment. Your question suggests you fear damage, and I infer that you are worried about IR testing. If you do such testing using the approved & appropriate method (see Appendix E); no damage will be caused.

Most modern monitors - like many other sorts of equipment - have "soft" power switches; making IR testing not viable, and use of the alternative leakage test necessary.

Jan 29 2020 15:25

Thanks Alec.

You have such a way with words.

I shall go and study Appendix E.


Jan 30 2020 03:08

Monitors are the easy ones to do, they actually have an earth pin. It's also easy to confirm low resistance from earth pin to connector sheilds.

The power switch type is irrelevant. If the switchmode's electrical isolation can't handle a 1000 Volts then it's already busted equipment.


Jan 30 2020 03:10

*shields* rather.


Jan 30 2020 09:13

my last post may have come across as a put-down; which wasn't intended.
None of us can expect to be 'competent" at all aspects.

But working beyond competence leads to problems. Sometimes serious problems; as when "inspectors" with a PL that authorises them to do "inspection" get into specialist areas where they have little or no training or experience

The important thing is to recognise both what we are competent to do; and what we're not; and then to seek to gain additional competencies.

Which starts with asking questions. way better to seek advice than just soldier on and hope for the best.


Jan 30 2020 14:19

That's ok Alec.

Only trying to do the right thing and as you say, learn from my experience. I could easily just walk away and say "too hard", but you only get to do that so many times in your life before you end up pushing trollies.

Appreciate the advice.

Jan 30 2020 14:58

I presume you've found the bit [R3.1] about "live supply conductors joined together".
That's what makes it safe (other than for the likes of MoV-type surge protection).

The best way for an appliance is to have a specially-modified cord connector of the appropriate type, with A&N connected together. Plug the "test" connector into the plug / inlet of the appliance, and attach your test leads to the connector. If you just clip on to the pins, there's a risk the clip will slip off one of the pins.

For an installation, jumper leads are useful.