Does anyone use the UNI-T 528 test tool

Desmond Downs · Dec 17, 2022

I'm wondering if anyone has used this tool.
First of all I'm an automotive electrician but my work sent me on a PAT testing course and we have a DeltaPAT mi3309BT unit at work.
I was thinking of buying something cheaper like this tool just to experiment with at home. I am 8 years away from retirement and was thinking about the possibility of doing PAT testing as a 'semi retirement' job. At the current cost of testing items 10 an hour would earn me 1 1/2X my current hourly pay.
I don't want to spend 4X the money on a DeltaPAT which would sit gathering dust for 8 years - I could consider buying one when the day comes for retirement if I'm still going to do it but for now that money is better off going into my mortgage.
For now I'm thinking that this UNI-T tool would be useful to have around and experiment with. Does anyone use one?

[ElectriciansForums.net] Does anyone use the UNI-T 528 test tool

PenllŷnShan · May 12, 2023

Hi! I am a new PAT tester and use the UT528. It's simple to use and seems fine for everyday purposes like basic offices/holiday lets/caravans/nurseries etc...
It's battery powered so very portable , and lightweight too.
Some more experienced people seem to think it's "cheap chinese c**p", but it is working ok for me so far.
I find testing more complex items, like long extensions, adapters, and commercial large fridges a bit of a problem. It kept failing a chiller yesterday, yet an electrician today says it's passed for him without a problem. (I am a bitt suss of this though, as he is friends with the customer!)
So, that's my feedback! I'm happy , on the whole, but will upgrade when I can afford.
I am using the Kewpat app as well, so will probably go with one of their machines in due course.
Good luck! I am surprised how many people are looking for testers, and am making good money.

James · May 12, 2023

when you say it failed a chiller, what was the fault?
could it be that one or other of the testers is out of calibration?

PenllŷnShan · May 16, 2023

James said:
when you say it failed a chiller, what was the fault?
could it be that one or other of the testers is out of calibration?

Hi James, no my tester is new and was oly calibrated in February this year.

James said:
when you say it failed a chiller, what was the fault?
could it be that one or other of the testers is out of calibration?

davesparks · May 17, 2023

PenllŷnShan said:
It's battery powered so very portable , and lightweight too.

And presumably not capable of doing a proper bond test and any sensible level of current if it is only battery powered?

PenllŷnShan said:
It kept failing a chiller yesterday, yet an electrician today says it's passed for him without a problem.

Which test did it fail? What was the test result and was it close to the pass value or nowhere near it?

The test equipment can't decide whether something passes or fails, it is just a dumb machine, you, the person doing the testing, makes the decision based on the test results.

PenllŷnShan · May 17, 2023

davesparks said:
And presumably not capable of doing a proper bond test and any sensible level of current if it is only battery powered?

Which test did it fail? What was the test result and was it close to the pass value or nowhere near it?

The test equipment can't decide whether something passes or fails, it is just a dumb machine, you, the person doing the testing, makes the decision based on the test results.

Thanks
Am well aware decision to fail/pass is mine as the tester! However, without a reading to assess , hard to make that decision!
It failed the earth continuity test, just showed a straight fail, no reading, as if I wasn't getting an earth, despite using my "prong" on every available metal surface. I wondered if perhaps I needed to adjust for cable length in some way? I did replace the fuse in case that was the issue. The chiller was stored in a barn wrapped in plastic but was working when I plugged it in.
As a new tester, with just a basic test machine, I was merely asking for advice. I never pretend to be an electrician.
Cheers

James · May 17, 2023

PenllŷnShan said:
Thanks
Am well aware decision to fail/pass is mine as the tester! However, without a reading to assess , hard to make that decision!
It failed the earth continuity test, just showed a straight fail, no reading, as if I wasn't getting an earth, despite using my "prong" on every available metal surface. I wondered if perhaps I needed to adjust for cable length in some way? I did replace the fuse in case that was the issue. The chiller was stored in a barn wrapped in plastic but was working when I plugged it in.
As a new tester, with just a basic test machine, I was merely asking for advice. I never pretend to be an electrician.
Cheers

Was it definitely a class 1 appliance?

PenllŷnShan · May 17, 2023

James said:
Was it definitely a class 1 appliance?

It is a huge commercial type chiller with a 13 amp fuse in standard plug. Nothing to say Class 2 so tested as Class 1 as per my training. It had an earth wire attached to it's casing underneath, like you see outside houses sometimes attached to a rod? I assumed as most fridges and freezers are Class 1 this one would be too?

James · May 17, 2023

I would start by checking for the existence of an earth wire in the plug.
then look in the machine to see if it is terminated to anything.

davesparks · May 17, 2023

PenllŷnShan said:
It failed the earth continuity test, just showed a straight fail, no reading, as if I wasn't getting an earth, despite using my "prong" on every available metal surface.

If the tester just shows 'fail' and doesn't also give a measured value then I would say that the tester is not fit for purpose.

PenllŷnShan said:
wondered if perhaps I needed to adjust for cable length in some way?

It may that the test limits aren't set right in the tester, but without a measured value of resistance you cant really know.

PenllŷnShan said:
I did replace the fuse in case that was the issue.

But the fuse isn't part of the earth path being tested, you can pass an earth continuity test with the fuse removed.

PenllŷnShan said:
The chiller was stored in a barn wrapped in plastic but was working when I plugged it in.

That's a bit worrying to be honest, if an appliance fails testing then it should not be plugged in!

PenllŷnShan · May 18, 2023

James said:
I would start by checking for the existence of an earth wire in the plug.
then look in the machine to see if it is terminated to anything.

Definitly has an earth wire lol. What do u mean by terminated to anything?

James · May 18, 2023

PenllŷnShan said:
Definitly has an earth wire lol. What do u mean by terminated to anything?

What is the earth wire connected to a screw terminail?

PenllŷnShan · May 18, 2023

James said:
What is the earth wire connected to a screw terminail?

It was screwed via a tab at the end of the earth wire onto the metal frame of the chiller
Sharon

James · May 18, 2023

you should be able to measure earth continuity from this point to the 13A plug, if no continuity then replace cable.
however I am surprised that you would plug it in after discovering a fault in the earth.

PenllŷnShan · May 21, 2023

James said:
you should be able to measure earth continuity from this point to the 13A plug, if no continuity then replace cable.
however I am surprised that you would plug it in after discovering a fault in the earth.

I was unable to test the earth continuity...........my machine couldn't read it. Hence my query. I didn't plug it in, custmer insisted on doing so. And an electrician has apparently since been able to pass it. My query was why couldn't my UT528 test it? Was I doing something wrong, or was it outside my machine's capabilities?

Does anyone use the UNI-T 528 test tool

Desmond Downs

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PenllŷnShan

James

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PenllŷnShan

davesparks

PenllŷnShan

James

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PenllŷnShan

James

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davesparks

PenllŷnShan

James

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PenllŷnShan

James

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PenllŷnShan

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