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PAT Testing Problems?!?!

 
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JimboMT



Joined: 30 Jun 2008
Posts: 3
Location: Gravesend, Kent, UK

PostPosted: Mon Jun 30, 2008 3:41 pm    Post subject: PAT Testing Problems?!?! Reply with quote

I do the PAT Testing for the firm I work for, however I have been having problems with a few pieces of equipment, does anyone know what the earth leakage is for general Power Supplies for any desktop computers? or anyone know where I can get them?!?

Jim
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Markb



Joined: 29 Nov 2007
Posts: 164
Location: UK

PostPosted: Mon Jun 30, 2008 4:00 pm    Post subject: Reply with quote

The bible for any PAT testing is the IEE Code of Practice for In-Service Inspection and Testing of Electrical Equipment ISBN: 0-85296-776-4

With regards to PC's Assuming that they are class I appliances (Denoted by the lack of Class II markings) the Maximum leakage value for Class I appliances is 3.5mA
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JimboMT



Joined: 30 Jun 2008
Posts: 3
Location: Gravesend, Kent, UK

PostPosted: Tue Jul 01, 2008 8:34 am    Post subject: Reply with quote

thanks for that, as you seem to understand it, is the limit the same with the TFT monitors that are transformer based between mains and device, as our PAT tester has passed the vast majority of monitors, however we have one brand of monitor (NESO LD588) which 80% of this particular brand have failed the pat test under the standard pass criteria that was factory set for the tester (Seaward PrimeTest 100), is this due to the Pat tester pass criterion or do various class 1 appliances have various pass/fail criterion?

Jim
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Markb



Joined: 29 Nov 2007
Posts: 164
Location: UK

PostPosted: Wed Jul 02, 2008 11:06 am    Post subject: Reply with quote

I have to say this and I mean no offence. The IEE Code of Practice states:
Quote:
Those carrying out the inspection and testing must be competent to undertake the inspection and, where appropriate, testing of electrical equipment and appliances having due regard of their own safety and that of others. What should be considered is that the 'danger' to be prevented, includes not just the dangers which may arise during the testing procedure to the tester and others, but also the dangers which may arise at a later date as a result of using equipment which has not been effectively tested.

The tester must have an understanding of the modes of electrical, mechanical or thermal damage to electrical equipment and appliances and their flexes which may be encountered in any environment.

Training must include the identification of equipment and appliance types to determine the test procedures and frequency of inspection and testing. Persons testing must be familiar with the test instruments used and in particular their limitations and restrictions so as to achieve repeatable results without damaging the equipment or the appliance.


From the questions that you are asking I have to query if you have all the necessary training to carry out the tests.

However. back to the question you asked. A monitor that has an external power supply is probably a Class III appliance in that it has a low voltage feed and does not need to be tested. You do however have to test the transformer. Firstly identify what the appliance type is. Remember if it does not have any Class II markings it has to be treated as Class I. If it is a Class II appliance, as it may have electronics in it, the only test you can apply is the Leakage test and it should have a maximum reading of 0.25mA. If it is Class I and Electronic, you would look to perform a 100mA Earth bond test with a maximum reading of 0.1ohm + Cable resistance (Often you will not have to make adjustments for cable as the results are well below the maximum) You would then omit the Insulation test and substitute a leakage test, which you would look for a maximum reading of 3.5mA. One note with PSU's. often you will find that there is no exposed metal that you are able to perform an earth bond test with (The screen on the low voltage side is not suitable) In these cases you can omit the earth bond test.

Here are some useful information sites.
http://www.pat-testing.info/index.htm Lots on useful info and advice
http://www.pat-training-dvd.com/ A firm that as well as running courses produce a DVD course. I did it and it was very good. Probably best if you have quite a good knowledge first.

Buy a copy of the IEE book I mentioned in my first post.

Good luck.
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JimboMT



Joined: 30 Jun 2008
Posts: 3
Location: Gravesend, Kent, UK

PostPosted: Wed Jul 02, 2008 11:22 am    Post subject: Reply with quote

I recently completed a PAT training course with a company in Watford, so I have had the relevant training in that degree, I am also taking the electrical safety and comfort of our company under my wing, again as that was part of the certification. So I understand the consequences etc that come with the electrical safety and dangers that are present. When I did my course, the trainer was also being monitored by a HSE Executive, So I would hope that the training he gave was relevant!

I am fully competent and understanding on the electronics side of things, unfortunately we couldnt afford a better PAT Testing device, which is why Im asking these questions. the One negative feedback I have on my training is that they never covered any particular topic thoroughly i.e. never went through IT equipment explaining what the limits are. we were given a general guideline of "Mains Lead Resistance". using the CSA of the cable and working out the resistance of such leads.

Continuing on with what the IEE policy states....

I have been trained in identifying the difference between appliances, the various classes and the testing frequencies. The testing equipment we are using is fairly new to us however I have spent approx a week of working hours studying the device, using it, and becoming familiar with it. I am also quite aware of my limitations and whenever I feel I am over my head, I get my IT Manager to take a look as well, and he most certainly is "competent" however these problems have got us stumped.

I have purchased and am awaiting delivery of the book you quoted on your first post and Im hoping this will have a bit more information to cover that of which the training course ommited.

Jim
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Markb



Joined: 29 Nov 2007
Posts: 164
Location: UK

PostPosted: Wed Jul 02, 2008 1:11 pm    Post subject: Reply with quote

No probs Jim. I had to ask the question, I hope you understand. If you wish to add an email address to your profile, I can send you a scan of a really useful reference card that I have to use as a quick reference guide. I laminated mine and keep it with me when ever I do tests.

Mark.
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hhcg00



Joined: 02 Dec 2016
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PostPosted: Fri Dec 02, 2016 2:06 am    Post subject: hhcg Reply with quote

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