Prime Test 250

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Prime Test 250

Postby pattestni » Thu May 29, 2014 8:43 pm

I have a Prime Test 250 and when I test reel extension leads I am sometimes getting a reading of 0.30 giving a FAIL in earth continuity. Everything else may be ok just a Fail because of earth continuity. I have been told that this is common in this type of test equipment where you get a PASS or FAIL. Is this correct ? and if so what have others been doing to overcome this issue.
Graham Pattestni
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Joined: Thu May 29, 2014 3:49 pm

Re: Prime Test 250

Postby Alan Freeman » Thu May 29, 2014 9:52 pm


It all depends on the length and cross section of the cable.

1.5mm2 cable is 13.3mOhm/M so 2 metre length has a resistance of 26.6 mOhm. Then add the 10mOhm allowed for the terminal and it FAILS.
Alan Freeman
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Location: Bedford

Re: Prime Test 250

Postby Amy Lyons » Thu Jun 12, 2014 10:02 am

Hi Guys

As the PT250 is a manual tester it will not automatically calculate the limit for earth continuity on items with supply leads or extension leads. Seaward have introduced a handy app to help with this. Please see more information below.
Thanks and kind regards

Amy Lyons
Applications Engineer
Test & Measurement Division
Seaward Electronic
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Amy Lyons
Applications Engineer
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Joined: Mon Apr 23, 2012 2:40 pm
Location: Peterlee, UK

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