[Question] Neutral impedance

[Mellet L]

Good afternoon.
Can somebody please explain the new COC document with relation to neutral loop impedance and how are we to test for it??
I know how to test for the Earth loop impedance using the T1825 meter, but how do we test for neutral impedance?? Please help.
Thanking you kindly

[AndyD]

PEFC test will give you earth loop impedance, PSCC test will give you neutral loop impedance. On a TN-C-S or PME'd supply these test results should give identical results.

[Derlyn]

Brother

What I do, using the same impedance tester as you, is to swap the earth and neutral leads. ie. connect the black lead to earth and the green lead to neutral.

You will then be doing a neutral impedance test, but as Andy said .... The readings should be identical.

Maybe some of the other toppies can comment.

Peace out ... Derek

[GCE]

Came across 1 - New-Neutral-Loop-Impedance-Test-SANS-10142-1-Ed-3.pdf this article this morning and remembered the thread on Neutral impedance

NOTE 1 For this test using the same instrument as per 8.6.5.1, both the
neutral and earth clamps of the instrument will be connected onto the
neutral conductor

[Lindley]

Came across [ATTACH]8171[/ATTACH] this article this morning and remembered the thread on Neutral impedance

NOTE 1 For this test using the same instrument as per 8.6.5.1, both the
neutral and earth clamps of the instrument will be connected onto the
neutral conductor

thats correct!Also have it like that did unit standards early this year where they also instrcuted us to do it in that manner.

[ians]

OR just buy a decent meter like a fluke 1654 ?

[Lindley]

OR just buy a decent meter like a fluke 1654 ?

It has been discontinued!Great meter worked with 1 few months ago!

[Derlyn]

I remember the thread on neutral impedance where I advised someone to swop the earth and neutral leads to get the neutral loop impedance.

I was wrong.

Please accept my humble apologies.

Connecting both the earth and neutral leads to the neutral is of course the correct method.

Peace out .. Derekk

[ians]

Yip us old people who look after our equipment ...dont keep up to date with the latest trends ... there is already a 1664 FC ... at only R482000.00 ... trying to justify that kind of outlay doing COC's at R600 could be a challenge

https://www.fluke.com/en-gb/product/electrical-testing/installation-testers/fluke-1664-fc

[Derlyn]

Ian. I still have an AVO meter that gets used regularly.

I also prefer an old analogue megger. Needle to the left .. good. Needle to the right .. bad.😆

[Derlyn]

Yip us old people who look after our equipment ...dont keep up to date with the latest trends ... there is already a 1664 FC ... at only R482000.00 ... trying to justify that kind of outlay doing COC's at R600 could be a challenge

https://www.fluke.com/en-gb/product/.../fluke-1664-fc

Aren't there too many zero's in that price ?

I almost had an angina attack.

[adrianh]

The real price ranges between R20k and R48k

https://www.ebay.com/p/27013589552?mkevt=1&mkcid=1&mkrid=711-53200-19255-0&campid=5336728181&customid=&toolid=10001

https://octopart.com/flk-1664fc+sch-fluke-73855888

https://www.testequipmentdepot.com/fluke/pricelist.htm

[ians]

Aren't there too many zero's in that price ?

I almost had an angina attack.

Yip ... only Dave can edit mistakes ... as my wife always tells me ... my mind ticks over at a rate my fingers cant keep up ... I am already on the 3 third sentence by the time my hands have typed what I have already forgotten ... and they say technology is so smart ... it cant even get the grammer and spelling right

[ians]

A scary thing to note ... I spent R150k about fluke test equipment ... I was told the reason the price was so expensive in SA because of the support ... blah blah blah.

Back then ...I could have taken a holiday to the USA ... had a week holiday or completed the training for the equipment and still had money in my pocket when I got home.

[Dave A]

Yip ... only Dave can edit mistakes ...

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