Proving Your Neutral Electrical Connections

[GB.Kayak]

If I'm measuring a Zs, I'll usually do the Z(line) at the same time; it's an easy check that there's a decent neutral connection. It's just another button to push on the MFT if you've got three test leads connected already.

(BTW, what's the proper symbol for line impedance?)

Nowt in BS 7671 on the subject of the Line-Neutral impedance ... another sign in my book, that the regulations focus so much on the safety function of an installation so as to leave a gaping hole in the safety of the functional purpose of an installation, to distribute power!

 

[GB.Kayak]

flex_m ... really, you let the side down there, what do they teach on these courses ...

 

[Leesparkykent]

Deleted.

 

[GB.Kayak]

Deleted.

Lee ... deleted ... intrigued!

 

[Leesparkykent]

Lee ... deleted ... intrigued!

I wrote something then edited it a few mins later then it come up I wasn't logged in so I just deleted it as couldn't be bothered to write it out again lol.

 

[GB.Kayak]

I wrote something then edited it a few mins later then it come up I wasn't logged in so I just deleted it as couldn't be bothered to write it out again lol.

LMSO! I get pretty frustrated ... I have lost a number of well penned 'thoughts for the day'. I now copy the text to an iPad note if I get the ominous 'you do not have permission ... ' message!

 

[Octopus]

If I'm measuring a Zs, I'll usually do the Z(line) at the same time; it's an easy check that there's a decent neutral connection. It's just another button to push on the MFT if you've got three test leads connected already.

(BTW, what's the proper symbol for line impedance?)

Does this mean your MFT will allow you to do a Zs without a N connction? My Metrel won't

 

[Des 56]

Does this mean your MFT will allow you to do a Zs without a N connction? My Metrel won't

Never having owned a metrel I ask because it is surprising
3 lead test,neutral and earth leads are shorted what is the outcome ?

 

[Leesparkykent]

LMSO! I get pretty frustrated ... I have lost a number of well penned 'thoughts for the day'. I now copy the text to an iPad note if I get the ominous 'you do not have permission ... ' message!

Lol yes It's very frustrating when it happens, I normally copy and then paste it when I log back in but It didn't seem to work that time.

 

[spark 68]

Does this mean your MFT will allow you to do a Zs without a N connction? My Metrel won't

Cannot comment on the Metrel

My Megger requires the N for the No-trip test (three lead test) on the Hi-current test the N and E leads are connected together (effectively a two lead test), for testing ZP-N the Hi-current test would suffice because this would not trip any RCD.

 

[HandySparks]

Does this mean your MFT will allow you to do a Zs without a N connction? My Metrel won't

Yes, it only requires all three leads for the 'no trip' Zs. The full current Zs and the Z(line) tests only need two leads. However, I usually connect all three leads and do both Zs and Z(line) together.


Edit: Fluke 1652C