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Topic Title: ZE Testing
Topic Summary: I'm unqualified and ignorant, help!
Created On: 21 September 2008 03:31 PM
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 21 September 2008 03:31 PM
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ncoups

Posts: 8
Joined: 08 June 2007

Hello,

I'm an engineering apprentice, but my firm don't seem to be doing very much electrical work, which is what I signed up for. So I'm trying to teach myself some things, but can't find much on ZE testing.
Could somebody explain what it's for and how to carry it out. I understand that it's to check for earth at the supply, but thats as far as my knowledge on it goes.

Cheers
Nick
 21 September 2008 03:44 PM
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intrinsic4225B

Posts: 1623
Joined: 30 September 2004

The procedures for testing, including the measurement of Ze are described and illustrated in IEE Guidance Note 3 - Inspection & Testing, the 5th Edition of which is the current edition.

There is also some basic information in Section 10 of the IEE On-Site Guide, the 4th Edition of which is the current edition.
 21 September 2008 04:12 PM
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perspicacious

Posts: 7131
Joined: 18 April 2006

As Ross says, its all in here, treat yourself

Regards

BOD

http://www.theiet.org/publishi...esting-5th-edition.cfm
 21 September 2008 04:46 PM
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davyn1

Posts: 2843
Joined: 01 August 2004

i'm not a fan of NIC but there books are ok and the one on Testing,Inspection and certification is good ,have a look i think my new versions cost £25,same as the old one but nice pretty new colours(yes i'm sad)
or have you looked here
http://www.tlc-direct.co.uk/Book/8.1.1.htm

davy

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just because i'm paranoid doesn't mean theyre not out to get me

Edited: 21 September 2008 at 04:48 PM by davyn1
 21 September 2008 04:53 PM
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ncoups

Posts: 8
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tah very much
 21 September 2008 05:02 PM
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davyn1

Posts: 2843
Joined: 01 August 2004

you are ever so welcomefrom all of us
i should realy stop drinking
davy

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just because i'm paranoid doesn't mean theyre not out to get me
 21 September 2008 05:33 PM
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naughtymoose

Posts: 456
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Don't do that Davy.

That would be silly!
 21 September 2008 07:16 PM
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sparkingchip

Posts: 5829
Joined: 18 January 2003

Ze testing calculates how much current will flow to earth in the event of a fault and weather the protective devices will operate.

That is if you took the live and shove it onto the earth connection is the flash and bang big enough to blow a fuse.

It is a very important test not carried out by DIY electricians, so you will not find it in DIY books, but any electrical text book will have reams on it.

Andy Betteridge
 21 September 2008 10:08 PM
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moorhouj

Posts: 58
Joined: 14 May 2007

It is actually the "Earth Fault Loop Impedance" which is why it lets you calculate how much current will flow to earth, (provided you also know the impedance/resistance of the earth loop of the circuit you are interested in [R1+R2]) - its importance is that
a) it tests the effectiveness of your earth
b) it is a factor in determining whether your protective devices (circuit breakers and fuses) will operate fast enough

Jack
 21 September 2008 11:34 PM
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Testit

Posts: 2962
Joined: 06 August 2007

Your best bet is to get yourself a multitester (a megger or fluke one for part P testing) and the inspection and testing book from the NIC then practice on your own install at home.. make some mock ups etc...

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