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Topic Title: Zs on a single circuit Topic Summary: How do i measure the Zs of a single circuit. Created On: 01 February 2013 01:57 PM Status: Post and Reply |
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 01 February 2013 01:57 PM
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Can anyone please explain to me how to measure the Zs of a single lighting circuit ? not the whole installation. thanks!
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01 February 2013 02:21 PM
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Find the end (or worst favoured branch) and measure from there if you want a live test direct reading with a EFLI tester
Or do the same by measuring the relevent phase and CPC dc resistance and calculate it with knowledge of the impedance external to the installation. Or calculate it from knowledge of the cable size and length and again with knowledge of the external impedance. Regards OMS ------------------------- Failure is always an option |
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01 February 2013 06:00 PM
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The third option mentioned by OMS should be used in combination with either of the other two options mentioned.
------------------------- Regards Dave(not Cockburn) |
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01 February 2013 06:22 PM
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Wow.
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01 February 2013 06:29 PM
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Can anyone please explain to me how to measure the Zs of a single lighting circuit ? Measure R2 at light switches and at lighting points, to determine the worst case for the circuit, take this highest value and either test there for Zs or use in the calculation. Regards |
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01 February 2013 06:45 PM
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I don't quite know why you need to measure the Zs if you dont know how to do it? What i'm trying to say is that a Zs figure is only normaly used by an electrician to check the safety of a circuit!
Dave. |
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01 February 2013 11:14 PM
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Wow. Good init! 
------------------------- Regards Martyn. Only a mediocre person is always at their best www.electrical contractors uk.com |
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01 February 2013 11:33 PM
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JBrown123
Welcome to the forum. Is this a test question you have been asked to answer by your college lecturer for Monday morning? If so we may need to give you a different answer to stop you falling in to an evil trap set by a wicked person. Lecturers of course don't live in the real world but some sort of academic lah lah land! Dooh I might have just shot myself in the foot. ------------------------- John Peckham http://www.astutetechnicalservices.co.uk/ |
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02 February 2013 07:26 PM
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Presuming L follows the same route as PE ... which isn't necessarily the case for a lighting circuit 
- Andy. |
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04 February 2013 01:19 PM
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measure Zs? with a tape measure...:-) Gives me the distance to avoid the curled up hand hurtling towards my arm.....
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04 February 2013 03:17 PM
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Hes just lost three points for calling the line conductor a phase conductor. |
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Zs on a single circuit
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