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Topic Title: Ze Testing on Motor
Topic Summary: Single phase Testing
Created On: 05 February 2016 01:08 PM
Status: Read Only
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 05 February 2016 01:08 PM
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AaronnT

Posts: 7
Joined: 05 February 2016

I am shortly sitting the inspection and testing exam in level 3, and would like some experienced advise of how to test ze on a motor, which is on a single phase mock board in college, any easier way to go about it would be apreciated. Many thanks.

Aaron.
 05 February 2016 01:31 PM
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perspicacious

Posts: 7854
Joined: 18 April 2006

Welcome Aaron

Do you mean Zs?

Regards

BOD
 05 February 2016 02:07 PM
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AaronnT

Posts: 7
Joined: 05 February 2016

Thanks, My mistake, yes its the Zs im after, Aaron.
 06 February 2016 09:32 PM
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dg66

Posts: 1712
Joined: 11 January 2008

Carry out an R1 + R2 test at the motor terminals (dead test) & add to your Ze (live test) As far as im aware there has never been a requirement to carry out a live Zs test

-------------------------
Regards

Dave(not Cockburn)
 06 February 2016 09:52 PM
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leckie

Posts: 4323
Joined: 21 November 2008

Ah ha! That's what I assumed by your post last week regarding the need for a Zs test. But you omitted the word live. What we are required to do is to verify the max Zs. R1+R2 +Ze is fine.

Regarding the OP, that is the way forward. But you might have to short out the starter terminals of the line conductor first.
 06 February 2016 10:02 PM
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dg66

Posts: 1712
Joined: 11 January 2008

Small single phase motor probably wont have a starter

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Dave(not Cockburn)
 06 February 2016 10:27 PM
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leckie

Posts: 4323
Joined: 21 November 2008

It would have to be very small! The OP doesn't mention that bit

Ok, IF it has a starter, short out the line.
 07 February 2016 11:18 AM
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Jaymack

Posts: 5357
Joined: 07 April 2004

Originally posted by: AaronnT
I am shortly sitting the inspection and testing exam in level 3, and would like some experienced advise of how to test ze on a motor, which is on a single phase mock board in college, any easier way to go about it would be apreciated. Many thanks.

Carry out a Zs test at the incoming terminals of the un-switched motor starter, and add R1 + R2 for the dead test on a motor winding.

Regards
 07 February 2016 02:02 PM
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AaronnT

Posts: 7
Joined: 05 February 2016

Thanks all, much apreciated.

Aaron.
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