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Old 11-12-2018, 06:04 AM   #1
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Default Tt system

Just tried to get a reading of ze on a tt system but my meter is showing 211v and not to go further with the test. Ive checked the just the supply voltage in and seems fine(243v). Dont do many tt systems so s bit baffled by this. Any thoughts would be appreciated.
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Old 11-12-2018, 08:35 AM   #2
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Originally Posted by [email protected] View Post
Just tried to get a reading of ze on a tt system but my meter is showing 211v and not to go further with the test. Ive checked the just the supply voltage in and seems fine(243v). Dont do many tt systems so s bit baffled by this. Any thoughts would be appreciated.
Did you do a zs test was that acceptable?

Have you completed any other ze test in this house (I assume residential), how were those readings

In testing I always

CHECK MY TEST PROCEDURE, the number of times a faulty test is related to the operator in HIGH.

Check your leads, had this issue the other day, the lead was loose I was stupid and tried all kinds of things before checking the lead was fully inserted.

Check on a good outlet.

What is your ground resistance?
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Old 11-12-2018, 09:06 AM   #3
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Sounds like a British system.
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Old 11-12-2018, 11:07 AM   #4
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Sounds like a British system.
It is

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BS 7671 lists five types of earthing system: TN-S, TN-C-S, TT, TN-C, and IT. T = Earth (from the French word Terre) N = Neutral S = Separate C = Combined I = Isolated (The source of an IT system is either connected to earth through a deliberately introduced earthing impedance or is isolated from Earth.
From my understanding it is what we do in the states

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The alternative is to provide a local earth and convert to TT.
http://www.electrical-installation.o...and_IT_systems
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Old 11-12-2018, 12:38 PM   #5
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adam,
Please take a few minutes and fill out your profile.
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Old 11-12-2018, 01:08 PM   #6
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It is



From my understanding it is what we do in the states



http://www.electrical-installation.o...and_IT_systems
I was under the impression we mostly used TN-C-S in North America.

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