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Specifically for AS/NZS 3760:2010 which I assume is similar for every other developed country.
What I want to know is: How can I test 3 phase 415V 32amp current leakage on a machine that is relay/soft start without an expensive secondary tester?
Acceptable earth leakage is under 5 mA.
Is this really as simple as making up a short "extension lead" with exposed earth wire (pic related) and measuring current across the earth with a clamp on ammeter while machine is running?
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>>1043612
yep, that's literally what you're testing.
personal opinions time: i don't think you can trust a clamp meter down in the single digits of milliamps.
also testing that way won't account for unintended earth paths like instrument wiring or buried rebar.
and i'm sure the leakage limit is allowed to be much, much higher than 5mA if a machine has a commando plug and a correctly sized earth conductor.
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Thanks.
I've been looking at "good brand" mA clamp meters for around $400 NZ which beats the $1500 adapter I was quoted.
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>>1043845
what the heck is wrong with directly connecting your meter?
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>>1043871
If there is some kind of earth fault it could be disastrous. It's doable but not the best idea
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>>1043949
>disastrous
oh come the fuck on.
literally the worst it could do is pop the meter's fuse, leaving the machine to operate unearthed for a few seconds before you can pull the plug.
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>>1044001
If there is a fault causing current to flow to earth and the meter blows then the machine and any tracks or slides it's sitting on or anything it's touching is live.
This is not good practice.
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