How to Set up Your MFT and Measure Insulation Resistance

In this video we look at how you set up your Megger MFT tester to carry out an insulation resistance test on a 230 volt AC lighting circuit. Full demonstration on setting the scale on your Megger Multifunctional Tester (MFT) and the conductors that need to be connected in order to carry out this test correctly. We look at removing all loads priory to carrying out the test and the productions to take when the circuit has RCD protection. The test voltage used when carrying out this dead test on a circuit with a nominal 230 volts AC is 500 volts DC with a minimum acceptable insulation resistance of 1 megohm.
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[@93lornamae]

Hello. Is there a video on wire up and down control for a single and 3 phase roller door? Thanks. Almost no video online.

[@bohassan8037]

Thank you for this video But when test between IR dround and neutral In TNC system on TNC-S sytem or TNS system This allrady both conecte togther How get hight inslation between earth and neutral

[@avfczoff]

I understand the need to remove loads but what do you do if there’s 30+ downlights & a cooker hood or other appliance is plugged into a socket that you can’t access to unplug?

[@sonicstep]

Good question, especially for commercial installs.

[@neowild8102]

Just don't test that circuit and leave as it is lol. yes, Garry answer the question.

[@iancottingham4189]

Link line and neutral together and test to cpc. On a new install you must not do this but can on existing as EICR

[@avfczoff]

@@iancottingham4189 Thank you

[@gnamp]

Why if three readings are taken only two are recorded?

[@GSHElectrical]

Insulation Resistance Test (Includes Line and Neutral Together to Earth and Between Live Conductors) kzbin.info/www/bejne/e5yUpmWIn7aZnLc This should help 👍🏻

[@gnamp]

@@GSHElectrical it does. Thanks

[@awt]

I am fascinated by why "megohms" is considered correct. "Mega" is the SI prefix, "ohms" is the SI unit, so it's surely "megaohms". I can (sort of) understand that it's sometimes pronounced "megohms", but why is it _incorrect_ to say "megaohms"?

[@sonicstep]

Not wrong. Mega = 1x10^6 = 1,000,000 of anything in the millions. Dropping the leading vowel 'a' to form Megohm is a derived North Americanism. Similar to referencing an oscilloscope as simply a scope. Both are understood to be correct. Just that saying scope is less cumbersome and quicker to say.

[@awt]

@@sonicstep but we aren't talking about vernacular naming here: the IET and BS7671 use the term "megohms".

[@kobbyson-m1y]

😍😍

[@colinhursell9176]

If the meter simply reads >999 then there is no real indication/check that the probes are connected properly...