Measuring Prospective Fault Current (PFC) at the Origin of a Single Phase Supply (Live Test)

Student training aid for the live test measuring prospective fault current PFC using a MFT Megger tester. Includes a full demonstration of how to measure PFC current. This test is shown being done under controlled condition in a college workshop. I measure both prospective short circuit current PSCC and prospective earth fault current PEFC and record the highest of the 2 readings.

= 🕐 Time Stamps - Cut to the action 🕕 ==

00:00 - How to carryout a PFC test
02:21 - Isolating the consumer unit
03:37 - Testing between line and neutral of the incoming supply PSCC
04:27 - Testing between line and the earth bar of the incoming supply PEFC
05:35 - Testing between line on top of my circuit breaker MCB and neutral
06:01 - Testing between line on top of my circuit breaker MCB and earth bar

Videos are training aids for City and Guilds (C and G) and EAL courses Level 1, 2, 3 plus AM2, AM2S and AM2E assessments.

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[clivemunns]

Great vids, they do just what it says on the tin.
Very helpful, thanks guys.

[deanpaterson]

All your videos have been instrumental in getting me through my 2365 level 3 - i've no doubt they will be of great value for my 2391-52 next week, thank you Gaz, your time and effort in making these videos is very much appreciated !!!

[johanburger]

Great video. Love the attention giving on when to select the 2 hi, 2lo, 3lo setting on the device. Probably the best video I have seen for this so far.

[jamesclark]

Great video its nice to see someone explain the reason for the test and not just the method.

[peanutpotion]

I thought Ze and pfc was done at the supply side of the breaker

[chrissmith]

Gary again great video and 'HBSH'.

[sparktouch-]

great explaination and very easily understood....!!! Much Appreciate...!!!!

[jimim]

Great video, really appreciated for my studying, thank you

[gazdkw]

Is it a requirement of initial verification to test on the load side of the breaker? I thought Ipf was only on the supply side of the main incoming?

[billyellis]

You left the main switch inside the consumer unit on, is this compulsory when doing the first test

[falconryforever]

Just to clarify, we dont measure the fault current, we measure resistance and the tester auto calculates it and shows it as result. You dont send 4-5-600A trough your tester.

[vsfivyh]

Hi
In psc test why do you put red wire on neutral main isolated why mix the wire. And earth wire which is acting as neutral
Went on line. Main idolater

Thank you

[laganas]

Hi, is this one of the tests that you have to take when doing the level 2 diploma in electrical installations? Or is this for the level 3 diploma? Thanks.

[Ethan-hbwl]

In the am2 do you need to do every circuit breakers or just the one

[Jakee_]

How come some people use 3 Lead test for this? Does it make a difference? E.G probs on L, N&E doing the PFC test

[milesmitchell]

On main breaker are u testing the incoming our outgoing supply?

[CommonInvesting]

brilliant videos as always, my tutor is talking about the 3 lead method being the one we should use when testing, is this correct? and what is it

[kamuts]

Hi Gary, how is it gonna clear any faults or short circuits if the current is way below the 6KA or 33KA? I know these are breaking capacity, hence it gives safety to the installation or equipments but how is it gonna rectify the faults? thanks

[braisov]

Hi. Congratulations for the videos. Please, if you are so kind, two questions:

What is the reason for the difference between the measured PFCs of the two switches, being in the same point of the installation? In the case of Line-PE [424-312A] and in the case of Line-Neutral [311-332A].

Would the measures be different with all the charges connected?

Thanks

[Sergey]

Very knowledgeable video, and without any water..
How would you calculate pfc ?Is it I=Uo/Zs ?