Electrical Capstone Practical Exam Fault Finding -Insulation Resistance

Tutorial and tips on fault finding for Insulation Resistance.
Errors: 8:33 and 8:55 I mention 'Protective' Earthing on RCDs I meant to say 'FUNCTIONAL' Earthing.

Set Megger on 500 V
Any electrically sensitive equipment needs to be tested on 250V. This includes equipment containing surge protective devices connected to earth, EMC Electromagnetic compatibility Filters and other sensitive equipment. You may disconnect Sheathed heating elements or RCD with FE connection (RCBO's).

TEST YOUR VOLTAGE RANGE
This needs to be between -10% to +20%
So on 500V your voltage reading needs to be within 450V to 600V.
How do you test this? Find your 1M ohm resistor tester. Hook up your meggar to test 1M ohm leave this set up and then test voltage with your multimeter to read how many volts are actually going through that 1Mohm resistor. You need to get a reading between 450-600V on a Meggar @500V

INSULATION REISTANCE VALUES
New Installations -Greater than 50M ohm
Existing Installations -Greater than 1M ohm
Heating Elements -Greater than 0.01M ohms
Functional Earthing -Greater than 0.05M ohms

[woodsy]

Someone get this women a slab .thanks for all the help!

[goodvibes]

Excellent Niki great effort making yourself a prop board a great resource for all the new sparkies entering the work force plenty of good tips 👍all the best for the future from someone who was an apprentice in 1975 😊

[animekingz]

Keep the videos coming, a great insight into what happens in capstone. Keep up the great work

[shaquilleoakley]

These are really helpful heading into my Capstone in 3 months! Thanks a lot

[hk.l]

Oh wow, this video is great! I'll be doing my capstone next year in November. Will be using these videos to revise.

[aqeelmir]

Really great video . Love from the uk ....

[qiangzheng]

Great, so useful, thank you so much, from UK

[paterson]

Ps, great video. Good to see the process. I'm from railway signalling and learning electrical A grade

[dimitarmilojkovski]

I got my capstone tomorrow If I pass it will be from you Thankyou !!

[snappaclappa]

Why do you disconnect the main Neutral?

[patconnaughton]

Great video, can you also talk about 2 way switches and 3 way switches

[lennyg]

In AS/NZ 3017:2007 they have a IR test for complete installation…. Could you explain how that works? I’m confused on why it only test earth to neutral bar ?

[warrenkelly]

How did you check IR on sub mains gain? you removed the nuetral, then nuetral to earth? then active load to earth. And neutral you removed to active on load side?

[warrenkelly]

Hi are you able to tell me how you do the IR on the whole installation at the board?

Secondly, how do you do a short cct test? thank you

[warrenkelly]

Hi thanks for getting back to me quick. I dobt know why Inqueationed about the sub mains lol.

My second question. Why do you test on the load side of the MS when testing consumer mains? does it matter if we test from the line side ad well? I would imagine teating on the load side, you're sending voltage down to the sub circuits as well? thanks

[warrenkelly]

the 3 phase switch on the right had side you check your consumer mains, Is that the main switch? and the CB you check your submains on the left, is that CB meant to be your service fuse?

[paterson]

Is there not a requirement to test the active and neutral against each other to ensure that there isn't a fault between them? I thought you would have to test each and every combination, ie earth to active, earth to neutral, active to neutral. If not, how can you be sure that there is no possibility of a short or partial short between them. The insulation may have degraded between them but not show up when testing to earth as the earth insulation could still be perfect.

[Askfordannygyeah]

I have a question.
When testing your 'consumer mains' how is it possible to do that. If the consumer mains has power to it and your testing it with your IR tester wouldn't that technically blow up your IR tester?
From my understanding the consumer mains has a fuse out on the street so unless your actually disconnecting it out there i dont see how you could even test that without causing harm to the cable? cheers

[kylemailey]

Hi I been working as a ta and thinking of getting qualified, , , do you do one on one tutoring on your practice board?

[abemccluskey]

Are you sure you take the main neutral out?