Uploaded June 2026 | Updated September 2026, 1 week ago
In this video, we carry out an Insulation Resistance Test on a brand-new electrical installation using a multifunction tester.
You'll learn:
⚡ How to set your tester to the correct megohm (MΩ) range
⚡ Why we use 500V DC for insulation resistance testing
⚡ The minimum values required by the On-Site Guide and Guidance Note 3
⚡ How to prove your test leads are in good condition before testing
⚡ Why lamps, loads and electronic devices must be disconnected
⚡ The importance of leaving switches ON in the circuit but protective devices OFF
⚡ Why the earthing and bonding conductors must be connected during testing
⚡ How to perform the three required insulation resistance tests:
We also discuss how to interpret high insulation resistance readings, what a reading of +999 MΩ means, and why we would expect very high readings on a new installation.
Whether you're studying for your electrical qualifications, preparing for practical assessments, or refreshing your testing knowledge, this video walks through the process step-by-step.
🔔 Subscribe for more free electrical training videos youtube.com/c/GSHElectrical?sub_confirmation=1
== 🕐 Time Stamps - Cut to the action 🕕 ==
00:00 - Insulation resistance test
00:19 - What voltage
01:09 - Per checks
02:15 - Must be in place
02:50 - Electronic components
03:19 - Earthing and bonding
04:11 - Helpful image
04:40 - Carrying out the test
🔵 Do YOU Know What Happens to a Circuits Insulation Resistance When the Circuit Length is Increased? youtu.be/Ml95TFpchmA
Videos are training aids for City and Guilds (C and G) and EAL courses Level 1, 2, 3 plus AM2, AM2S and AM2E.
You can follow me day by day on Facebook, Instagram, Twitter and TikTok lookout for "GSH Electrical.
▶️ FACEBOOK facebook.com/gshelectrical
▶️ INSTAGRAM instagram.com/p/BrIhZmrAYGDTmjMdb9lUNQodMevqsbDDki3qpQ0
▶️ TWITTER mobile.twitter.com/gsh_electrical
▶️ TikTok vm.tiktok.com/ZMRBLFdhe
#GSHElectrical #Electricaltrainingvideos #electricaltesting
In this video, we carry out an Insulation Resistance Test on a brand-new electrical installation using a multifunction tester.
You'll learn:
⚡ How to set your tester to the correct megohm (MΩ) range
⚡ Why we use 500V DC for insulation resistance testing
⚡ The minimum values required by the On-Site Guide and Guidance Note 3
⚡ How to prove your test leads are in good condition before testing
⚡ Why lamps, loads and electronic devices must be disconnected
⚡ The importance of leaving switches ON in the circuit but protective devices OFF
⚡ Why the earthing and bonding conductors must be connected during testing
⚡ How to perform the three required insulation resistance tests:
We also discuss how to interpret high insulation resistance readings, what a reading of +999 MΩ means, and why we would expect very high readings on a new installation.
Whether you're studying for your electrical qualifications, preparing for practical assessments, or refreshing your testing knowledge, this video walks through the process step-by-step.
🔔 Subscribe for more free electrical training videos youtube.com/c/GSHElectrical?sub_confirmation=1
== 🕐 Time Stamps - Cut to the action 🕕 ==
00:00 - Insulation resistance test
00:19 - What voltage
01:09 - Per checks
02:15 - Must be in place
02:50 - Electronic components
03:19 - Earthing and bonding
04:11 - Helpful image
04:40 - Carrying out the test
🔵 Do YOU Know What Happens to a Circuits Insulation Resistance When the Circuit Length is Increased? youtu.be/Ml95TFpchmA
Videos are training aids for City and Guilds (C and G) and EAL courses Level 1, 2, 3 plus AM2, AM2S and AM2E.
You can follow me day by day on Facebook, Instagram, Twitter and TikTok lookout for "GSH Electrical.
▶️ FACEBOOK facebook.com/gshelectrical
▶️ INSTAGRAM instagram.com/p/BrIhZmrAYGDTmjMdb9lUNQodMevqsbDDki3qpQ0
▶️ TWITTER mobile.twitter.com/gsh_electrical
▶️ TikTok vm.tiktok.com/ZMRBLFdhe
#GSHElectrical #Electricaltrainingvideos #electricaltesting
