External Earth Fault Loop Impedance Ze Test - How to Remove Parallel Earth Paths

External Earth Fault Loop Impedance Ze Test - How to Remove Parallel Earth Paths - Live Testing

День тому

In this video me and Marcus show how to carryout an external earth fault loop impedance test on a single phase installation. All stage of this live test are demonstrated as well as the importance of removing parallel earth path created by incoming metal pipework such as the water and gas. This video is designed to help learners with testing and fault finding units in City and Guilds and EAL qualifications as well as AM2, AM2S and AM2E end point assessments for apprentice electricians.
🔵 Live Testing AM2 & AM2S - External Earth Fault Loop Impedance Ze, PEFC, PSCC on a 3 Phase Dis-Board • LIVE Testing on a 3 Ph...
🔵 Testing for External Earth Fault Loop Impedance (Ze) When You Have a Main Earthing Terminal (MET) • Testing for External E...
🔵 First Live Test AM2 & AM2S - Check Polarity of 3 Phase Supply, Using an Approved Voltage Indicator • First Live Test - Chec...
== 🕐 Time Stamps - Cut to the action 🕕 ==
00:00 - External earth fault loop impedance test
00:20 - Isolate the consumer unit
00:48 - Remove parallel earth paths
01:05 - Incoming water or gas could be metal
01:33 - Supply earth
01:42 - Remove the earthing conductor
01:50 - Alternatively you can remove from the MET in this case
02:12 - All out going circuit off during the test
02:48 - Top of the double pole switch is now live
03:01 - Setting up the Megger MFT
04:09 - Carrying out the Ze test
04:53 - Comments on existing installation
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 / gshelectrical
▶️ INSTAGRAM / brihzmraygdtmjmdb9lunq...
▶️ TWITTER / gsh_electrical
▶️ TikTok vm.tiktok.com/ZMRBLFdhe/
#GSHElectrical #Electricaltrainingvideos #electricaltesting

КОМЕНТАРІ: 31

@Dog-whisperer7494 2 роки тому

Great video. Nice and simple, with clear and easy to understand explanation. Fantastic video guy’s 👍👍👍❤️

@brianhewitt8618 2 роки тому

excellent guys, thank you

@ElectricEssenceLtd 2 роки тому

Great video

@jeremykemp3782 2 роки тому

great video thanks

@detroutspinners9933 2 роки тому

Great video, your content is so helpful for apprentices like me. Quick question, how would you perform this test on a sub main? Just R1 + R2 of the live and CPC going between both boards, and record it as Zdb?

@mounirdiab2938 2 роки тому

Great content as always, what's the purpose of measuring Ze and Zs and what's the interpretation and remedial of a high reading of Ze or Zs.

@Bari_Khan_CEng_CMarEng 5 місяців тому

Great video, much appreciated

@GSHElectrical 5 місяців тому

Thanks 👍🏻

@edrobens5145 2 роки тому

During this test all short circuit protection between you and the local transformer has been removed apart from 100A incoming fuse, so do a risk assessment first. In reality the fuse/dist board may be in an inaccessible, unlit location or you may have to work from steps/platform. The double pole isolation switch may be in a different location and DURING SET UP this should be padlocked OFF.

@yanalnaghawai1872 7 місяців тому

Many thanks for the great videos,,, what is the maximum for T.T ??

@robertallen2151 3 місяці тому

21 ohms usually but maximum is 200ohm

@astonpowers911 2 роки тому

Hi where would I record this result on a test sheet

@obinnakalu1777 2 роки тому

Hello Admin @GSH electrical. Please I need your assistance with a power supply problem. 1. Please what are the causes of negative power factor registered on a MD meter for a distribution installation. 2. How can this be corrected.

@electricalservicesmaroc 2 роки тому

Top top

@GSHElectrical 2 роки тому

👍🏻

@Oufg103f 3 місяці тому

👍 shared 👍

@GSHElectrical 3 місяці тому

Thanks

@SeanyyBoy_ 4 місяці тому

How have you mimicked a TN-C-S without creating a N to PE fault?

@dansheppard2965 2 роки тому

Sorry if this is a dumb question, but why is it higher for TN-S than TN-C-S? I understand the difference between the earthing methods, I'm just not twigging why that might lead to a higher impedance being acceptable for TN-S.

@idumacata 2 роки тому

In TN-C-S the consumer have a grounding before the consumer panel. So the impedance is smaller.

@trojanhawrs4613 Рік тому

In a TN-S the earth is ran from the transformer separate from the neutral wire. The earth conductor will be a lower CSA (smaller) than the neutral which is why it has a higher resistance. The earth is not designed to carry current under normal operating conditions, it just needs to be large enough to ensure circuit breakers will operate in the event of a fault. In a TN-C-S the earth and the neutral are the same cable up to the fusehead. Since the neutral is required to carry current in normal operating conditions, it's sized appropriately and so should have a lower resistance than a TN-S earth. Since the TN-C-S uses protective multiple earthing, a higher reading might indicate a failure in the system.

@ramzg5402 2 роки тому

ًthanks

@GSHElectrical 2 роки тому

👍🏻

@stevehenke678 2 роки тому

Is that for testing ze Germans?

@Jim804 8 місяців тому

I still don’t get why the breakers have to be off. I know he mentions “It wouldn’t have that earth fault loop path” but you have the main switch off so I don’t see the reason behind it.

@blower1 7 місяців тому

The breakers don't have to be off to get a proper Ze reading, however they should be off as part of the isolation procedure (breakers off in sequence, then main isolator/switch off)