Comments on: Grounding outside https://www.epanorama.net/blog/2009/07/11/grounding-outside/ All about electronics and circuit design Wed, 08 Apr 2026 15:02:51 +0000 hourly 1 http://wordpress.org/?v=3.9.14 By: Tomi Engdahl https://www.epanorama.net/blog/2009/07/11/grounding-outside/comment-page-1/#comment-1707708 Tue, 06 Apr 2021 08:05:07 +0000 http://www.epanorama.net/blog/?p=251#comment-1707708 Earth Terminal Voltage Drop TN-C-S
https://www.youtube.com/watch?v=iozyjrPmY7U

How the earth terminal on a TN-C-S supply can be at a different voltage to the true Earth.

As the neutral and earth conductor are combined outside the installation, current in the neutral causes a voltage drop, which results in the earth terminal having a different potential (voltage) to the true Earth outside.

]]> By: Tomi Engdahl https://www.epanorama.net/blog/2009/07/11/grounding-outside/comment-page-1/#comment-1627734 Tue, 05 Mar 2019 10:31:59 +0000 http://www.epanorama.net/blog/?p=251#comment-1627734 Grounding – Ground Resistance Measurement, 250.53(A)(2) (26min:27sec)
https://www.youtube.com/watch?v=Yg6G5VUSsWA

This real world test will be conducted by Nationally recognized Code Expert Mike Holt and electrical utility professional Joe Symmes using a 3 pole fault potential method, a clamp on meter to check the ground, an Amp meter to measure the current flow in the event of a ground fault and a volt meter and also test the test potential.

]]> By: Tomi Engdahl https://www.epanorama.net/blog/2009/07/11/grounding-outside/comment-page-1/#comment-1627127 Thu, 28 Feb 2019 12:12:46 +0000 http://www.epanorama.net/blog/?p=251#comment-1627127 2017 NEC – Equipotential Bonding [680.26], (20min:51sec)
https://www.youtube.com/watch?v=wyOILpoR39A

Swimming Pool Equipotential Bonding 1 of 3 Stray Voltage, (1hr:34min:27sec)
https://www.youtube.com/watch?v=pAs_FmdxXhQ
Swimming Pool Equipotential Bonding 2 of 3, NEC 2014 – 680.26, (19min:50sec)
https://www.youtube.com/watch?v=j7r1UyuIgss
Swimming Pool Equipotential Bonding [Part 3 of 3, Testing], (28min:39sec)
https://www.youtube.com/watch?v=Q8YLcXRo-Go

]]> By: Tomi Engdahl https://www.epanorama.net/blog/2009/07/11/grounding-outside/comment-page-1/#comment-1626789 Tue, 26 Feb 2019 10:44:03 +0000 http://www.epanorama.net/blog/?p=251#comment-1626789 Pretty simple rule: Neutral is connected to ground ONE PLACE per system. That place is where the system begins (meter, or transformer).

]]> By: Tomi Engdahl https://www.epanorama.net/blog/2009/07/11/grounding-outside/comment-page-1/#comment-1626788 Tue, 26 Feb 2019 10:43:37 +0000 http://www.epanorama.net/blog/?p=251#comment-1626788 Grounding – Objectionable Current, NEC 2014 – 250.6 (29min:14sec)
https://www.youtube.com/watch?v=M3lX4XtlYXk

]]> By: Tomi Engdahl https://www.epanorama.net/blog/2009/07/11/grounding-outside/comment-page-1/#comment-1625390 Thu, 14 Feb 2019 10:09:05 +0000 http://www.epanorama.net/blog/?p=251#comment-1625390 Earth Fault Loop Impedance Test & Prospective Fault Current Test
https://www.youtube.com/watch?v=_twVvsGo81A

Trade Skills 4U tutor Andy Summers talks you through earth fault loop impedance and prospective fault current testing.

]]> By: Tomi Engdahl https://www.epanorama.net/blog/2009/07/11/grounding-outside/comment-page-1/#comment-1625203 Wed, 13 Feb 2019 13:48:47 +0000 http://www.epanorama.net/blog/?p=251#comment-1625203 External earth loop impedance (Ze) test
https://www.youtube.com/watch?v=PUTn3t65na4

For many installations the resistance of the earth electrode can be measured using an earth fault loop impedance test instrument.
This test is explained in the video.

Loop Impedance
https://www.youtube.com/watch?v=HsWWKzjVUxE

Loop impedance, why it matters and typical values.

]]> By: Tomi Engdahl https://www.epanorama.net/blog/2009/07/11/grounding-outside/comment-page-1/#comment-1625077 Tue, 12 Feb 2019 12:42:39 +0000 http://www.epanorama.net/blog/?p=251#comment-1625077 https://www.rockymountainpower.net/content/dam/rocky_mountain_power/doc/Efficiency_Environment/Net_Metering_Customer_Generation/RMP_Interconnection_Effective_Grounding_FAQs.pdf

]]> By: Tomi Engdahl https://www.epanorama.net/blog/2009/07/11/grounding-outside/comment-page-1/#comment-1625068 Tue, 12 Feb 2019 11:56:47 +0000 http://www.epanorama.net/blog/?p=251#comment-1625068 Grounding Mats for Step and Touch Voltage Protection
https://www.youtube.com/watch?v=xebKs-SIQmM

Originally presented at the 2015 Purdue Underground Corrosion Short Course, this video covers the essentials of using gradient control mats to address over-voltage concerns from touch and step potentials.

]]> By: Tomi Engdahl https://www.epanorama.net/blog/2009/07/11/grounding-outside/comment-page-1/#comment-1625067 Tue, 12 Feb 2019 11:51:50 +0000 http://www.epanorama.net/blog/?p=251#comment-1625067 The Megger DET14C and DET24C Clamp On Meters
https://www.youtube.com/watch?v=ceP4Kf2MHXA

DET Earth/Ground Clamp-on Testers

The new DET14C and DET24C are advanced new earth / ground clamp-on testers that set new standards in terms of access, features, simple operation and safety.

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