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Electrical Earthing System Design & Soil Resistivity Testing

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EN 50522

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Earth Testing Procedures in Urban Environments

Electrical earth testing can be a real challenge in built-up areas. Not only are there very few soft areas to deploy the test probes, but underground cabling and conductive structures are everywhere. These two factors massively affect the measured readings leading to measured values that bear no relation to the actual electrode tested.  Therefore, what follows is the Earth Testing Procedure Greymatters adopts.

Step 1

Follow the guidance in HSG47. The city or town’s infrastructure produces large amounts of in-ground noise and interference. Mitigation by reading buried service/cable records; observing signs of previous excavations; and use a cable avoidance tool (CAT) can make sense of where the structures are.

[Read more…] about Earth Testing Procedures in Urban Environments

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Earthing Calculations for Safe System Design

Earthing Calculations regarding your safety – you’re overdue an update!

If 1-ohm is still in circulation on your documentation then this section applies to you.

Even though the Earthing Calculations for determining a safe System Earth (Ground) has shifted away from an arbitrary resistance figure, usually <1 ohm.  It’s still all too common to see this outdated measure of installed success appear on client/employer requirement specifications(ER’s). As part of the Earthing Calculations Design Safety brief.

[Read more…] about Earthing Calculations for Safe System Design

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A Round-Up of The 10 Most Read Posts of 2016

Well, 2016 was an exciting year for the team at GreyMatters. So, at the end of 2015, we set goals on what we wanted to achieve in 2016. Part of the plan was to focus on establishing this blog channel as an authority on Electrical Earthing Design and Lightning Protection.  Something that can be referred to and although some of the concepts are considered complex, the style of writing is hopefully easy to read and informative.

This post is a round-up of the ten most read posts of 2016, and interestingly not all of the most read posts are initially published in 2016 (you may have missed it). [Read more…] about A Round-Up of The 10 Most Read Posts of 2016

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How to avoid a stay at “Her majesty’s pleasure” Inspect your Electrical Earthing System

So you’ve had your Electrical Earthing System designed by a professional, installed diligently by a competent contractor and had it verified to confirm the Earthing will protect lives in the event of a fault!  – Job done, right?

Nearly… but the story doesn’t stop there! [Read more…] about How to avoid a stay at “Her majesty’s pleasure” Inspect your Electrical Earthing System

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50 Shades Freed – Unleashing CDEGS!

During my previous blog, where we explored the analogy of the car when comparing to Earthing Studies using CDEGS – if your project is a high value, critical asset, and/or infrastructure effecting large populations – then this is likely to require a more demanding level of performance in the foundational design data. [Read more…] about 50 Shades Freed – Unleashing CDEGS!

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