Inspection and testing - analysing the results of LIVE tests - A SparkyNinja webinar 

fantastic again. so much ability to learn in this, and you guys are so kind to put this up for free. Thank you.

These are most certainly wanted! Great stuff.

Thank you for this great content.Initially I was put off by the length of these webinars,but I am so glad i persevered and watched them.Well done to you both

Looking at GN 3 Have you got a typo @30:47, Power point states Zs of 1.75 for a 16 A Type B Should that not be either a 20 A BS EN 60898 or the Figures Changed to match?

thankyou for this I agree on Zs readings I work on a marina and we were recently tested and after some investigation as we couldn't get a Zs even though dead test good as was Ze. Tracked to a fault on a boat with the vessel unplugged Zs good eventually tracked to oven and water heater timer each leaking 20ma to earth even stranger all rcbo s and rcd tested fine

Thank you

@50:48 Interesting that your talking about measuring short circuit currents for final circuits, I've only ever measured it at DB's and switch boards. The test form in BS7671 doesn't have a column for this info , though. Maybe the next amendment could address this, as theres not c column for r1+rn either.

just looking at this, and in OSG, table B6, 16A type B zs is 2.2, or have I cocked up.

Love these videos, very informative and the delivery is second to none. It makes understanding the calculations a lot simpler even though they could be considered relatively difficult. One small observation was the example at 57:07. Were using a 32A type C RCBO, however at 58:39 were using a current/time graph for a type B. It doesn't effect the overall outcome as it in fact makes the outcome worse. Roughly 20-21 seconds until tipping instead of the stated 17. I am wondering if you take ambient temperature readings during EIRCs and do you state the temperature on your Schedule of Test Results?

@ 41:46 How come we are permitted to have a higher Zs when the ambient temperature increases? I would have thought it was the other way round..

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11:20 damn right, this is just a myth. Every time we ring distributor they don't even know what earthing arrangement for that property is, including Ze, all they say is 'landlord should know it'. Bollocks. It's all just a myth.