How to Calculate Total Earth Fault Loop Impedance - Applying a Temperature Factor to R1 + R2

In this video Marcus looks at calculating the total earth fault loop impedance of a circuit and explains the elements of the formula Zs = Ze + (R1 + R2). The video looks at how we can add a temperature factor to the calculated values of R1 + R2 which is the the resistance of the line conductor added to the resistance of the CPC. By using the temperature factors found in the On-Site Guide this means the designer of the circuit can use the 100% values of the maximum earth fault loop impedance found in BS7671 and not the rule of thumb 80% of this value.
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== 🕐 Time Stamps - Cut to the action 🕕 ==
00:00 - Calculating total earth fault loop impedance
00:54 - Applying temperature factors
01:30 - The calculation
02:11 - Zs = Ze + (R1 + R2)
03:36 - R1 + R2 and temperature factors
04:19 - Use the latest On-Site Guide
04:57 - Size the line and CPC conductors
05:48 - Temperature factors in the On-Site Guide
06:54 - Table I3
07:32 - R1 + R2 calculation including the temperature factor
08:59 - TN-S Ze of 0.76 ohms
09:24 - Total earth fault loop impedance (Zs)
09:59 - Maximum Zs values in BS7671
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[@GSHElectrical]

How to Calculate Total Earth Fault Loop Impedance Part 2 - Applying a Temperature Factor to R1 + R2
ruclips.net/video/kgZvjl4A1sE/видео.html

[@gabrielhomeku185]

I love calculations 🤗

[@callumsimpson7483]

It still fascinates me how some clever person come up with in the first place to make it easy for us. 😂

[@raymurphy9749]

I don't, monotonous,, dreary, plodding and mind numbingly boring

[@Dog-whisperer7494]

Audio sounds good to me, fantastic reminder of how to do the loop impedance calculations, great video Marcus as always 👍

[@GSHElectrical]

Thanks Sean 🦾

[@jimmjl]

Thank you from me too.
Clear and concise.
Having done 16th/18th/2391 but never used on a daily basis, I go rusty quickly.

[@tomclay3153]

This is fantastic guidance for the smaller on-site guide. But I have my 18 edition coming up and I. 'm struggling to find the pages within the 18 edition for these caculations

[@Mike_5]

Nice funky wall paper

[@GSHElectrical]

Yep sure is 👍🏻

[@sergiofernandez3725]

Nice video Marcus, I assume after the install is complete the Electrician can test and report against the design values?

[@tomclay3153]

I'm struggling to find these tables in the eighteen edition book. This is handy for the on-site guide. But my exam for the 18 tradition requires me to know where this is in the big book. Can anybody help here?

[@candoelectrics]

Not sure when this video was made, I know the data is the same, but surely you should be showing the latest O.S.G (BS 7671:2018+A2:2022) Brown one... Page 218

[@GSHElectrical]

Details are the same just a different page number 👍🏻

[@GSHElectrical]

Thanks for watching James and commenting

[@omaximal1092]

Top explanation but you got my lost in jupiter when u got the "random" (Ze) could you please explain how u got that value for those who might struggle to get it. Thank you, this video has been a great example for my project. Just the Ze thing got me lost. I did watch the video backwards and forwards. Just Ze 🤯 thank you

[@slsway1122]

How would you do this on a ring main?

[@mobolajiosula8092]

what if i wasnt given the length?

[@AndrewCook7]

It's Temperature

[@BULLEAD]

Audio is terrible

[@GSHElectrical]

Sorry

[@KallusGarnet]

No it's not

[@KendalMike]

The audio for me was inconsistent. Some parts were clear but other parts not. I assume a radio mic was being used. It seemed like there was some sort of signal problem or bad connection. I had to switch on subtitles because it was difficult to pick up some of the numbers being said. Keep up the good work guys.