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How to Calculate Total Earth Fault Loop Impedance - Applying a Temperature Factor to R1 + R2
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- เผยแพร่เมื่อ 16 ส.ค. 2024
- 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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How to Calculate Total Earth Fault Loop Impedance Part 2 - Applying a Temperature Factor to R1 + R2
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Thank you from me too.
Clear and concise.
Having done 16th/18th/2391 but never used on a daily basis, I go rusty quickly.
I love calculations 🤗
It still fascinates me how some clever person come up with in the first place to make it easy for us. 😂
I don't, monotonous,, dreary, plodding and mind numbingly boring
Audio sounds good to me, fantastic reminder of how to do the loop impedance calculations, great video Marcus as always 👍
Thanks Sean 🦾
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
Nice funky wall paper
Yep sure is 👍🏻
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
Details are the same just a different page number 👍🏻
Thanks for watching James and commenting
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?
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
Nice video Marcus, I assume after the install is complete the Electrician can test and report against the design values?
How would you do this on a ring main?
what if i wasnt given the length?
It's Temperature
Audio is terrible
Sorry
No it's not
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.