In part 2 Marcus looks once again 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-Ste 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 Pt2
00:38 - Calculation parameters
01:20 - Use the latest On-Site Guide
01:31 - Size the conductors
01:58 - Temperature factors
02:37 - R1 + R2 allowing for a temperature factor of 1.2
03:42 - Total earth fault loop impedance
04:43 - 6 amp type C BSEN60898 MCB
04:53 - Maximum Zs values in BS7671
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