This question is about voltage drop calculations with respect to the return/neutral cable. It is answered by SELECT (Theme – Regulations & Legislation):
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| Look at Appendix 4 of BS7671: 2008. |
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This Q & A is one of thousands posted in our Technical Expertise area, and answered a daily basis by our Voltimum Experts. Question: Everywhere, it seems that we only calculate the voltage drop on the supply live cable to ensure that it does not exceed the laid down limits.
Why is the voltage drop on the return/neutral cable ignored?
Technically, the total voltage drop at the load would be the sum of the voltage drop in the supply cable and the voltage drop in the return cable. Am I missing something?
Answer: Appendix 4 in BS7671: 2008 states that the values of voltage drop are given for a value of 1A for a metre run, and represents the results of the voltage drop in all the circuit conductors.
Please look at Appendix 4 of BS7671: 2008 for a more detailed explanation.
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