Our Voltimum Experts answer your questions on a daily basis in our Technical Expertise area. This one, concerning floodlights for a football pitch, is answered by SELECT:
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| How do I calculate the volt drop? |
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Question: I have been asked to submit a quote to install floodlights on a football pitch. The designer has specified 12No 2kW sports floodlights. I need to calculate the load and volt drop to determine the cable size. How, therefore, do I calculate the volt drop on such 2kW two-phase sports lighting?
Answer: Firstly, you have not given enough information, such as cable lengths etc.
However, you must calculate the total load and determine the current to be carried. Refer to BS 7671: 2008 Appendix 4 for further details.
Check the volts drop from tables, then check that the volts drop does not exceed this value.
Note the equation: Vd = mV x Ib x length divided by 1000
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