Question on voltage drop and cable size, if your cable run exceeds the allowed length you would use a larger size cable is this correct ,for example on a lighting circuit using a 6 amp fuse or mcb what is the max size cable you could use using the same 6 amp fuse or mcb to overcome the volt drop problem.On a radial circuit using a 15 amp or 20 amp fuse or mcb what max size cable could you use to over come the voltage dropusing the same fuses or mcb 15 amp or 20 amp.On a ring circuit using a 32 amp fuse or mcb what would the max size cable you could use still using the 32 amp fuse or mcb to overcome voltage drop thanks.
Voltage drop cable size question
- Thread starter cardiy
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Volt drop is calculated by design current, not by the overcurrent protective device. To overcome volt drop you may increase cable size.
You probably wont have all the load at the remote end of the circuit so all the volt drop wont be across all the circuit, for example in a lighting circuit the highest load will be on the first leg, then current will reduce a bit, then along the next leg to the next light, then the current will drop a tad more and so on to the last light.
Similar with socket circuits, the points of utilisation are spread around the circuit hence currents will be different in different parts of the circuit.
You probably wont have all the load at the remote end of the circuit so all the volt drop wont be across all the circuit, for example in a lighting circuit the highest load will be on the first leg, then current will reduce a bit, then along the next leg to the next light, then the current will drop a tad more and so on to the last light.
Similar with socket circuits, the points of utilisation are spread around the circuit hence currents will be different in different parts of the circuit.
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thanks bas and spark 123
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