Copper is always 16-19 milliohms per square mm of cross-section per core per metre of length. This range varies with core temperature and metal purity.
(This '16' rule of thumb is worth memorising, same as knowing that 1/16 of an inch is 1.6mm and also 16SWG steel sheet thickness (near enough for most purposes. knowing this allows you to stride about the place and look up at mystery wiring and suck your teeth and say ' the volt drop on that run may be worth checking' while less experienced colleagues have run to back to the van for the book of tables or are waiting for the right app to boot up on the latest fondle slab...)
So a 1m length of 1mm2 is say 16miilliohms and so 16mm2 is about 1 milliohm per metre, 160mm2 is then 0.1milliohms per metre, and 300mm2 will be a touch over 0.05milliohms per metre as 300 is not quite twice 160, so we do not quite halve the resistance.
If you have the internet and want a closer answer, then typical makers data suggests 'less than 0.06 ohms per km' on page 4 of 6.
not sure how you expect to measure that with any precision unless you have a very long length or a very high test current.
Copper is always 16-19 milliohms per square mm of cross-section per core per metre of length. This range varies with core temperature and metal purity.
(This '16' rule of thumb is worth memorising, same as knowing that 1/16 of an inch is 1.6mm and also 16SWG steel sheet thickness (near enough for most purposes. knowing this allows you to stride about the place and look up at mystery wiring and suck your teeth and say ' the volt drop on that run may be worth checking' while less experienced colleagues have run to back to the van for the book of tables or are waiting for the right app to boot up on the latest fondle slab...)
So a 1m length of 1mm2 is say 16miilliohms and so 16mm2 is about 1 milliohm per metre, 160mm2 is then 0.1milliohms per metre, and 300mm2 will be a touch over 0.05milliohms per metre as 300 is not quite twice 160, so we do not quite halve the resistance.
If you have the internet and want a closer answer, then typical makers data suggests 'less than 0.06 ohms per km' on page 4 of 6.
not sure how you expect to measure that with any precision unless you have a very long length or a very high test current.
