Yes, because it's a simplistic calculator and does not try to calculate operating temperature, so it will use the published maximum VD figures, which are of course higher for a cable at 90° than one at 70°.
Wiring between outbuildings - SWA needed if run in ducts?
- Thread starter aesmith
- Start date
Thanks. I'll check with proper tables once I think I'm finalised, those online things are convenient to get a rough idea.
You obviously can do that to reassure yourself but, for single-phase calculators, if you tell it 2-core and PVC (regardless of how many cores you have and what type of insulation you have), the TLC calculator will give you the correct VD figure.
Kind Regards, John
It will err on the side of caution, and use the impedance of the cable at its maximum operating temperature.
Indeed. In practice, I suppose that might be a significant 'err'. AFAICS, VD is usually the limiting factor, so a cable adequate for the required VD at design current will usually be working well under its maximum CCC, hence presumably appreciably below its maximum operating temp. Mind you, I think we're probably usually only talking of pretty small 'errs'.
Kind Regards, John
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