Is there any book or site where I can read more up on this?It depends on how long is the extention cable.
If the 10 Amps extention is 20 times longer, then value could be acceptable; If the two extention cables have the same lenght then the 10 Amps one must be checked because resistance is too high.
Check for loose screws ; oxidated or burned temination.
If you don't find the reason for such a high resistence than discard the extention because could be dangerous.
I think the OP is meaning to check the resistance of each conductor, not polarity, since AC power presents an alternating polarity between phase to phase and phase to neutral.hi all,
I know how to check the polarity of a single phase extension cable. I have never checked the polarity of a three phase extension cable.
This is not accurate . In 3 phase wye systems it may or may not carry a neutral, that is you will get phase voltage --line to neutral and line voltage --line to line . line voltage is 1.732 * phase voltage.AC has not a polarity actually. Maybe you mean to distinguish between the live and the neutral wires. In a three phase system you have only three phases (live wires) and not neutral.
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