ChatterBank1 min ago
Increasing Size Of Cable Conductor
6 Answers
Hi,
We want to install a door intercom. it says the conductor size of the cable should be 0.75, it works on 12v DC and consumes 1000ma. I have some telephone cable for oudoor use, but its 0.5 conductor. the telephone system is 50vdc. so, if we joint two wires together to make one conductor, and another pair to make the second conductor, have we now got a 1.0 cable conductor? Will this work?
thanks,
Annie.
We want to install a door intercom. it says the conductor size of the cable should be 0.75, it works on 12v DC and consumes 1000ma. I have some telephone cable for oudoor use, but its 0.5 conductor. the telephone system is 50vdc. so, if we joint two wires together to make one conductor, and another pair to make the second conductor, have we now got a 1.0 cable conductor? Will this work?
thanks,
Annie.
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the 0.5 cable has a resistance of 13 ohms per mtr, so if the cable run is max 30 mtrs, total resistance is 390 ohms. therefore......... buggered if i remember the rest. ohms law was not my favourite subject. I only remembered the ohms to mtrs because it was a slogan almost, used by us GPO girls to measure faults,
" resistance, in ohms, is inversely proportionate to length in mtrs."
what a lovely phrase.
annie
the 0.5 cable has a resistance of 13 ohms per mtr, so if the cable run is max 30 mtrs, total resistance is 390 ohms. therefore......... buggered if i remember the rest. ohms law was not my favourite subject. I only remembered the ohms to mtrs because it was a slogan almost, used by us GPO girls to measure faults,
" resistance, in ohms, is inversely proportionate to length in mtrs."
what a lovely phrase.
annie
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