Chassis wiring is small lengths between components, probably with a resistance of milliohms. Power transmission is between equipment or connecting your equipment to the mains supply.
It also covers wiring between power sockets. Should you find yourself in a chronically leaking boat, energy devoted to changing vessels is likely to be more productive than energy devoted to patching leaks.
Warren Buffett. Monkeh Super Contributor Posts: Country:. Their 'power transmission' numbers are hilariously low, and their chassis wiring figures are high. Ignore those people entirely. Make sure you stay well below that table's "Chassis Wiring" numbers as well to make sure you don't burn up the wire. If the calculated wire size is too big for what you want to do can't fit in conduit, etc. Online Calculator. Quote from: Monkeh on April 17, , pm. Quote from: JoeN on April 17, , pm.
Quote from: Simon on April 18, , am. Quote from: Monkeh on April 18, , pm. Quote from: Simon on April 18, , pm. And the last time I checked I was more concerned about voltage drop than so called ampacity. Realistically you can't specify the amp rate of a cable unless you know the insulation spec and you know what you want. Last time i speced some 20AWG it was based on the known cable run length and the voltage drop I was willing to have, I also totally disregarded the 20A rating of 16AWG because I needed less voltage drop and went with 10A per 16AWG core much to the surprise of the loom subcontractor but based on real tests I carried out.
During my younger years when my electronics expertise was in its infancy, I once made the horrible mistake of wiring a 12V DC switch incorrectly on a project box. The switch connected a 12V lawn mower battery to a radio transmitter. Upon engaging the mis-wired switch, the connection created a short circuit between the negative and positive terminals of the battery — effectively dumping up to Amps of current down some 18 AWG wire.
I watched in horror as the wire literally melted from the inside out, causing a flash-fire with the PVC wire insulation melting away like candle wax! The melted wire dripped onto the carpet and nearly started a house fire.
Example: Electric Blanket Fire. Fortunately, I was able to disengage the switch quickly before things got even worse, but literally in a matter of seconds, significant damage was done. I learned a hard lesson that day about just how important current-handling capacity can be when it comes to cables. What would happen if a whole bundle of wires ignited and went unnoticed? Besides the fire risk, the burning PVC insulation contains toxic fumes that can prove deadly in their own right.
To prevent disaster, you should always select a cable based on the most conservative of safety ratings in mind. The extra margin of error can be a life-saver. This is why maximum current for chassis wiring will be more compared to an equivalent power transmission. Skip to content power wiring I am putting together a test system that'll be carrying over 50Amps. Best Answer. Related Question.
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