Chassis Wiring (LENGTH)?

Discussion in 'General Electronics Chat' started by Guest3123, Jun 29, 2016.

  1. Guest3123

    Thread Starter Member

    Oct 28, 2014
    What is the length for Chassis wiring?

    AWG Chart Here

    So, according the chart, 55 Amps from 10 AWG for chassis wiring.

    What is the specifications for chassis wiring length? What is the Maximum length to be called chassis wiring?

    Quick Chart

  2. Bernard

    AAC Fanatic!

    Aug 7, 2008
    For an old tube type chassis, 8 X 12 in, a continuous length of a filament wire might be about 2 ft. Interconnected trays might run 20 ft. No precision intended.
    Guest3123 likes this.
  3. Guest3123

    Thread Starter Member

    Oct 28, 2014
    So what you said, is roughly 1 to 2 feet is the maximum length of wire for chassis wiring?

    You'd figure they'd have a rule or code for this someone on Google.

    Chassis wiring by code is 1 to 2 feet length. I'm sorry, but shouldn't this information be given when given a chart like the one I posted about the current limits on chassis and power transmission wire runs? Why do so many things require you to look up additional information..
  4. BR-549

    Distinguished Member

    Sep 22, 2013
    The chassis environment will determine chassis wiring. More than likely, we would use an insulated conductor with the proper rating.

    Current is just one of many factors with chassis wiring.

    Voltage, current, temp, air flow, proximity, movement, rodent attractiveness are some.
    Guest3123 likes this.
  5. JWHassler


    Sep 25, 2013
    The higher ampacity of chassis wiring is because the wires are not in a raceway and can run a little hotter.
    You still have to use the resistivity*length to figure voltage drop
    Guest3123 likes this.
  6. #12


    Nov 30, 2010
    No. Chassis wiring is calculated for each case. Do you want the maximum length of wire you can use from that chart, regardless of whether it's going to be in a refrigerator, a steel mill, or a military airplane? No such luck. If you want to design things, you have to understand the conditions the wire needs to survive in and actually do the work to figure out what the design needs.

    My NEC book shows wire rated from 60C to 250C for temperature. Your "Quick Chart" doesn't say anything about temperature, but I'll bet it's based on room temperature and 60C or 75C wire insulation. The chart does have ohms per length. That's a clue. How much voltage can you afford to lose in that wire of unknown length? Same answer for all wires, all loads, and all temperatures? Impossible.
    Because you haven't found the right Quick know...the one that covers every condition, every usage, and every published specification for every design that ever has been or ever will be.
    Guest3123 likes this.
  7. crutschow


    Mar 14, 2008
    Chassis wiring has no particularly length limit, it's just wire that's not run in a conduit or other tightly enclosed space.
    The maximum length is usually determined by the maximum wire voltage drop you can tolerate in the system for a given wire gauge.
    If you are looking for nice, tidy answers to all your questions, then you should look into something besides engineering. :rolleyes:
    #12 likes this.