Basic Wire AWG Theory and Current Rating

[FlightSim]

Hi, I'm looking at supplying 4.3A through a 19way connector, each crimp can accept max wire size of 22 AWG. I was looking at an AWG able to check the current ratings, for 22 AWG: in air 7A and in jacket 0.92A, so does that mean to get the 4.3A its 4.3/0.92 = 4.67, therefore I need 5 22 AWG wires to acceptably achieve the desired current. So with the ground or return I need a tool of 10 22 AWG wires to my connector to provide the 4.3A. Is there a table similar to translat the wire size into track dimesnions for a PCB for current ratings. Thanks Paul

 

[MacGyverS2000]

Using so many small wires for power is generally a bad idea... switch to a smaller connector with bigger (and fewer) wires.

Dan - Owner

http://www.Hi-TecDesigns.com

 

[itsmoked]

Yes, because there is no guarantee that wires won't break eventually leaving you short, hotter, and not knowing it.

Keith Cress
kcress -

http://www.flaminsystems.com

 

[mcgyvr]

and there are tons of trace width calculators for PCB's..
like this

http://circuitcalculator.com/wordpress/2006/01/31/pcb-trace-width-calculator/

 

[hacksaw]

Chassis wiring has a less conservative rating, typically for 22 AWG continuous duty DC: 7 Amperes open wiring, 5 Amperes confined. Don't forget that 22 AWG runs 22 Ohms/100ft, so there is a bit more to consider than "current rating" as suggested in the previous postings.

The usual weak link is the contack resistance in the connectors, but you also have to consider the number of mating cycles expected.

 

[zappedagain]

At what voltage? For 250 VAC you'll need 18 AWG minimum to keep the safety folks happy.

Z

 

[racookpe1978]

Vibration? Shock?

Five year olds handling it? Or "adults" ?