Can this wire handle the potential load

[Steve Tomlinson]

I'm feeding 28 VDC through a MS28936 130A Fuse then through a AS22759/43 4 AWG wire (200 DGC rating). The recommended maximum fuse is 70A per an FAA Advisory Circular, although the maximum 'free air' rating for the wire is about 265A.

MS28936 says that 250% of the rated current can pass for up to 5 minutes before it opens; 300% for up to 8 seconds.

I am trying to justify the 130A fuse because that is the maximum actual load. My question is - is the wire good considereing the characteristics of the fuse?

I saw the I^2*T numbers for the 75 DGC wire on your site but couldn't find the same for the 200 dgc wire we are using. If it exists I'm wondering if it would be generic enough to apply to the AS22759/43 wire.

Any direction would be appreciated.

 

[petersonra]

rating of wires for inclusion into equipment is a lot different than the NEC ratings.

I have actually done some work for the aerospace industry where fans were installed to blow cooling air over the wires to keep them from melting.

 

[Buck Parrish]

We would need more info. on the motor (s)