We just tie-wrapped these wires inside of our box, making this a harness bundle of 8x wires. Sign up using Email and Password. So to be clear, you were originally assuming 8 wires all together in one bundle 4 power and 4 return?
|Date Added:||11 September 2013|
|File Size:||27.27 Mb|
|Operating Systems:||Windows NT/2000/XP/2003/2003/7/8/10 MacOS 10/X|
|Price:||Free* [*Free Regsitration Required]|
But this is all a bunch eee-nst-002 idealized math, and really, the proposal that we've come up with for now is, "well, these are all internal wire harnesses, with wire lengths less than 6-in everywhere low effective series resistanceand we have already calculated the power dissipation per wire based on measured efficiency calculated throughout the unit, so let's just propose that from this information, plus tying wires to the chassis for cooling where needed, we should be okay.
Turns out single wires all converge at a derating of 1. Much better eee-iinst-002 air cooling. Proposed these comments, plus my research, to my boss yesterday and came up with an okay proposed solution to our predicament.
But separating them even a little bit would help in the cross-conduction of heat, so that's not a bad idea That would surely be better in terms of EMI, yes? Solar Mike 1, 1 3 Imho the 25A is for a single instance of the cable in an open situation. We just tie-wrapped these wires inside of our ee-einst-002, making this a harness bundle of eee-insr-002 wires. True, and that's what a lot of these specs talk about - making sure your insulation holds up due to heating, and how really, the harness itself is best derated on a case-by-case basis based on the temperature rise of the wires and the temperature rating of the insulation.
Well, we're also looking at a lot of space constraints in this whole eee-nist-002. INST would dictate that eee-lnst-002 need 8x 12AWG wires since, according to the derating table, 12AWG wire is rated at 25A, and 4x would cover the positive bus and 4x the negative with some margin to spare. Agreed that sinking them to the chassis would help in low atmosphere situations.
Talking to my boss, however, all of these wires are internal to our box, and less than 4-in per, some even being shorter. I'll post an answer on our findings though.
At high altitudes there is no air, anyway. And more importantly, are my boss's fears that we suddenly need to double the current rating for every cable in our unit unfounded, or at least able to eee-inzt-002 allayed?
We need a power input of something like 85A 70V.
The issue that I have isn't about stranded versus solid. With a bit of research from him, we found an older MIL spec MIL-W which addresses this very issue quite well, and includes the following derating curves for bundled wires!
Does this imply that at high altitudes where there is little or no air, all wires even singles should be derated as if they were in bundles? But as soon as the cables are covered or surrounded by insulation the current capacity is reduced.
And if you split into two bundles, why wouldn't you make it one bundle of 2x ground and 2x power and another bundle of 2x ground and 2x power maybe even twisted pair? Sign up or log in Sign up using Google. Would you consider this any differently that 8 power wires all together in one bundle? Sign up using Email and Password.
MIL-W does seem to classify tinned, copper strands as one wire so long as the outer diameter of said wire is of its declared gauge. Sign up using Facebook. Home Questions Tags Users Unanswered. Bundle these wires flat against the chassis, so the wires dump their heat into the metal.