rjquillin
Joined: 13 May 2007
Posts: 123
Location: KSEE
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 Posted: Tue Jan 27, 2009 7:07 pm Post subject: Joining many wires to one - rocker switch lights to dimm |
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At 18:12 1/27/2009, you wrote:
| Quote: | Looking at your mini-bus creation using d-sub, can you give me an idea how
many amps can I put thru those d-sub pins ( I guess is a better question is
what are each of the pins rated for)??...obviously, I looking at using18-22
awg wire..probably no higher than 5 amps, but maybe as high as 7.5 amps if
possible.
thanks
Henry |
Not Bob here, but perhaps I can add some info.
The size 20 contacts in standard density connectors are generally rated from 6 to 7.5 A per contact. However total "connector" currents are, or can be, much less. The full contact rating is obtained with a single contact with AWG-18 wire. Awg-24 derated to 71% and AWG-28 derates to 48%. Then you should derate the connector for total current load. For 100% loading, the 18 wire is derated to 30%, and 24 and 28 to 20% and 15% respectively. So that 6A contact could quickly become a 1A contact. This info from an AMPLIMITE HD-20 PCB mounted connector. The document # is 108-40025 and can be found on the Tyco website.
If you are not dealing with much current, it's not much of a worry, but if a connector is loaded with a bunch of power lines, things carry much less that you may at first expect. Also, if you're going into the FL's, altitude derating may be another concern. Chapter 11 of 43.13 has some info for that.
Ron Q. [quote][b]
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