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Old 02-14-2019, 11:25 PM   #15
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Originally Posted by Jekerrville View Post
How do any of us leave the house for fear we will exceed a specification of some sort??

I am looking at a PoE (power over Ethernet) power injector for powering a 2 amp 600 miliwatt broad band bridge that is 100 feet up on a tower using Catagory 5 cable.

The the injector is rated at 2.8 amps and is certified in the US and Canada for critical communications.

And we are sweating a USB charger circuit spec. at 2.4 amps in-rush current to charge a cell phone or tablet?

Remember that is 2 pair of a 4 pair twisted pair shielded fire rated cable.

Good grief, 100% worst case engineering is one thing bug just trying to reuse a cable to charge a cell phone is a bit paranoid.

Murphy Laws is quietly laughing.

Safe travels (With 5 lb fire extinguishers by you bed)

Murphy and I kinda have a thing and spend way too much time hanging out together. But I think in this case, you're saying "go for it".

And the fire extingisher is in the entry well. Not at arms length, but only 6 ft. away.

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Old 02-15-2019, 07:49 AM   #16
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rowiebowie,
Amen!
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Old 02-15-2019, 08:30 AM   #17
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Originally Posted by Jekerrville View Post
How do any of us leave the house for fear we will exceed a specification of some sort?? Good grief, 100% worst case engineering is one thing bug just trying to reuse a cable to charge a cell phone is a bit paranoid. Murphy Laws is quietly laughing.
Fear of doing what Airstream certifies they meet as the MINIMUM required when they deliver a trailer or Class B to you? Yes, I would have some concern if I found that Airstream delivered my trailer without meeting the specifications they claim.

I have no idea where you got the idea that ANSI LV 2018 is 100% worse case engineering. That is factually incorrect.

Recommending that everyone follow accepted minimum safety practice is always a good idea.

73/gus
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Old 02-20-2019, 10:37 AM   #18
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Check out the power over Ethernet (cat5) specs:
https://en.m.wikipedia.org/wiki/Powe...ds_development
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Old 02-20-2019, 11:47 AM   #19
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I'd use it with a 1A fuse without a single worry

Usb 5v 2.1 amp isn't the same current you'll see at the 12V feed, a cheap 70% efficiency converter would pull .76A , so stick a 1A fuse on the cat5 cable and move on


I happen to have NASA EEE-INST-002 on my desk, table 4A, 26gauge wire, bundled, in a vacuum (no cooling), 1.4 amps.
That's for 200C Teflon insulated, cat 5 is 60C pvc, so cut it by 75% is .35A, times 4 pairs is back to 1.4 A, which is 50% more than you need

Like I said, stick a 1A fuse on it and sleep worry free.
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Old 02-20-2019, 02:18 PM   #20
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I see no problem. In fact you could run only +12 thru the cable and tie ground to the chassis. I would get a 12 to 5 volt converter (ebay about $5) and drop the voltage at the end.
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Old 02-20-2019, 03:16 PM   #21
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Originally Posted by cedonly View Post
Check out the power over Ethernet (cat5) specs:
https://en.m.wikipedia.org/wiki/Powe...ds_development
Thanks.

Quote:
Originally Posted by Magnet18 View Post
I'd use it with a 1A fuse without a single worry

Usb 5v 2.1 amp isn't the same current you'll see at the 12V feed, a cheap 70% efficiency converter would pull .76A , so stick a 1A fuse on the cat5 cable and move on
I discovered the wire is actually 24ga. I will try a 1A fuse and maybe go to a 2A tops.

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I see no problem. In fact you could run only +12 thru the cable and tie ground to the chassis.
I thought about that too. My usb outlet comes in tomorrow from Amazon.
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Old 02-21-2019, 10:28 AM   #22
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I used the old cat 5 wires for the sun explorer to power the Victron BMV.
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Old 02-21-2019, 12:20 PM   #23
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I used the old cat 5 wires for the sun explorer to power the Victron BMV.

That's one thing I wanted to do. But their monitors are pricey and with bluetooth built into the Victron controllers now, I decided to re-purpose the wire for a an additional USB since in '2012 Airstream did not install them in their Avenue class "b's".
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Old 02-21-2019, 12:56 PM   #24
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I suppose by now the decision has already been made to do it or not do it. We called this stuff "JK" or "Jake" which stood for "Jacketed wire" plus 4 conductor or 2 pair depending on what the color coding and if it was twisted or not... red-green-yellow-black or white and blue pairs. Most of what we used was 24 gauge. What its doing or used for determines the RJ designation. 2 pair could be CAT3... 4 conductor isn't CAT anything. Bottom line, doubling up conductors so you can have 2 conductors + and then 2 (-) would result in about a 4% voltage drop for 12vdc at 1 amp with a single run of 12 feet. You could cut that VD to 2% if you could find a ground near the "plug" and use all 4 conductors for +. I would fuse it for 2 amps and go for it.

Clint
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Old 03-13-2019, 09:44 PM   #25
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Followup on my original post:

It turned out the CAT5 was 24ga and not 26ga as I originally thought. Therefore, I proceeded with using 4 wires for the positive and 4 for the negative with a 1A in-line fuse from the Victron Solar Controller "Load".

I love the Victron for program-ability and monitoring.

It turns out the USB outlet from Amazon is a 2.1A not a 1A. I was worried it might stress the wiring, but as someone pointed out, at 5 volts, the amps would not be that much and they were right. I just plugged in my phone and the Victron shows only a .4A load. I'm happy with result.

Thanks to all who took the time to offer advice. That's why I love this forum.
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