duke3k
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« on: July 27, 2010, 10:24:20 AM » |
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Seeking advice/ opinion
So I'm going to need to be running two wiring runs from the top of my ECS struts thru the firewall to my controller inside the car....
I'm thinking of two runs of Cat6 (8 conductor ) cable. Most of these cables are rated to 50 to 75 degrees C. Do you think I need to go with a better grade of high temp cable???
Duke.
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Mitsubishi GTO
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« Reply #1 on: July 27, 2010, 12:32:11 PM » |
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I'm pretty sure as long as you stay away from your turbo heat shield you should be okay with that... Like if you run it by the brake master and the washer pump.... I'm not sure of underhood temp tho. Idk just my thought on it :B
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Syndacate Saint
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« Reply #2 on: July 27, 2010, 12:38:42 PM » |
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That is a hard question if its 102 degrees outside and youve been driving for an hour, I know that everything in the engine bay gets pretty hot. But you said c = 112 - 158 degrees Fahrenheit, so i think you will be good!!
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J. Fast
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« Reply #3 on: July 27, 2010, 09:01:34 PM » |
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I think you should be okay, Marcus. I have some Avaya Gigaspeed Systemax with an insulator seperator and a secondary grounded heat shield. It's for high temp applications.  |
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J. Fast
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« Reply #4 on: July 28, 2010, 06:58:10 AM » |
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Here's some spare stuff I have in the garage...    The one I'd recc is the last one as it has a plenum exterior shield and a secondary steel foil heat shield. It also has an additional ground with a core separator for signal isolation on pairs. Lemme know which one to bring you. Jeremy Jeremy |
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duke3k
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« Reply #5 on: July 28, 2010, 09:38:34 AM » |
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Fuckin A - J. What the hell are you - "J's House of Industrial Wire"....  ... I will definitely take you up on some of the "Red Stuff".... sounds perfect... Duke |
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J. Fast
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« Reply #6 on: July 28, 2010, 12:19:49 PM » |
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LOLO! You have no idea. You should see some of the cool techie tools I have too  ! |
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98slept
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« Reply #7 on: July 28, 2010, 12:53:41 PM » |
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OMG. you serious when it comes to wiring. lol....omg...
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duke3k
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« Reply #8 on: July 29, 2010, 06:22:25 AM » |
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J-
Couple questions on the "Red Stuff" -now that i look at the pics closer it looks like its only has 6 conductors which means its not CAT5/6. I only need 4 per strut so thats fine- but do you know what the resistance is of the wire per 100 ft? From the pic it looks like its 24gauge.
The micro-controller can only supply 40ma of current to the +5v logic I/O pins and I need to make sure i dont get too much voltage drop over say a 20' run.
and is it solid core or stranded?
duke
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« Last Edit: July 29, 2010, 06:25:17 AM by duke3k »
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J. Fast
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« Reply #9 on: July 29, 2010, 07:22:50 AM » |
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It's 8 strand with dedicated ground, so 9 wires. You can also auxillary ground with the shield... I've had to do that with a few VIOP and layer 3 backbone switches and Definity systems. (ground to frame, ground to unit) I have it in stranded and in solid. Temp range is to 500F |
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J. Fast
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I don't think you'll have any problems with attenuation or signal drop as I can certify the connection for 2gig with less than 2% at nearly 300ft. We can fluke it and then check the singal traffic on another one of my Toys, a Fluke Optiview... $10,000 toy |
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duke3k
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ok show-off.. my application isn't going to be sending any kind of AC or modulated signal down the line it's a simple TTL logic level signal I need send /read i.e. either +5v or 0v depending on what the strut switches are doing. So since it is 8 conductor cable - I'll assume Cat5e which has a nominal resistance of 0.188 ohms / meter for 24g wire. Lets say a 7meter run of cable from the back of the car to front. Using good 'ol E=I*R that means we get : E (voltage drop) = 50ma * (0.188*7) = 65.8 millivolt drop or= 0.07 Volt drop So measured Voltage back at the MicroController should be more than close enough to 5v for it to correctly read the logic state. - i.e it will be (5v-.07) . For TTL logic the minimum voltage level for a valid logic 1 is 2.7 volts to 5 volts. Life is good... P.S. I still want to see your bazillion dollar fluke.... I'll try not to drool over it to much.... |
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« Last Edit: July 29, 2010, 10:06:43 AM by duke3k »
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J. Fast
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So since it is 8 conductor cable - I'll assume Cat5e which has a nominal resistance of 0.188 ohms / meter for 24g wire. Lets say a 7meter run of cable from the back of the car to front.
Using good 'ol E=I*R that means we get :
E (voltage drop) = 50ma * (0.188*7)
= 65.8 millivolt drop
or= 0.07 Volt drop
So measured Voltage back at the MicroController should be more than close enough to 5v for it to correctly read the logic state. - i.e it will be (5v-.07) . For TTL logic the minimum voltage level for a valid logic 1 is 2.7 volts to 5 volts.
 It's cat 6e, Marcus. |
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Colorado3S
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