RE: Cat5 pairs, RS232 and power

["Paul Gale" <groups@xxxxxxx>]

Thanks Ian,

I seem to remember that Cat5e is rated at over 1A - but the voltage drop
involved means doubling up would be important.

Paul.



> -----Original Message-----
> From: ian.bird@xxxxxxx
> [mailto:ian.bird@xxxxxxx]
> Sent: 27 November 2003 13:42
> To: ukha_d@xxxxxxx
> Subject: Re: [ukha_d] Cat5 pairs, RS232 and power
>
> Pass on the best way to wire but I think I remember a while back Keith
> worked out that a single pair of Cat5 wires carrying both +ve and -ve
> would carry up to about 250 - 300ma safely. I remember this as my
water
> valves draw 230ma so I could get 7 of them on one cat5 cable as long
as
> they were only on one at a time. Best check the maths rather than rely
on
> my sketchy memory though. If you are using two pairs then no problems.
> Don't forget distance has a bearing on the current calculation.
>
> I _think_ because the power is DC the winding sequence on the pairs
may be
> irrelevant but I could also be completely wrong ;-))
>
> Ian
>
>
>
>
>
>
>
>
> "Paul Gale" <groups@xxxxxxx>
> 27/11/2003 13:02
> Please respond to ukha_d
>
>
>         To:     <ukha_d@xxxxxxx>
>         cc:
>         Subject:        [ukha_d] Cat5 pairs, RS232 and power
>
>
> Going to run an RS232 signal and 12V at 400mA through a single piece
of
> Cat5e.
>
> To take advantage of the twisted nature of Cat5, should I be running
Tx/Rx
> on one pair or Tx/Gnd and Rx/Gnd on two pairs with the third pair
carrying
> +12V/Gnd?
>
> What's best?
>
> Paul.
>
>
>
>
>
>
>
> [Non-text portions of this message have been removed]
>
>
>
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