Am 06.11.2015 um 22:11 schrieb Peter Hollenbeck:
> Ocean temperature at depth of about 5 feet.
>
In that case your concerns should be:
* No flame retardants in the cable sheath. Because these are hygroscopic
so seawater will make the sheath crumble.
* UV resistance. Ground cable obviously has zero UV resistance. It's
built to resist pressure from gravel, ground movements and mice.
* No air inside the cable. Because if you have air inside the cable,
there's room for water in it, too, which makes your whole cable foul
away if you have a single spot which is not water-tight.
I'm concerned how many people think Cat5e is the most suitable cable for
onewire. It isn't. Onewire will work with any cable, the limitation is
cable capacitance, which is especially bad with twisted-pair, as Cat5e
offers. You gain no benefit from TP because onewire has asymetric drive.
Plus, the shield is ineffective when not properly *earthed* (not
grounded!), as it seldom is. In that case, the shield acts as an antenna
which picks up additional noise.
For onewire, unshielded telephone wire on a pole is better than Cat5e.
My suggestion is to use a 3x1.5mm² silicone cable intended for mains
voltage, as silicone doesn't need flame retardants, it is UV resistant
and hasn't got air inside the cable, as Cat5e has. If you need more
mechanical stability, try black PE sheated cable but take care for the
flame retardants and air.
Kind regards
Jan
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