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Approximately, not very much. :thumbup:

Judging from working with overhead triplex on resi services, pulling up the "normal" slack only gets me another 6" to work with.

Order a couple feet extra per pole and you'll be good.
 

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Hi,
I would add 10 ft to the length of the run.
Tri plex is cheap, impossible to stretch, and you'll need some for terminations or for the slack between wedge clamps.
The slack you see looking back towards where you came will look like alot when you're on the pole, but when you get back on the ground and walk 100 feet away, it'll look pretty tight.

Tight is not really good because of the loading spoke of above.

There ought to be a foot or more of slack in the belly of the run, not inches.
This depends on the length too.
longer run more slack..
We try to make any new runs the same as any existing runs regarding slack.
I always have to step back and look at it from a distance to get a good idea.
 

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First thing I would check is if the lighting pole is rated for the extra strain of holding the cable.
You're right,
I was also assuming wooden poles.
Aerials to light standards is something we have not done.

130 feet of # 6 Tri-plex is pretty light.
Some times you need to use you're best judgement.
The class of pole should be taken into consideration as well as the pole's condition at the base, the condition of the ground around it, spacing of the aerials.

There is alot to consider but we have to believe that the OP already thinks or knows the pole is capable.
 
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