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Joined: Nov 2005
Posts: 828
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Joined: Nov 2005
Posts: 828 |
Hi all,
We have a customer that will be doing a lot of excavating in an area where their existing in-house CATV service runs. So, we need to temporarily re-route overhead.
The temporary span will cross a private street - however the contractor wants the wire high enough so that a dump truck with raised bed can pass below. He has specified 30' high. On one end we have a three-story apartment building - plenty high. On the other end we have a twelve-foot fairly sturdy lamp post which is owned by the customer.
Our initial thought is to strap a 30' piece of 1.5" IMC to the post with one guy wire that runs directly opposite of our drop cable direction. The actual overhead cable will be RG6 drop - so no more than 50 lbs total weight. But add ice and wind...
One other option is to make a 30' high tripod out of IMC. Unfortunately, crossing the road elsewhere would require that we re-work the entire existing underground distribution...
Comments?
Thanks!
Mike
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Joined: May 2002
Posts: 17,739 Likes: 25
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Joined: May 2002
Posts: 17,739 Likes: 25 |
Don't know what size dump truck he has, but 30 feet? Requirement on urban street crossing is 18 feet at it's lowest point. I think I'd have him raise his box and take a measurement, I'd be surprised if it's much more that 12 to 15 feet. What is your span length? I'd be a bit leery about attaching to a customers lamp post, no matter how sturdy I thought it was. Surely you can find a pole to borrow for something like this.
Retired phone dude
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Joined: Nov 2005
Posts: 828
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Joined: Nov 2005
Posts: 828 |
Spoke with another customer who is a quarry operation - they say 25' for a truck in mid-dump to clear. Span is only 65 feet long. The service will be in place for 30 days or so. Customer wants this to be as unobtrusive as possible - but we can't attach to an existing house nor to a tree (which would be marginal anyway)...
Mike
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Joined: Jun 2007
Posts: 83
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Joined: Jun 2007
Posts: 83 |
I second Bill's idea for a pole for safety reasons. If a dump truck were to catch that cable, I'd think it would snap it off (30' of pipe makes for some nice leverage) and then you would have a 30' pipe falling to the ground and hitting anyone in the way. Same goes for the tower, would probably pull over before the cable snapped. If this wasn't a construction area I'd say go for the tower.
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