Roping in CT Service

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Yep - just used a scale ruler - And Al could just about stand inside that disco...

Some of the conductors look a little short in the CT cab (Phase A)

Anyway there is one post that had a pic with "ROPED" ct cab somewhere.... I remebmber it only because I have not roped one in some time now - Most have racks for ties now - like the one shown here.
 
brian john said:
In a CT cabinet I would thing adequately bundling the conductors would be difficult due the size of the can and mandatory separation caused by the CT's>

I have never felt cable ties served this purpose as ALL cable ties dry rot over time. No matter what the package says.
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But by the time they "rot" out, the cables are pretty much petrified into their position.
 
chris kennedy said:
Another 3/0 goes to two 10' by 5/8ths copper rods. Thats the 2 round green hand holes.
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Why did you run 3/0 to a ground rod? Job spec? I want to scream when I see specs like that. :roll:
 
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Yep - BryanMD that was it.... (sort of slipped when looking at your post before)
 
mdshunk said:
I wonder what the dielectric strength of rope is when it draws damp from the night air?
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Maybe the same as it is dry???? Whats the dielectric strength of the conductor insulation it is on? Whould you be thinking the same if it were a wooden or plastic kleat?
 
e57 said:
Whould you be thinking the same if it were a wooden or plastic kleat?
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Wood, yes. I'm sure the dielectric properties of saturated rope or saturated wood are modified, but maybe not enough to make a difference. In practice, you're only going to see this up to 480 volts. Nobody's roping in 13.2, for instance.

I'm trying to remember the particular utility's "meter book" that I saw one time that had a detail of a roped in service, calling out rope type, diameter, and number of wraps in a certain manner. It was from a Pacific Northwest state, if that rings a bell for anyone.
 
iwire said:
Marc,

Why would we care? :-?

Do we ask what the dielectric strength of a metal raceway is?

I suspect it is kind of low. :wink:
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I'm not sure who 'we' is, but I like to puzzle on such things.

I think it might be something worth thinking about, at least, since the rope is so close to the terminations and could potentially be the path of a phase to phase fault.
 
mdshunk said:
I'm not sure who 'we' is, but I like to puzzle on such things.
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OK the 'we' is you. :grin:

I think it might be something worth thinking about,
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That of course is up to you, but you posted it for all of us so I get to respond. :smile:

Considering the small distances required by 312.11(A)(3) IMO the rope is of little concern unless it is in contact with live parts.
 
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