sag charts and ruling span

[scott6824]

foreman left us... just wondering if someone has a good link to some sag charts and a formula for finding ruling span... not looking for transmission lengths ... small system lengths from 150 to 300' mostly looking at 1/0 raven and 336 merlin... used to just sag till it looked tight... I looking at a more accurate way of doing things. located in Wisconsin so icing is a factor...:) thanks...

[topgroove]

http://www.spaceagecontrol.com/calccabl.htm (http://www.spaceagecontrol.com/calccabl.htm)

try this site out... the calculator is kinda handy

[Have bag will travel]

foreman left us... just wondering if someone has a good link to some sag charts and a formula for finding ruling span... not looking for transmission lengths ... small system lengths from 150 to 300' mostly looking at 1/0 raven and 336 merlin... used to just sag till it looked tight... I looking at a more accurate way of doing things. located in Wisconsin so icing is a factor...:) thanks...

To find your ruling span:

find the average of all spans say 275'

take the longest span and subtract the average span then find 2/3 of this

say longest is 350 so 350-275=75'

75'*2/3=50'

then add this number to your average span this is your ruling span

275+50=325'

Ruling span=average span + 2/3(longest span - average span)

[linemanfrog]

Just have to ask.....Where did you learn that formula? It seems that everyone has a different one they use and this one matches what I was taught. I do not know where it originated but it works well on our system.

[Edge]

Just have to ask.....Where did you learn that formula? It seems that everyone has a different one they use and this one matches what I was taught. I do not know where it originated but it works well on our system.

Linemans cablemans bible prolly...

for what it's worth...

Edge

[Trbl639]

To find your ruling span:

find the average of all spans say 275'

take the longest span and subtract the average span then find 2/3 of this

say longest is 350 so 350-275=75'

75'*2/3=50'

then add this number to your average span this is your ruling span

275+50=325'

Ruling span=average span + 2/3(longest span - average span)

That's what we used at Entergy, unless the engineers specified on the job print...due to Ice loading.........but a lot od small jobs...say 20 spans or so......then the Calibrated EyeBall was used!