Conduit Runs and Pull Boxes

That is not in the NEC. It is more a design issue.

Thanks, that would explain why I couldn't find it. I have always used a number of 200' as a rule of thumb for my installs but just wanted to find if it actually said it anywhere.

The only thing I have ever found in the NEC concerning pull boxes is the maximum turns. I also have used that 200' rule of thumb, and never had an install fail inspection for this.

ricky t; usually the lenth of your fish tape. perry

I have a 600' fish tape, not a good answer

Greetings.

I agree. That is what I was thinking as I read down the list. Usually 10 feet less than length of fish tape if possible. Fish tapes usually come in 50 ft, 100 ft, and 200 ft.

I have used a plastic baggie and a vacuum cleaner to pull a leader through very long runs of conduit,300 feet or more(usually underground).Works great.I don't recall seeing a specified maximum length, but usually put on every 100 feet for convenience sake.

Hey Guest,

I know he original post concerned the length of 3/4' conduit between pull boxes .I am from the Caribbean, we do have a local electrical code which specifies a maximum of three 90 degree bends and 120 feet of conduit between pull boxes.

But the idea of using a vacuum cleaner and a plastic bag to pull in a pull-line is a very unique idea.

For small conduit up to 1" , I normally use a very light nylon line tied to a small ball of styrotex blown by compressed air.. For large conduit up to 4" , I use a plastic pop bottle tied to the nylon line. Works great too.

Is there any other great suggestions which may benefit us all.

Just my 2 cents worth.

NEC rules trump all, but in addition to that I use a program call "Pull-Planner 2000". It is available from American Polywater. Works well. Saves sleepless nights wondering if I have gone too far with my pulls. I think it costs $99. Worth every penny.

From Sleepy,

Whatever length of pull through that you achieve; it will be dependent upon the thickness of the cable and the type of cable that you are trying to pull through. Also I have found in practice that you can obtain slippery stuff to coat the cable with and this aids the pull capability considerably.

Years ago, the ointment of choice was called Hellerman oil, we used to use this for small cables in confined spaces; I do not know whether this is available nowadays but you can purchase Ideal, Yellow 77 Wire pulling lubricant which is more appropriate for pulling cables through conduit; I have used it for many years. Made in the USA but I bought it locally here, in the Uk, at my local Electrical Wholesaler.

Good Luck

Sleepy

As a general rule we go 200 feet, the state many years ago enforced the 200 foot, today it depends on the pulling force for each type and size of wire. You can have no more than 360 degrees in a conduit run with out a box or pulling body. the program from the pulling lube companys work great.