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Spacing between conduits, etc... #83504
02/04/03 12:35 AM
02/04/03 12:35 AM
Joe Tedesco  Offline OP
Joined: Oct 2000
Posts: 2,749
Boston, Massachusetts USA
With this rule in mind:

310.15 (2) Adjustment Factors.

(b) More Than One Conduit, Tube, or Raceway

Spacing between conduits, tubing, or raceways shall be maintained.

How do you determine the proper spacing?

When laying out the conduit, or tubing entries into a gutter, or trough what's the easiest and best way to make sure the holes are spaced apart properly to allow locknuts and or bonding bushings to be used?

Joe Tedesco, NEC Consultant
2017 / 2014 NEC & Related Books and Study Guides
Re: Spacing between conduits, etc... #83505
02/04/03 05:13 AM
02/04/03 05:13 AM
iwire  Offline
Joined: Jan 2003
Posts: 4,391
North Attleboro, MA USA
If I am pressed for space I simply use the biggest component (pressure connector, hub or bonding bushing.) and lay them out right where they are going and push them around till it looks good.

You end up with 3/4" to 1" between pipes, unless using hubs, this close together supports get tough.

Straps are out, Minnis are tough and strut clips must go in before pipe, no room to twist clips.

Am I violating 310.15 (2)?

Bob Badger
Construction & Maintenance Electrician
Re: Spacing between conduits, etc... #83506
02/04/03 12:42 PM
02/04/03 12:42 PM
Elzappr  Offline
Joined: Dec 2001
Posts: 270
Ditto for me,iwire.
I try to space the conduits for whatever is required for inserting the straps after the fact.
What is the purpose for the code reference, Joe? Was that rule made so that things would be neat and tidy, and assure that conduits are actually SPACED for proper ventilation? Or was it done in order to make sure that all conduit entries are facing boxes perpendicularly? How is this rule enforced in practice? Do you see inspectors reserving it for obvious screwed-up cases? Or do you find that inspectors call it every time they see un-even racks? I certainly haven't run into ANY inspectors mentioning it in any re-model or retro-fit jobs I've been on - the places where you frequently find such violations committed by maintenance people(presumably)jamming another 1/2 or 3/4 in an existing rack.

[This message has been edited by Elzappr (edited 02-04-2003).]

Re: Spacing between conduits, etc... #83507
02/04/03 02:08 PM
02/04/03 02:08 PM
Redsy  Offline
Joined: Mar 2001
Posts: 2,056
Bucks County PA
NECA's National Electrical Installation Standards #1-2000 (titled "Good Workmanship in Electrical Contracting")has a table that shows spacing for various size conduits. I can't print the table, but it states that these dimensions will allow 1/4" between locknuts.

Re: Spacing between conduits, etc... #83508
02/04/03 06:00 PM
02/04/03 06:00 PM
Elec_VA  Offline
Joined: Jan 2003
Posts: 40
Sterling, VA, USA
I agree with iwire. I take all the penetrations that I know of and just lay it out depending on the size of the conduit and where it is coming from and the largest part of the connector. Then I try to leave as much room as possible for new pipe. You always need to run it, it seems [Linked Image]

Re: Spacing between conduits, etc... #83509
02/05/03 09:12 AM
02/05/03 09:12 AM
Joe Tedesco  Offline OP
Joined: Oct 2000
Posts: 2,749
Boston, Massachusetts USA
Redsy was kind enough to take time out of his busy schedule to send this in for us to review:

[Linked Image]

Note: I used the 310 reference only as a way to get to a rule that was related.

[This message has been edited by Joe Tedesco (edited 02-05-2003).]

Joe Tedesco, NEC Consultant
Re: Spacing between conduits, etc... #83510
02/19/03 09:47 AM
02/19/03 09:47 AM
emike  Offline
Junior Member
Joined: Feb 2003
Posts: 1
I use to use the lock-nuts and space them out on top of the panel. I saw the Marksman tool in one of the magazines and bought one. It gives perfect spacing any size to any size with 7/8" spacing for tight work or 1 1/8" spacing for places where a lot of retrofit work is done. It also spaces the center of conduit from the wall allowing for 7/8" or 1 5/8" strut. THIS TOOL IS AWESOME!

Re: Spacing between conduits, etc... #83511
02/20/03 01:07 AM
02/20/03 01:07 AM
nesparky  Offline
Joined: Jun 2001
Posts: 642



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