Hang Conduit Below Roof Trusses

If metallic conduit or wiring needs to be placed near the roof assembly nrca recommends it be positioned and supported at least 11 2 inches from the bottom side of the roof deck or substrate to which the roof system is applied.

Hang conduit below roof trusses. Notches in solid lumber. The mc cable is 7 16 thick the space between the top of the truss and the roof is 1 1 2 2x4 on its side minimum space per the nec is 1 1 4. Since mc cable can t be bent sharply minimum bend radius of 7x the cable diameter i was going to go under the top truss member and put a mc strap on. It s part of the primary infrastructure of a lighting system and one of the unseen expenses of the system as well as one of the most dangerous parts.

R802 7 cutting and notching. The notching and boring rules for rafters are much different than the rules we ve learned for joists and studs. The good news is that we illustrate 3 time tested techniques for connecting unistrut channel to bar joists below which means you can choose the strategy that best suits your specific needs. Pipe truss and all of the equipment used to hang stuff from the building s structure is collectively called rigging and is one of the unsung heros of the lighting industry.

Conduit or wiring be embedded within roof assemblies or placed directly below roof decks. Structural roof members shall not be cut bored or notched in excess of the limitations speci fied in this section. Here s your code on rafters and trusses. Putting up runners or furring strips beforehand and planning for that in the design of the roof will usually solve the problem.

I want to go under the top member of the truss. Preparing roof trusses for hanging dry wall poses no particular difficulties but you need to understand the strength and stability limitations of drywall and plan your work accordingly. Also hangers or other supports used to attach and support metallic. If dead loads must be hung from trusses then extra support can be provided by installing support beams perpendicular to the trusses reducing the span of the bottom chords and increasing their ability to carry the weight load.

Truss t hanger is the new industry standard for hanging pipe electrical hvac fire suspension and more in open web bar joist. Truss t hangers are shaped like a t and unlike traditional hanging systems are installed by going through the middle of the truss and then being locked into place by a coupling device. A pdf illustrating the basic strategies for connecting unistrut to bar joists is also available for download by clicking here.