Strap vs back strap for conduits

[FaradayFF]

Greetings,

What are the benefits of using clamp back spacers with a clamp versus directly connecting conduit to a concrete structure using a clamp ?

Thanks,
EE

 

[LarryFine]

EE, can you find and post a pic of each type you're talking about?

 

[Knuckle Dragger]

Greetings,

What are the benefits of using clamp back spacers with a clamp versus directly connecting conduit to a concrete structure using a clamp ?
Are you inquiring about the difference between mineralac and one clips? What size be conduit, indoor or outdoor installation.

 

[MAC702]

If it's what I'm picturing, less or sometimes no box offset is the first advantage I think of, and room for condulets and couplings between pipe and wall. Another advantage is that minor wall imperfections between clamps won't affect the conduit.

https://www.hardwareonlinestore.com...9cO4ifi8iffS81x4L-tVPSxB3o0rH1FRoCe-IQAvD_BwE

 

[hbiss]

Back straps space the conduit off the surface it's run on. Normally you would use them in areas where the walls are washed down to keep dirt from being trapped between the conduit and wall. They are also useful to eliminate offsets when bringing conduit into a box or fitting.

Back straps are usually galvanized malleable iron and used with malleable one-hole straps.

-Hal

 

[oldsparky52]

Back straps space the conduit off the surface it's run on.

-Hal

What Hal said

 

[oldsparky52]

You would need something like a backstrap to comply with 300.6(D). I thought at one time these were required on all wet location horizontal installations, but I couldn't find a code reference.

 

[PaulMmn]

If the concrete wall is in a basement, spacers will keep the conduit dryer, and less prone to rusting.

 

[Fulthrotl]

What Hal said

what oldsparky said hal said.

you don't have crud build up as much between the wall and pipe,
and washdowns go better.

also, a malleable iron strap is usually designed to work with a
backstrap, and doesn't fully encircle the conduit for that reason.