Conduit support with boxes on every purlin

Status
Not open for further replies.
storeytime

storeytime

Member
Location
Texas
I know that NEC 358.30, Exception 1 allows for supporting conduit at 5' from box that is mounted on a purling and the next purlin is within that 5' distance.
I have a situation where there is a box on every purlin with conduit in between. Total of 12 boxes, each mounted on purlin with conduit between each box. Do I have to use one of those Caddy fasteners like in the picture? Are there any other methods besides this?
 

Attachments

  • Caddy 812MB18A.jpeg
    Caddy 812MB18A.jpeg
    25.6 KB · Views: 34
infinity

infinity

Moderator
Staff member
Location
New Jersey
Occupation
Journeyman Electrician
I have used those Caddy bars. Honestly if the box is screwed to the purlin those bars are pretty useless. They do satisfy the code requirement so that's why we use them.
 
T

Tulsa Electrician

Senior Member
Location
Tulsa
Occupation
Electrician
I call them cheater bars.
I dislike them.
We do a S
12" Inch 90 back to back then run the next the other way. Boxes line up. Minies or one holes. Depending on your liking.
It does use more pipe versus cheater bars with 5' center to center purlins. One may out way the cost of the other.
 
infinity

infinity

Moderator
Staff member
Location
New Jersey
Occupation
Journeyman Electrician
Tulsa Electrician said:
We do a S
12" Inch 90 back to back then run the next the other way. Boxes line up. Minies or one holes. Depending on your liking.
Click to expand...
How do you support the raceway with the 90's? Seems like a lot of extra labor to save buying a cheap Caddy bar.
 
T

Tulsa Electrician

Senior Member
Location
Tulsa
Occupation
Electrician
Keep in mind this is how it was done prior to cheater bars.
Rough sketch.
Pipe and wire used to be cheap.
 

Attachments

  • Screenshot_20230501-185835.png
    Screenshot_20230501-185835.png
    312.6 KB · Views: 51
infinity

infinity

Moderator
Staff member
Location
New Jersey
Occupation
Journeyman Electrician
Tulsa Electrician said:
Keep in mind this is how it was done prior to cheater bars.
Rough sketch.
Pipe and wire used to be cheap.
Click to expand...
Ahh got it. For some reason I thought that the elbows went in and out of the back of the boxes. Like I said prior these Caddy bars don't do much but they do help to streaming the installation and also in pulling in the wire.
 
J

jap

Senior Member
Occupation
Electrician
Running shallow strut the full length across the purlins seems like a huge overkill.

I'd find a different way to run my pipe if that was what I had to resort to.

JAP>
 
storeytime

storeytime

Member
Location
Texas
jap said:
Running shallow strut the full length across the purlins seems like a huge overkill.

I'd find a different way to run my pipe if that was what I had to resort to.

JAP>
Click to expand...
We can't trapeze because it would block the lighting, so we have no choice but to run the conduit across the purlins. 4 rows, 60' long each, box with receptacle on each purlin. 12 in each run. I looked into the unistrut versus Caddy hangers. It would make about a + $500 difference to run the strut, and that's not counting the spring nuts, bolts, washers, etc.
Strathead said:
Well, it just shows that code required supporting is often times unnecessary.
Click to expand...
Exactly!
 
J

jap

Senior Member
Occupation
Electrician
storeytime said:
I know that NEC 358.30, Exception 1 allows for supporting conduit at 5' from box that is mounted on a purling and the next purlin is within that 5' distance.
I have a situation where there is a box on every purlin with conduit in between. Total of 12 boxes, each mounted on purlin with conduit between each box. Do I have to use one of those Caddy fasteners like in the picture? Are there any other methods besides this?
Click to expand...

I haven't looked it up but Is the conduit not considered supported by the connector in the box?

JAP>
 
Status
Not open for further replies.
Top