Supporting wireway detail

[Tainted]

I am drawing up plans for wireway runs...

Does anybody have a wireway support detail for horizontal and vertical runs?

Not really sure the materials and how supported with unistrut. All it needs is unistrut, threaded rods, and bolts? that's it?

 

[infinity]

How will it be mounted, opening facing, down, up, or to the side?

 

[Tainted]

How will it be mounted, opening facing, down, up, or to the side?

Not sure what you mean by opening facing down up or to the side.

Do you mean which sides will the wires be accessible? If so then:

Vertical wireways will have wires accessible in the front
horizontal wireways will have wires accessible from all sides.

 

[infinity]

Vertical wireways will have wires accessible in the front
horizontal wireways will have wires accessible from all sides.

A standard wireway has only one side with a removable cover. On a horizontal run which way will the opening face with the cover removed? If it's facing up then you will need strut to make a " trapeze" to support it from the bottom. If it's facing down then you can just hang it on rod without the strut.

 

[tom baker]

A horizontal wireway can not be accessible from all sides.
Wireways have one side that is removeable or hinged
Hoffman web site is a good resource

 

[Tainted]

A standard wireway has only one side with a removable cover. On a horizontal run which way will the opening face with the cover removed? If it's facing up then you will need strut to make a " trapeze" to support it from the bottom. If it's facing down then you can just hang it on rod without the strut.

Got it, thanks.

I think it's better for the horizontal wireway to be accessible from the top. Is there any detail out that that I can use? not sure how to hang it without a strut using just a rod

 

[infinity]

Got it, thanks.

I think it's better for the horizontal wireway to be accessible from the top. Is there any detail out that that I can use? not sure how to hang it without a strut using just a rod

If the removable cover opening is on top then you would just make a trapeze with a section of strut on the bottom and two rods. Similar to hanging a rack of conduit.

 

[Tainted]

If the removable cover opening is on top then you would just make a trapeze with a section of strut on the bottom and two rods. Similar to hanging a rack of conduit.

do I need to screw the trapeze section onto the wireway?

 

[tom baker]

If it’s close to a wall use wall angle brackets
Hoffman may have a hanger bracket.

 

[infinity]

do I need to screw the trapeze section onto the wireway?

For a horizontal application IMO no. The NEC requires securing for a vertical support.

376.30(A) Horizontal Support.
Wireways shall be supported where run horizontally at each end and at intervals not to exceed 1.5 m (5 ft) or for individual lengths longer than 1.5m (5 ft) at each end or joint, unless listed for other support intervals. The distance between supports shall not exceed 3 m (10 ft).

376.30(B) Vertical Support.
Vertical runs of wireways shall be securely supported at intervals not exceeding 4.5 m (15 ft) and shall not have more than one joint between supports. Adjoining wireway sections shall be securely fastened together to provide a rigid joint.

 

[Tainted]

For a horizontal application IMO no. The NEC requires securing for a vertical support.

Strange how they don't want to secure horizontally...

 

[infinity]

Strange how they don't want to secure horizontally...

You could argue that if can't fall up. I would secure it required or not. Drill one hole with a bolt and a spring nut is about 5 minutes.

 

[tom baker]

do I need to screw the trapeze section onto the wireway?

The NEC article on wireways will have the support requirement, as well as the mfg requirements.