Electrical Conduit Hangers
6

Question

Electrical Conduit Hangers

dik (Structural)

(OP)

22 Nov 23 00:11

I'm looking at suspending some electrical conduit hangers from the underside of a bridge and was wondering about using pipe hangers like the sketch with a slight skew to the hangers for wind resistance. I was thinking about using 10 degrees slope in both directions. I'm planning on using SS for everything and 3/8" threaded rod hangers. They would be attached to the underside of the bridge using Hilti HIS-RN inserts and HILTI epoxy for the threaded rod.

The conduit is about 6" dia semi-rigid fiberglass (with UV coating), and I'm thinking the supports will be about 5' o/c or whatever the conduit manufacturer suggests. Weight is slight.

Does anyone have a better solution or are their 'standard' types of hangers for this? It's covered by the bridge deck, but will still design for snow, ice and wind. Are there any supplemental loads that I should consider?

Thanks, Dik

-----*****-----
So strange to see the singularity approaching while the entire planet is rapidly turning into a hellscape. -John Coates

-Dik

SlideRuleEra (Structural) · Answer 1 · 2023-11-22 00:41:52

Dik - For bridges, fiberglass hangers for fiberglass conduit; believe this is tied to USA National Electrical Code requirements.

See this brand's catalog for good general info, including hanger spacing. The conduits are lightweight, but the electrical cables inside can be heavy.

dik (Structural) · Answer 2 · 2023-11-22 00:44:47

Thanks... didn't know that, or that it may be a code requirement... and use stainless fittings...

-----*****-----
So strange to see the singularity approaching while the entire planet is rapidly turning into a hellscape. -John Coates

-Dik

bridgebuster (Civil) · Answer 3 · 2023-11-23 12:39:22

dik - here are some examples used on bridges in NY. Utility companies in NYC prefer to have their conduits on wood blocking. Today, it's rare, at least in NYC, to see a utility supported from the deck.

https://files.engineering.com/getfile.aspx?folder=8405a507-ac61-4783-ac2f-a

ALK2415 (Structural) · Answer 4 · 2023-11-23 14:12:30

RE: Electrical Conduit Hangers

ALK2415 (Structural) 23 Nov 23 14:12

Hi Dik, check your email inbox ...

dik (Structural) · Answer 5 · 2023-11-23 14:12:44

Thanks, bridge...

-----*****-----
So strange to see the singularity approaching while the entire planet is rapidly turning into a hellscape. -John Coates

-Dik

bridgebuster (Civil) · Answer 6 · 2023-11-23 14:26:24

RE: Electrical Conduit Hangers

bridgebuster (Civil) 23 Nov 23 14:26

you're welcome dik

resqcapt19 (Electrical) · Answer 7 · 2023-11-23 16:07:42

"Fiberglass" conduit is covered in Article 355 of the National Electrical Code, Article 355 Reinforced Thermosetting Resin Conduit (RTRC). There are no specific requirements as to the types of support that can be used with RTRC.

dvd (Mechanical) · Answer 8 · 2023-11-23 21:57:37

Anvil Pipe Hangers

You might find some inspiration in the seismic bracing

TLHS (Structural) · Answer 9 · 2023-11-23 22:17:06

RE: Electrical Conduit Hangers

TLHS (Structural) 23 Nov 23 22:17

Sent you some references

dik (Structural) · Answer 10 · 2023-11-24 01:49:13

Thanks...

-----*****-----
So strange to see the singularity approaching while the entire planet is rapidly turning into a hellscape. -John Coates

-Dik

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Electrical Conduit Hangers
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