Conduit supported by vent hood thread rod

[DrSparks]

Can anyone think of a reason that I wouldn’t be able to use the threaded rod supporting the vent hood to support the conduits associated with those hoods?

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[LarryFine]

I do it regularly, with tie-wraps or bat-wings.

 

[gadfly56]

I do it regularly, with tie-wraps or bat-wings.

Barring local ordinances/amendments, I would agree. However, there might be some restrictions in the contract or specifications and drawings, and at the least give the mechanical a courtesy heads up, especially if the duct work is not complete; he may be intending to hang more of his work from that all-thread.

 

[DrSparks]

Definitely no specs for this job! Thanks guys


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[DrSparks]

Conduit supported by vent hood thread rod

Also another quick question. The exhaust is controlled by one of the snap switches pictured. Isn’t the exhaust supposed to turn on automatically by heat detectors or timers? Also can I use simple contactors to tie into ansul system?


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[Fulthrotl]

Can anyone think of a reason that I wouldn’t be able to use the threaded rod
supporting the vent hood to support the conduits associated with those hoods?

around here, you can't use ceiling wires to support wiring, they have to be
on their own supports, but this not being ceiling wires, i don't think that applies.

i'd ask your inspector.

 

[goldstar]

Also another quick question. The exhaust is controlled by one of the snap switches pictured. Isn’t the exhaust supposed to turn on automatically by heat detectors or timers? Also can I use simple contactors to tie into ansul system?

I made up this sequence of operation from the last job I did that had two electric ovens back to back (hope this helps):

Hood & Extinguishing System
Sequence of Operation Under Normal Conditions

• Operation of wall switch turns on both exhaust and make-up air fans
• Operation of a second wall switch turns on hood light only when fans are on
• If fans are not turned on manually, hood thermostat(s) will activate both fans

Sequence of Operation Upon
Manual Extinguisher Release

Micro-switch contact in extinguisher panel will operate auxiliary relays in electric panel resulting in the following :
• Exhaust fan turns on or remains on
• Make-up air fan shuts down
• Both hood lights turn off
• Both electric ovens turn off via shunt-trip circuit breakers in breaker panel B

Notes :

1. Fire alarm system will be triggered via a second micro-switch in the Ansul panel.
2. 2. There are two cooking areas in this building and two exhaust hoods (one for each area). Electric range/ovens are back to back divided by a masonry wall. However, extinguishing system, duct work, exhaust and make-up air fans are common for both cooking areas.