The Electrical Contractor Network

ECN Electrical Forum
Discussion Forums for Electricians, Inspectors and Related Professionals

Books, Tools and Test Equipment for Electrical and Construction Trades

Register Now!

Register Now!

We want your input!

Featured:
   

2017 NEC and Related
2017 NEC
Now Available!

   
Recent Posts
Sprinklered equipment 26-008
by bigpapa
12/02/16 04:24 PM
On Delay Relay with Auto Reset
by Potseal
12/01/16 09:59 AM
Wow, that was close!
by jraef
11/28/16 07:06 PM
Earthquake in New Zeeland
by RODALCO
11/27/16 11:25 PM
Calling all Non-US members!! (Non-US only)
by Tjia1981
11/27/16 06:33 AM
New in the Gallery:
12.5A through 0.75mm˛ flex (just out of curiosity)
Shout Box

Top Posters (30 Days)
gfretwell 13
HotLine1 9
Texas_Ranger 8
Trumpy 8
sparkyinak 7
Who's Online
0 registered (), 81 Guests and 4 Spiders online.
Key: Admin, Global Mod, Mod
Topic Options
Rate This Topic
#24696 - 04/20/03 02:43 PM Greenhouses
Obsaleet Offline
Member

Registered: 04/05/03
Posts: 361
Loc: Pa
Any one familiar with wiring green houses? I am considering them damp locations. There are no sprinklers. But plenty of watering. They are being used for retail plant sales.

Ob
_________________________
Choose your customers, don't let them choose you.

Top
Work Gear for Electricians and the Trades

Work Gear for Electricians and the Trades
Work Gear for Electricians and the Trades
Arc Flash Clothing, Gloves, KneePads, Tool Belts, Pouches, Tool Carriers, etc. etc....

#24697 - 04/20/03 04:25 PM Re: Greenhouses
BPHgravity Offline
Member

Registered: 04/08/03
Posts: 141
Loc: Port Charlotte, Florida
I have done lots of work for agricultural facilities that contain greenhouses. They are definitely damp locations, if not a wet location with the use of sprinkler systems verses bed watering tub systems. The other concern is temperature derating of the current-carrying capacity of the conductors used to feed equipment. Sealtight (Article 356) and PVC (352) has always been the best choice for me. W/P connectors, boxes, and devices are also a must. Good Luck!
_________________________
Bryan P. Holland, ECO.
Secretary - IAEI Florida Chapter

Top
#24698 - 04/20/03 05:36 PM Re: Greenhouses
Obsaleet Offline
Member

Registered: 04/05/03
Posts: 361
Loc: Pa
Hey BP,
What about w/p covers and ground fault protection for lighting? Do i use "in use covers"? I'm thinking yes?
_________________________
Choose your customers, don't let them choose you.

Top
#24699 - 04/20/03 07:56 PM Re: Greenhouses
txsparky Offline
Member

Registered: 05/25/01
Posts: 578
Loc: Magnolia,.Texas U.S.A.
I've never wired a greenhouse, but what do you do about the caustic effects of the fertilizers and other chemicals used ?
_________________________
Donnie

Top
#24700 - 04/20/03 11:33 PM Re: Greenhouses
nesparky Offline
Member

Registered: 06/21/01
Posts: 650
Loc: omaha,ne
I also use PVC in green houses. Every thing that can be - conduit, boxes etc. Inuse covers for outlets that are 6' or below. I also cord and plug connect the luminares and support them from the structure. Temp derating is necessary. Also support the PVC conduit at least every 3' I use the plastic mini's.
If you keep the conduit and boxes sealed, you will not have a problem with chemicals.
But since you will almost always have a condensation problem you should arrange the conduit run to drain.
_________________________
ed

Top
#24701 - 04/21/03 01:30 PM Re: Greenhouses
spyder Offline
Member

Registered: 10/14/02
Posts: 211
Loc: Massachusetts
If you use PVC conduit, consider expansion couplings.

Top
#24702 - 04/21/03 04:34 PM Re: Greenhouses
Obsaleet Offline
Member

Registered: 04/05/03
Posts: 361
Loc: Pa
I am planning on using emt w/ compression fittings. The last house had emt w/ set screw and they were going strong for 20yrs. Till the roof come down, literally come down. 3' of snoww will do that. This place is more retail then, growing operation. The put the plants in and keep them alive till they sell. Very limited fertilzation, Etc.


Ob
_________________________
Choose your customers, don't let them choose you.

Top
#24703 - 04/22/03 11:34 AM Re: Greenhouses
kale Offline
Member

Registered: 11/08/02
Posts: 168
I would seriously recommend going with the PVC, if allowed. The humidity in the air will rust your EMT.

Top



ECN Electrical Forums - sponsored by Electrical Contractor Network - Electrical and Code Related Discussion for Electrical Contractors, Electricians, Inspectors, Instructors, Engineers and other related Professionals