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#24696 - 04/20/03 02:43 PM Greenhouses
Obsaleet Offline
Member
Registered: 04/05/03
Posts: 362
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.

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#24697 - 04/20/03 04:25 PM Re: Greenhouses
BPHgravity Offline
Member
Registered: 04/08/03
Posts: 139
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!
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#24698 - 04/20/03 05:36 PM Re: Greenhouses
Obsaleet Offline
Member
Registered: 04/05/03
Posts: 362
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?
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#24699 - 04/20/03 07:56 PM Re: Greenhouses
txsparky Offline
Member
Registered: 05/25/01
Posts: 552
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 ?
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#24700 - 04/20/03 11:33 PM Re: Greenhouses
nesparky Offline
Member
Registered: 06/21/01
Posts: 642
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.
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#24701 - 04/21/03 01:30 PM Re: Greenhouses
spyder Offline
Member
Registered: 10/14/02
Posts: 210
Loc: Massachusetts
If you use PVC conduit, consider expansion couplings.
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#24702 - 04/21/03 04:34 PM Re: Greenhouses
Obsaleet Offline
Member
Registered: 04/05/03
Posts: 362
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.


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#24703 - 04/22/03 11:34 AM Re: Greenhouses
kale Offline
Member
Registered: 11/08/02
Posts: 174
I would seriously recommend going with the PVC, if allowed. The humidity in the air will rust your EMT.
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