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

Topic Options
Rate This Topic
#103731 - 11/07/02 08:11 AM Mist Cooling System Pump Location
Joe Tedesco Offline
Member
Registered: 10/07/00
Posts: 2749
Loc: Boston, Massachusetts USA


A high pressure pump used for a mist cooling system is in this enclosure that is laying on the ground.

In a heavy rain the motor could be easily submerged in water.

Any experiences, comments or suggestions? How about the receptacle cover?

[This message has been edited by Joe Tedesco (edited 11-07-2002).]
_________________________
Joe Tedesco, NEC Consultant
Top
2017 / 2014 NEC & Related Books and Study Guides
#103732 - 11/07/02 09:09 AM Re: Mist Cooling System Pump Location
mamills Offline
Member
Registered: 11/30/01
Posts: 745
Loc: Wharton, Texas, USA
Joe:
Well, here goes my two cents worth...
I've seen a lot of discussion on ECN about using "bubble covers" on outdoor receptacles, so I would assume that one is called for here. If there is concern about the pump/motor being submerged, wouldn't simply placing it on a taller base (or better yet, fastening it more or less permanently in place to prevent an accidental fall into the water). Is this even a suitable location (outside)for something like this? The enclosure, as is, is certainly not watertight, what with the penetrations for the low and high pressure hoses, and possibly the power cord as well. Then there is the problem of the motor overheating from lack of ventilation.

I am concerned about the close proximity of the receptacle to the faucet. It is not at all uncommon for water to spray out of hose fittings as well as the packing around the valve handle. In this case, would a bubble cover even be enough to prevent water from entering the receptacle?

Mike (mamills)
Top
#103733 - 11/07/02 09:33 AM Re: Mist Cooling System Pump Location
SvenNYC Offline
Member
Registered: 08/19/02
Posts: 1691
Loc: New York City
And the receptacle (next to the spigot) isn't a GFCI....

Isn't that socket a bit too close to the spigot? What if the water connection springs a leak at the hose coupling?
Top
#103734 - 11/07/02 10:38 AM Re: Mist Cooling System Pump Location
txsparky Offline
Member
Registered: 05/25/01
Posts: 552
Loc: Magnolia,.Texas U.S.A.
That looks like the motor and pump mounted externally to the side of a pvc j-box.What purpose does the j-box serve?(maybe a filter inside )The pump looks like a submersible,though I could be wrong.
It definitely needs a gfci receptacle and an in-use cover.What does the other cord feed?(an irrigation controller)?
_________________________
Donnie
Top
#103735 - 11/07/02 04:08 PM Re: Mist Cooling System Pump Location
John Steinke Offline
Member
Registered: 04/03/01
Posts: 518
Loc: Reno,Nv., USA
I may be wrong, but...
By "mist cooling," as well as the appearance of this unit, I'm going to guess that this is a device attached to a machine tool, and is used to spray a mist on the area where the cutting tool meets the metal.
If that is so, the item on the outside of the box is simply a filter. The (much smaller) pump is inside the box- if there even is one. (Many of these units are powered by compressed air). The box would also include relays, etc., to automatically control the unit.
I would ask why the unit wasn't mounted on the wall. I agree that this would be a good place for a "bubble" cover and GFI. The enclosure is almost certainly NEMA-4X, and thus capable of keeping out a surprising amount of water, even if it isn't technically a "submersible" enclosure. That's assuming that the penetrations are properly sealed- which I doubt.
I'd like to ask: IF you were to mandate a distance between water taps and outlets, how would you prhase it?
Top
#103736 - 11/07/02 05:33 PM Re: Mist Cooling System Pump Location
Joe Tedesco Offline
Member
Registered: 10/07/00
Posts: 2749
Loc: Boston, Massachusetts USA
The principle behind misting is to create a "curtain" of mist around the perimeter of a patio cover or sitting area. As the mist flash-evaporates it will draw hot air out of the area creating what is called a cool zone. At the same time the curtain acts as a barrier to keep hot air from intruding on the cool zone.
_________________________
Joe Tedesco, NEC Consultant
Top
#103737 - 11/12/02 04:38 PM Re: Mist Cooling System Pump Location
John Steinke Offline
Member
Registered: 04/03/01
Posts: 518
Loc: Reno,Nv., USA
Thanks, Joe. I really mis-understood the application.
Top

Member Spotlight
Member Since: 04/03/02
Posts: 6776
New in the Gallery:
SE cable question
Featured:

2017 NEC and Related
2017 NEC
Now Available!

Shout Box


Who's Online
1 registered (gfretwell), 48 Guests and 10 Spiders online.
Key: Admin, Global Mod, Mod
 
New in the Gallery:
SE cable question
 
Top Posters (30 Days)
Admin 47
HotLine1 43
gfretwell 19
Ruben Rocha 12
Trumpy 9
 
Newest Members
Freecrowder, clee512, Jdscott2005, FAIZAN, Regitest2

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