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
Industrail Control Panel bonding per 409.108
by sparkyinak
12/09/16 06:29 PM
Calling all Non-US members!! (Non-US only)
by aussie240
12/07/16 02:39 AM
Photo Upload Tutorial
by DanK
12/06/16 11:35 PM
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
New in the Gallery:
12.5A through 0.75mm˛ flex (just out of curiosity)
Shout Box

Top Posters (30 Days)
gfretwell 13
HotLine1 10
sparkyinak 9
Texas_Ranger 8
Potseal 6
Who's Online
0 registered (), 81 Guests and 4 Spiders online.
Key: Admin, Global Mod, Mod
Topic Options
Rate This Topic
#43659 - 10/19/04 08:37 AM Rain tight EMT requirements.
rad74ss Offline
Member

Registered: 04/19/04
Posts: 154
Loc: Pryor, OK USA
Does the new requirement for "rain tight" EMT fittings require a gasket between the fitting and the enclosure?

The sites I looked up that UL says are listed for making rain tight fittings either have gaskets at the knock out or gaskets that are ordered seperately.

As a side note. I have been told NEMA 3R enclosures are allowed to have water leak into them as long as they don't cause a short. It seems to me that you would want to do your best to keep water from leaking into any exterior mounted enclosure. Especially when the conduit entry is directly exposed to the weather. In this case a rooftop in Brooklyn.

Robert

While I'm on a roll, does an insulated throat in a connector (EMT/LT/GF) serve the same purpose as a plastic bushing, or is a bushing still/always required?

[This message has been edited by rad74ss (edited 10-19-2004).]

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....

#43660 - 10/19/04 10:02 AM Re: Rain tight EMT requirements.
rad74ss Offline
Member

Registered: 04/19/04
Posts: 154
Loc: Pryor, OK USA
To answer some of my own questions.

NEMA TYPE 3R

Rainproof and Sleet- (Ice-) Resistant-Outdoor-Type 3R enclosures are intended for use outdoors to protect the enclosed equipment against rain and meet the requirements of Underwriters' Laboratories, Inc., Publication No. UL 508, applying to "Rainproof Enclosures." They are not dust-, snow-, nor sleet (ice-)proof. They shall have conduit hub or equivalent provision for watertight connection at the conduit enctrance when the conduit enters at a higher level than the lowest live part, provision for locking, and provision for drainage. When completely and properly installed, these enclosures shall prevent the entrance of rain at a level higher than the lowest live part.

UL 508
PART II - ENCLOSURE CONSTRUCTION

ENCLOSURE TYPES

2,3,3R

(a) All holes cut by the panel manufacturer for conduit are below the live parts or conduit hubs as marked on the enclosure are used.

(b) No other openings are cut by the panel manufacturer unless the holes are closed with equipment marked for use with that type enclosure (see substitutions below) and installed in accordance with the instructions provided with the closing equipment.

Type Enclosure
3R
Openings may be closed by Equipment Marked
3,3S,4,4X,6,6P

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