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

Topic Options
Rate This Topic
#99516 - 08/08/06 08:33 AM NEC requirements for installing twist lock receptacle
Christopher.Banbury Offline
Junior Member
Registered: 08/07/06
Posts: 6
Loc: Brooksville, FL, USA
What is the minimum box volume required for a L5-30R receptacle? This is a 125V, 30A, single phase twist-lock receptacle. Is a 4" box required or is a 2" single gang box acceptable. Also are there any special mounting requirements due to the twisting action required. Can the box be tabbed directly to the drywall opening with no attachment to wall framing (for after the fact installation). Thanks in advance.
_________________________
Christopher Banbury, PE
President
Ark Engineering, Inc.
PO Box 10129, Brooksville, FL 34603
22 N. Broad ST, Brooksville, FL 34601
Phone: (352) 754-2424
FAX: (352) 754-2412
http://www.arkengineering.net
Top
2017 / 2014 NEC & Related Books and Study Guides
#99517 - 08/08/06 08:52 AM Re: NEC requirements for installing twist lock receptacle
gfretwell Offline


Member
Registered: 07/20/04
Posts: 9066
Loc: Estero,Fl,usa
The manufacturer may have instructions but the NEC is silent on the mounting. Box fill is 2 conductors allowance, same as any device. That doesn't mean it will fit.
Common sense says use a box that has enough room and mount this securely. Twist lock implies there will be some extra strain on the cord and you won't simply pull out the plug cap. We used a lot of twist lock and usually put them in a 4" box with 4 screws per device.
_________________________
Greg Fretwell
Top
#99518 - 08/08/06 09:57 AM Re: NEC requirements for installing twist lock receptacle
Dnkldorf Offline
Member
Registered: 12/12/04
Posts: 1091
Loc: nowhere usa
Quote:
Can the box be tabbed directly to the drywall opening with no attachment to wall framing (for after the fact installation).


Depends, I learned here that if you are cutting into a firewall, the box must be attached to the framing of the wall.

I think Roger or Bob(iwire) have the link, it is not in the code book, but a building code if memory serves me right.
Top
#99519 - 08/08/06 03:26 PM Re: NEC requirements for installing twist lock receptacle
Jim M Offline
Member
Registered: 08/10/01
Posts: 453
Loc: Chestertown, MD, USA
Iwould use a deep 1Gbox to allow the wires some room.

If you are worried about the twisting working the old work box loose after awhile look at using one of the new smart box style old works that screw to the side of the stud.

Arlington makes one, check www.aifittings.com or www.smartbox.com for another brand.
Top

Featured:

2017 NEC and Related
2017 NEC
Now Available!

Shout Box

Recent Posts
Looking for older post
by sparkyinak
Today at 12:27 AM
License exam
by TRUE POWER
Yesterday at 11:33 PM
Members: Non-Members: Did you know?
by Admin
Yesterday at 02:34 PM
Safety at heights?
by HotLine1
01/21/17 08:51 PM
International Wire Colour Codes
by Texas_Ranger
01/21/17 03:29 PM

Who's Online
0 registered (), 69 Guests and 10 Spiders online.
Key: Admin, Global Mod, Mod
New in the Gallery:
Desk-mounted "power-board"
Top Posters
gfretwell 9066
Trumpy 8560
pauluk 7693
HotLine1 6833
sparky 5545
Member Spotlight
Tom
Tom
Member Since: 01/01/01
Posts: 1069

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