ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Top Posters(30 Days)
Recent Posts
2017 NEC Changes
by HotLine1. 12/11/17 12:10 PM
Casino Wiring methods
by HotLine1. 12/09/17 10:44 AM
Ground wire Size to water Line.
by HotLine1. 12/05/17 12:11 PM
Flexible conduit to an outside Spa
by gfretwell. 12/05/17 12:28 AM
Dimmable LED 2x4 lay in fixtures
by Vulsion. 11/30/17 06:37 PM
New in the Gallery:
Gallery Test
Popular Topics(Views)
243,007 Are you busy
179,399 Re: Forum
170,361 Need opinion
Who's Online Now
0 registered members (), 27 guests, and 12 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate This Thread
Page 1 of 3 1 2 3
#187981 - 07/15/09 10:17 PM Older twistlock and other odd receptacle  
junkcollector  Offline
Joined: Apr 2007
Posts: 36
Central MN
Moderators, if you could move this to the electrical nostalgia section...Thanks.

I was rummaging through some old devices that I had lying around the other day and came across this older Hubbell Twistlock Receptacle. I've seen many of these installed in older buildings, and I'm assuming that this one predates the nema standard for locking devices. A modern NEMA L5-15 R has a little hook in on the ground slot so this one looked a little odd to me. It carries a dual voltage rating as well. (these are a little before my time)

[Linked Image]
I got also a bunch of these single Hubbell (and some A-H)receptacles that have a really odd mount. They were in a box of really old electrical stuff at a garage sale. At first you would think that this could fit a raised cover with an opening for a single receptacle, however, the mounting tabs are about a 1/4" too small. I have no idea what these could have been used for, maybe some older plugmold type strip or something. (I have an "adjustment yoke" for a blank cover lying next to it for a gauge)

[Linked Image]

[Linked Image]

Tools for Electricians:

#187985 - 07/15/09 11:37 PM Re: Older twistlock and other odd receptacle [Re: junkcollector]  
NORCAL  Offline
Joined: Sep 2002
Posts: 874
If you were to take a locking type photocell & compare the configuration of it and the one in the top picture, they are the same, & the receptacle in 2nd pic. is a floorbox receptacle.

#188039 - 07/17/09 11:20 PM Re: Older twistlock and other odd receptacle [Re: NORCAL]  
Joined: Mar 2004
Posts: 251
Kingwood, TX USA
I have a box of those Twist loc rec. It is a non grounding type. They were common used during the late 1950 & 60's on fire apparatus. Used on fans & lights. They made a 2 conductor also. They were frequently miss wired as the screws on the early models were not identified. I was in a fire dept that used these. Several of the lights were mis-wired. When you started the generator on the pumper and stretched the cord to a light set on the (wet) ground, if you touched the truck, you got a tingle. One pole was grounded in the generator and the other on the light. Replaced them all with grounded and properly wired TL.

#188053 - 07/19/09 09:30 PM Re: Older twistlock and other odd receptacle [Re: WESTUPLACE]  
JBD  Offline
Joined: Jul 2001
Posts: 599
"Old style" (non-grounding) twist lock devices are still available from most manufacturers.

#188423 - 08/07/09 08:31 PM Re: Older twistlock and other odd receptacle [Re: JBD]  
busbar  Offline
New Member
Joined: Nov 2008
Posts: 1
Way Out West

Re the first picture—up to the early 1970s in northern California, these were used extensively on construction sites. At temporary power poles, typically there were a pair of these, one receptacle was labeled “110” and the other was labeled “220”. That way extension cords could be used for either voltage. (Never mind the hazards.)

This was at a time when CALOSHA was just comin’ up to steam, and inspectors were busy with site inspections and issuning citations.

#188429 - 08/08/09 03:38 AM Re: Older twistlock and other odd receptacle [Re: junkcollector]  
Trumpy  Offline

Joined: Jul 2002
Posts: 8,223
SI,New Zealand
Good stuff,
Junk collector.
I fail to see however, how this is junk.

One thing I love about the older sockets and the like is the small designs used to adorn something like a receptacle.
Like the front face of the recept in your second picture, someone designed that, who I have no idea, but at the time that would have looked good.

To most people that is somewhere where you put your plug in to get something to work.

It's a shame that only electricians appreciate the work that went into these devices. frown

#189807 - 10/26/09 02:16 AM Re: Older twistlock and other odd receptacle [Re: Trumpy]  
wa2ise  Offline
Joined: Nov 2002
Posts: 784
Oradell NJ USA
[Linked Image]
Here's an old outlet in my mom's place. Turns out Australian plugs will fit, and as this one is fed by 240VAC, the Australian plug would feel nearly at home. Except for the 60Hz, and that both current carrying pins (that's the slanted ones, the vertical one is the ground) are hot with 120VAC. In Australia, one is a neutral, and the hot is 240V 50Hz.

#189828 - 10/26/09 08:47 PM Re: Older twistlock and other odd receptacle [Re: wa2ise]  
junkcollector  Offline
Joined: Apr 2007
Posts: 36
Central MN
That is a neat receptacle, Wa2ise. I've seen a few of those, but they were wired for 120. A hardware store near me still has the single version of that style, and the NEMA 10-20. I think they have plugs for each variety, too. I actually have an adaptor with that crowfoot pattern, so that you can plug the crowfoot into a standard receptacle.

Good stuff...

#189857 - 10/28/09 08:07 AM Re: Older twistlock and other odd receptacle [Re: junkcollector]  
n1ist  Offline
Joined: Feb 2002
Posts: 183
Malden MA
Back in my elementary school, we had crowsfoot for 110DC and regular for AC (or was it the other way around? Too long ago :-)

#189871 - 10/28/09 02:34 PM Re: Older twistlock and other odd receptacle [Re: n1ist]  
ghost307  Offline
Joined: May 2005
Posts: 919
Chicago Illinois USA
All our 120V stuff at Ford was fitted with a weird twist-lock pin-and-sleeve plug that fitted into matching weird receptacles.
I know that whacking off the plug of a new tool to install an oddball plug sounded dumb, but we stopped 'losing' electric drills and other small power hand tools almost immediately after the policy was adopted.


Page 1 of 3 1 2 3

Member Spotlight
Bill Addiss
Bill Addiss
Posts: 3,878
Joined: October 2000
Show All Member Profiles 

2017 Master Electrician Exam Preparation Combos
2017 NEC Electrician
Exam Prep Combos:
Master / Journeyman


Shout Box
Powered by UBB.threads™ PHP Forum Software 7.6.0
Page Time: 0.016s Queries: 16 (0.002s) Memory: 0.8223 MB (Peak: 1.0022 MB) Zlib enabled. Server Time: 2017-12-11 23:05:24 UTC