ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
ShoutChat Box
Recent Posts
Pool Lights?
by Papa - 09/18/20 05:26 PM
Ever been afflicted by Gout?
by mbhydro - 09/15/20 05:50 PM
Questioning the electrical norms
by gfretwell - 09/13/20 01:17 PM
120/208 gives 240? please clarify
by NORCAL - 09/13/20 01:08 AM
Lock-down Thread
by Trumpy - 09/11/20 11:17 PM
New in the Gallery:
Facebook follies, bad wiring
FPE in Germany pt.2
Who's Online Now
0 registered members (), 15 guests, and 9 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Another historical query #9720 05/10/02 03:47 PM
Joined: Aug 2001
Posts: 7,520
P
pauluk Offline OP
Member
I was watching an old movie ("The Five Pennies"), and at one point while on stage surrounded by audio gear Danny Kaye reaches down and takes a plug out of a receptacle on a box clearly labeled "110V AC" and plugs into into another labeled "220V DC," with the expected flash and bang.

Is this a case of Hollywood taking license for dramatic effect, or were the same recepts. used for 110 and 220 at one time? Just when did the various NEMA plug configuration in use today originate?

Work Gear for Electricians and the Trades
Re: Another historical query #9721 05/10/02 07:54 PM
Joined: Oct 2000
Posts: 5,389
S
sparky Offline
Member
Paul;
I do remember watching Danny K, and i have never been told, or read of any other commonly accepted residential voltage than 120V nominal.
There is a historical section @ NEMA , however it seems to be looking back due to a 75th aniversary......

[Linked Image from home.earthlink.net]
[Linked Image from ezboard.com]

Re: Another historical query #9722 05/10/02 09:13 PM
Joined: Jan 2002
Posts: 163
D
dana1028 Offline
Member
Paul says - "or were the same recepts. used for 110 and 220 at one time?" I have a photo of a Bryant 15A 125v/10A 250v recep just recently removed from a residence. Has the 125v blade configuration and can be wired 250v....so at one time there was at least this type of configuration...anyone could have plugged their 110 appliance into this 250v recep....I'd post the photo here 'cept I don't know how to post photos.

Re: Another historical query #9723 05/11/02 11:50 AM
Joined: Aug 2001
Posts: 7,520
P
pauluk Offline OP
Member
Thanks. That does seem to confirm that 120 and 240 did once share a configuration.

Steve,
I couldn't find anything on the NEMA site, but interesting nonetheless.

The part of the film where this happens is in a radio studio rather than a home, so I would guess the presence of 220V wouldn't be uncommon. Whether it would have been usual to have both AC and DC supplies at that time, I wouldn't know -- Maybe that part was Hollywood just emphasizing the difference.

Re: Another historical query #9724 05/11/02 11:21 PM
Joined: Apr 2002
Posts: 2,527
B
Bjarney Offline
Moderator
The side-by-side "110-" and "220-volt" outlets were identical on construction sites in some places during the sixties/early seventies. They were both wired with a common 3-wire 125/250-volt Twist-Lock receptacle, so if you saw an extension cord to plug into with your trusty wye adapter, you had to ask someone or follow the cord(s) back to the temporary power pole. At least they were usually plainly marked back there. {One guy’s Skilsaw worked with phenomenal torque until it burst into flames.} The ensuing ‘cutover’ enforcement [change to unique cords and receptacles] kept state DIS {pre-OSHA} inspectors busy for about a year.


[This message has been edited by Bjarney (edited 05-11-2002).]

Re: Another historical query #9725 05/12/02 09:35 AM
Joined: Aug 2001
Posts: 7,520
P
pauluk Offline OP
Member
I've not looked into all the industrial Twist-Lock devices in much detail, but I see there are still one or two of these which appear to have multiple uses, e.g. Leviton #3764-C & 3765-C, 4-wire rated 250V DC, 600V AC.

Re the Skilsaw incident, you might be interested to know that although 240V is standard here we do use a 110V safety supply for portable tools on building sites as a requirement of the HSE (Health & Safety Executive). It's fed from a center-grounded 55-0-55V xfmr, or on large sites 3-ph 63/110V.


Featured:

2020 National Electrical Code
2020 National Electrical
Code (NEC)

* * * * * * *

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

 

Member Spotlight
noderaser
noderaser
Portland, Oregon, United States
Posts: 404
Joined: March 2007
Show All Member Profiles 
Top Posters(30 Days)
Trumpy 8
NORCAL 3
Popular Topics(Views)
269,932 Are you busy
204,358 Re: Forum
192,577 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.7.3