I've never had a problem doing this. While I see the theoretical issues you state, in practice it works.
The issue you are describing is caused by a defective outlet or wiring job. While it happens, it is no more or less likely than your 117VAC outlet having the same issue with it's ground. If you assume every outlet is defective, then you will need isolation transformers everywhere... US 3 prong 240VAC outlets are wired as hot/hot/neutral with a strap on the device grounding the chassis metal to the neutral as a ground. This was standard. In most areas, new 240VAC outlets are wired as 4 prong hot/hot/neutral/ground and new devices are wired with a 4 prong cord. Most devices can have a 3 prong cord installed by following the device instructions. -- On 11/6/2014 7:00 PM, [email protected] wrote: > On Thu, 06 Nov 2014 18:19:44 -0500 > Blair Davis <[email protected]> wrote: >> Set your device for 220-240VAC Many devices have a switch on the >> power supply for this. Some devices simply have an input range of >> 100-250VAC. >> Tie your device hot to leg 1 >> Tie your device neutral to leg 2 >> Tie your device ground to the neutral/ground of the power outlet. >> >> Can you post a picture of the outlet and of the power cord recptical >> on your device? >> > > While this should work in theory you cannot assume that > neutral and ground are the same. The farther you get from the service > the greater the possibility that neutral varies from ground, and if > you have a corroded junction somewhere between your location and the > bonding point > you can have significant voltage on neutral. Just try and make digital > equipment work if your feed 5-10 volts AC in on the ground. > > To do this properly requires an isolation transformer to separately > derive the source and > a new bonding point or better yet a four wire source pigtail where > neutral and ground are > separately presented on the plug. (Be careful about over current > protection.) > > I've had to do this in a remote locations with 240 V generator. > I used a one-to-one isolation transformer with a center tap. The > primary is connected to > the two hot legs. The secondary center tap is bonded to earth ground > and both neutral > and ground originate at that point. 110 is present on either end of > the secondary relative > to the center tap. > The whole thing has to go to a fuse/breaker box for protection. All in > all if there is > service anywhere close it's easier and cheaper to hire an electrician > to drop a 110 > receptacle close by. Fires and/or electrocuted kids/pets are a PR > problem of the first order. > > Larry Ash > Mountain West Technologies Corp. >> -- >> >> >> >> >> On 11/6/2014 2:40 PM, Scott Carullo wrote: >>> Ok... sorry to beat this horse but I'm apparently not following you. >>> There are three lugs my shiny new male plug has. >>> 1-120v leg1 from single phase source >>> 2-120v leg2 from single phase source >>> 3- Neutral wire which bonds to ground at building main panel from >>> power company. >>> Cloud Core has three wires feeding the power supply. >>> 1-120v leg (1 or 2) from single phase source >>> 2-Neutral >>> 3-Ground >>> A) I completely understand how I can take a single 120v wire from >>> leg1 or leg2 of the power source and then take the neutral to both >>> neutral and ground of the router power supply and make this work - >>> thats easy - but not code. >>> B) I also understand how I could take a neutral, a ground and one >>> hot wire with voltage anywhere from 110-250v and it will work with >>> cloud core power supply. (but not I do not have this configuration >>> at source) >>> C) I do not understand how you can take two hots and a neutral and >>> turn that into anything (just by using a cable) that the router can >>> use unless that cable is doing nothing more than what I described >>> above in "A" >>> Thanks >>> Scott Carullo >>> Technical Operations >>> 855-FLSPEED x102 >>> >>> ------------------------------------------------------------------------ >>> >>> *From*: "Faisal Imtiaz" <[email protected]> >>> *Sent*: Thursday, November 06, 2014 8:53 AM >>> *To*: [email protected], "WISPA General List" >>> <[email protected]> >>> *Subject*: Re: [WISPA] Off topic sorta power question.... >>> Here is the info on AC power arrangement >>> http://www.oempanels.com/what-does-single-and-three-phase-power-mean >>> The CCR specs show it having : >>> Dualpowersuppliesforredundancy,110-250Vinput,IECconnectors >>> which means that, you can use either 110 or 220 or 240 on the same >>> power supply. >>> All you would have to do is match the power cables... >>> Regards. >>> Faisal Imtiaz >>> Snappy Internet & Telecom >>> 7266 SW 48 Street >>> Miami, FL 33155 >>> Tel: 305 663 5518 x 232 >>> Help-desk: (305)663-5518 Option 2 or Email: [email protected] >>> ------------------------------------------------------------------------ >>> >>> >>> *From: *"Scott Carullo" <[email protected]> >>> *To: *"WISPA General List" <[email protected]> >>> *Sent: *Wednesday, November 5, 2014 11:55:36 PM >>> *Subject: *Re: [WISPA] Off topic sorta power question.... >>> Cloud core. There is a difference between having a hot (80-250v), >>> a neutral and a ground, vs. a neutral and two 120v hots. I >>> believe the router can handle more than 120v but not in the sense >>> that its being delivered on two 120v legs with a neutral and no >>> ground. Its a 3 prong twist lock type receptacle. If there is a >>> way I'd like to be educated (aside from pulling one of the hots >>> and hooking the neutral to ground as well on my new non-code >>> engineered power cable. Educate me..... >>> I think I'm just going to plug it into the normal 120v 20amp plug >>> on the wall behind the rack though, seems like the best way >>> forward considering the options I was just trying to accommodate >>> the customers request prior to plan B. >>> Thanks >>> Scott Carullo >>> Technical Operations >>> 855-FLSPEED x102 >>> >>> ------------------------------------------------------------------------ >>> >>> *From*: "TJ Trout" <[email protected]> >>> *Sent*: Wednesday, November 05, 2014 3:21 PM >>> *To*: "WISPA General List" <[email protected]> >>> *Subject*: Re: [WISPA] Off topic sorta power question.... >>> >>> Everything can use 240 now days probably just need a new power cord >>> >>> On Nov 5, 2014 12:10 PM, "Bob M" <[email protected] >>> <mailto:[email protected]>> wrote: >>> >>> Keep in mind that it is breakered for 240. Splitting the legs >>> after a 240 vac circuit breaker is not code. >>> Sent from my Verizon Wireless 4G LTE smartphone >>> >>> >>> -------- Original message -------- >>> From: Brett Woollum <[email protected] >>> <mailto:[email protected]>> >>> Date:11/05/2014 12:00 PM (GMT-05:00) >>> To: WISPA General List <[email protected] >>> <mailto:[email protected]>> >>> Subject: Re: [WISPA] Off topic sorta power question.... >>> Tim, >>> >>> In most cases you can split the hot leads on the 240v outlet >>> into two 120v circuits. There are adapter pigtails for this if >>> you don't want to hardware it. >>> >>> >From memory, our local hardware store sells these (in the US). >>> >>> A quick Google search revealed this: >>> http://www.wayfair.com/Champion-Power-Equipment-Generator-Y-Adapter-for-Champion-Power-Equipment-48035-L771-K~CXP1067.html?refid=GX50899353420-CXP1067&device=c&ptid=75696510540&gclid=CJ_Fktv348ECFUdffgod3z4ANw >>> <http://www.wayfair.com/Champion-Power-Equipment-Generator-Y-Adapter-for-Champion-Power-Equipment-48035-L771-K%7ECXP1067.html?refid=GX50899353420-CXP1067&device=c&ptid=75696510540&gclid=CJ_Fktv348ECFUdffgod3z4ANw> >>> Brett Woollum >>> Senior Sales Engineer >>> [email protected] <mailto:[email protected]> >>> >>> *Tekify Broadband Internet Services* >>> Web: http://www.tekify.com >>> Phone: 510-266-5800 <tel:510-266-5800>, ext 6200 >>> ------------------------------------------------------------------------ >>> >>> *From: *"Tim Way" <[email protected] <mailto:[email protected]>> >>> *To: *[email protected] >>> <mailto:[email protected]>, "WISPA General List" >>> <[email protected] <mailto:[email protected]>> >>> *Sent: *Wednesday, November 5, 2014 7:50:52 AM >>> *Subject: *Re: [WISPA] Off topic sorta power question.... >>> I would think something like this might be the safer option: >>> http://www.certifiedmtp.com/step-up-step-down-transformer-500w/?gclid=CNWj1Kro48ECFQipaQodB74ADQ >>> >>> That said I'm not an electrician and I think that question >>> might be best answered by one. >>> Tim Way >>> On Wed, Nov 5, 2014 at 9:38 AM, Scott Carullo >>> <[email protected] >>> <mailto:[email protected]>>wrote: >>> >>> I need to place a 120v normal 1U router in a rack that >>> only has 240v twist lock receptacles available for >>> power. I need to put a UPS there so I just looked for a >>> 240v UPS >>> with the right plugs but because they are made for a lot >>> larger load they were way bigger (and more expensive) than >>> what I was looking for. SO... anyone have a better way to >>> do this? I have considered taking one leg and bonding the >>> neutral and ground, but..... >>> Thanks >>> Scott Carullo >>> Technical Operations >>> 855-FLSPEED x102 >>> >>> >>> _______________________________________________ >>> Wireless mailing list >>> [email protected] <mailto:[email protected]> >>> http://lists.wispa.org/mailman/listinfo/wireless >>> >>> >>> _______________________________________________ >>> Wireless mailing list >>> [email protected] <mailto:[email protected]> >>> http://lists.wispa.org/mailman/listinfo/wireless >>> >>> _______________________________________________ >>> Wireless mailing list >>> [email protected] <mailto:[email protected]> >>> http://lists.wispa.org/mailman/listinfo/wireless >>> >>> >>> _______________________________________________ >>> Wireless mailing list >>> [email protected] >>> http://lists.wispa.org/mailman/listinfo/wireless >>> >>> >>> >>> _______________________________________________ >>> Wireless mailing list >>> [email protected] >>> http://lists.wispa.org/mailman/listinfo/wireless >> >> -- >> West Michigan Wireless ISP >> Allegan, Michigan 49010 >> 269-686-8648 >> >> A Division of: >> Camp Communication Services, INC >> > > Larry Ash > Senior Network Engineer > Mountain West Telephone > 123 W 1st St. > Casper, WY 82601 > Office 307 233-8387 > > -- West Michigan Wireless ISP Allegan, Michigan 49010 269-686-8648 A Division of: Camp Communication Services, INC _______________________________________________ Wireless mailing list [email protected] http://lists.wispa.org/mailman/listinfo/wireless
