Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Electrical

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Reply
 
Thread Tools Search this Thread Display Modes
Old 10-09-2011, 12:05 PM   #1
Household Handyman
 
Join Date: Feb 2009
Location: Albany, Ga.
Posts: 2,258
Share |
Default

How to fry a microwave oven:


So I've had this 5550 watt generator for a few years now, used it a few times in my business. Then I go and by another travel trailer. So, I decide to see if the generator would support the TT being as I may want to go somewhere with no hook-ups. The generator came with a 25 ft. cord which plugs into the four-blade, twist-lock receptacle labeled "120v/30amp--220v/50amp". The cord has a normal looking 110v receptacle such as a home duplex receptacle and is clearly labeled "110 volts AC". I tried to run the TT from the regular outlet labeled "110 volt" on the generator, but it will not support the A/C unit in the TT. So I turn off everything in the TT, so I thought, fire up the generator and plug up the TT's power cord. As soon as I walk into the TT I smell smoke and see it coming from the microwave and a small table fan. Rush to unplug the power cord, but too late. The microwave and table fan are fried. Thankfully I did turn the TT's fridge off. Then I start checking out everything. The power cord is clearly labeled "110 volt" on the female receptacle end, and "110v/220v" on the large male four-blade twist-lock male plug. But when I take the male plug apart it is wired wrong. Black and white are to the terminals which would give it 220 volts with the ground correct, no fourth wire. So what I had was two hot wires giving 220 volts, a ground, and no neutral. All is correctly wired now, the TT works fine with the generator and I'm looking for a new microwave for the TT. Lesson learned, but wanted to warn others who may have an extension cord that came with their generator: Check to assure the cord is wired correctly for your use.

Thurman is offline   Reply With Quote
The Following 4 Users Say Thank You to Thurman For This Useful Post:
Code05 (10-09-2011), frenchelectrican (10-09-2011), oh'mike (10-09-2011), SD515 (10-09-2011)
Old 10-09-2011, 12:45 PM   #2
Member
 
Join Date: Nov 2007
Location: Nashua, NH, USA
Posts: 6,926
Default

How to fry a microwave oven:


Was it intentionally feeding 240 volts into hot and neutral for 120 volt circuits, or was it a loose neutral problem (no neutral) allowing the voltages to seesaw on both sides of the line?

__________________
Stop wasting time re-adjusting the pattern. Have several lawn sprinklers, one for each pattern.
AllanJ is online now   Reply With Quote
Old 10-09-2011, 05:48 PM   #3
Household Handyman
 
Join Date: Feb 2009
Location: Albany, Ga.
Posts: 2,258
Default

How to fry a microwave oven:


Ironically the cord that came with the generator did not have a "molded" male plug on one end. It was one of the "DIY" type plugs you buy at a big box store and put on yourself, that should have been a warning. The generator has two (2) duplex receptacles labeled "110v/20amps", and one large four-blade twist-lock type receptacle labeled "120v/30amp and 220v/50amp". The four-blade twist-lock male plug was wired with the black to one "HOT" leg, the white to one "HOT" leg, no wire at the neutral leg, and the green to the ground. This led 220 volts to the other end of the cord which has a standard 110v female cap, looks the same as one part of a duplex receptacle. Therefore there was 220 volts at the female end with no neutral. The cord itself is 10/3 cord. There is no provision for wiring this up as 220v with two (2) "HOTS", a neutral, and a ground. I'm thinking now that someone had rigged this cord after it left the factory. The photos I saw on the internet of this unit, with cord, show a molded male cap on one end and plainly state that it is a "110v/20 or 30 amp" cord. Done is done now, new microwave coming soon. I'm very thankful that nothing else was damaged.
Thurman is offline   Reply With Quote
Old 10-09-2011, 06:21 PM   #4
Semi-Pro Electro-Geek
 
Join Date: Jul 2009
Location: Arizona, USA
Posts: 2,542
Default

How to fry a microwave oven:


Wow. So that's a 3-conductor (including ground) cable, with no red wire? There's no safe/code compliant way to provide both 120 and 240V from that, then. I made a cord like that once, with 240V on a normal 120V female end, because I run a portable welder and plasma cutter that have 120V 15A plug ends but will operate on 240V with greater output. I painted it red and marked warnings all over it!

That mis-wiring is about as bad as the submersible pump I bought that came from the factory with hot and ground reversed.
mpoulton is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Make Room for Over the Oven Microwave gilbo125 Carpentry 17 02-14-2011 11:07 AM
split 220V 3wire between Oven and Microwave Abhi Electrical 2 01-17-2011 08:50 PM
GE Spacemaker® Microwave Oven? kcrossley2 Appliances 0 02-03-2010 01:20 AM
Venting of a microwave oven into attic. BobLink General DIY Discussions 2 09-07-2009 04:20 PM
Above Oven Microwave Oven - Maganatron Burned Out chats72 Electrical 7 12-31-2008 01:19 PM




Top of Page | View New Posts

Copyright © 2003-2014 Escalate Media. All Rights Reserved.