The purpose of this system is to provide two voltages with only three conductors AND to limit the voltage between any conductor and the earth for safety purposes. ALL THREE CONDUCTORS ARE CURRENT-CARRYING CONDUCTORS! This arrangement, first put into practice by Edison on his Direct Current system of distribution gives the consumer a choice of two voltages. The voltage from any of the three conductors to the earth will be a maximum of 120 volts nominal. A third wire, called the grounded conductor is run from the center tap to the residence.įrom either of the secondary outer connections to the center tapped connection the voltage will be 120 volts nominal. This secondary winding also has a connection mid-way between the ends of the winding called a center tap and this center tap is connected to the earth. In The US and (I think) north America, the nominal voltage delivered to residences is 240 volts from the secondary winding of the utility's distribution transformer. You guys are getting mixed up with multi-voltage three-wire systems and the terms earthed, ground, grounded and most of all, voltage-to-ground.
I don't know them at all, lol, so that is likely as totally wrong as it sounds.**
**Just got a reply from the girl we bought it from and she asked her boyfriend abt the breaker the outlet they hooked it up to was on and he said "double 50 amp". And they are the same as this one we just bought. The best thing abt this one is that my bulbs from the one we blew the ballasts on are still good, the fans and timer are good and all the parts like the cover, trim, acrilyc, etc are in great condition. We didn't pay a lot for this one but I can't afford to buy another one if this doesn't work out. And for whatever reason, tanning bed manufactures don't make the info easy to find like I thought they would have ! Lol. I am now obsessed with making sure it is right before we hook it up. (And I soon learned the ballasts would be about $60-80 each and I would need 8 and that was more than we paid for the bed.) What we didn't know, is that my dad had changed it into a 220 at some point before he passed away 6 months before then. It ran on 110 and we plugged it into the outlet that my mom knew to be 110 and it blew all the ballasts. I probably seem obsessive about it but 2-1/2 years ago my mom and I split the cost of a used tanning bed.
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