[BC] 110 V DC

[PeterH5322]

>My question is:  Was there anyplace in the U.S. that was served with 110 DC
>power?  If so I never heard of it.  If there wasn't then why were so many
>radios made with AC/DC power supplies?

The post-WW-II average over all U.S. electric utilities was 117 volts, 
which is why there were 117 volt vacuum tube filaments, and why many 
small appliances were specified for 117 volts.

However, the line voltages increased thereafter, and before the recent 
energy crisis, real or orchestrated by politics, the average was much 
higher.

My utility, one of the largest in the country, had an average voltage of 
127.5, this which was for a nominal 120 volt system.

120, 240 and 480 are the U.S. standards.

115, 230 and 460 were earlier standards.

And, 110, 220 and 440 before that.

During the energy crisis, my utility experimented with lowering the line 
voltage, initially all the way down to 110 volts.

But, there were too many electric motor burnouts, and other failures, so 
115, and finally 117.5 was selected.

We're still a 120, 240 and 480. nominal, country, however.