[GreenKeys] 2 1/2A SCREW IN FUSE

[Bob kb8tq]

Hi

The transformers are still pretty easy to find if you look for “buck boost transformer”.

Bob

> On Aug 12, 2017, at 9:53 PM, Bruce Gentry <ka2ivy at verizon.net> wrote:
> 
> Power voltages in the USA have risen over the past 50-60 years. In the first half of the twentieth century, 110/220 volts was standard for residential and small business DC, so AC was the same so light bulbs and universal motors could be used on either.  With the widespread installation of and conversion to three phase in the 1950s, 120/208 volts four wire became the standard in medium and large buildings. Later appliances and bulbs were rated for 120 so they could be used in apartment buildings, and single phase service was raised so motors would not be run undervoltage and the bulbs would be bright. Unfortunately, many window air conditioners rated for 240 were plugged into 208, and the compressor motors overheated to early destruction unless an auto transformer to raise it to 240 was used. The transformers were once very easy to find at junk stores when  208 volt air conditioners became  available.  I measured about 232 give or take a little in England and Israel within the past few years.
> 
>      Bruce Gentry
> 
> On 8/12/17 6:57 PM, Dave Horsfall wrote:
>> On Sat, 12 Aug 2017, Bruce Gentry wrote:
>> 
>>> If the synchronous motors are designed for 110 or 115 volts at 60 cycles, the common 120-125 seen today in many places can certainly cause over current and overheating.
>> 
>> That's interesting; I've always assumed that USA was 110-115v; is it now actually 120-125v, or nominally so?
>> 
>> Trivia: Australia is officially 230v in line with Europe, yet I still regularly measure 240v or so (which is within tolerance). And at one time, Western Australia was 250v, until they joined the national grid...
>> 
> 
> ______________________________________________________________
> GreenKeys mailing list
> Home: http://mailman.qth.net/mailman/listinfo/greenkeys
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:GreenKeys at mailman.qth.net
> 
> 2002-to-present greenkeys archive: http://mailman.qth.net/pipermail/greenkeys/
> 1998-to-2001 greenkeys archive: http://mailman.qth.net/archive/greenkeys/greenkeys.html
> Randy Guttery's 2001-to-2009 GreenKeys Search Tool: http://comcents.com/tty/greenkeyssearch.html
> 
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html