XPost: sci.electronics.basics   
   From: noone@nospam.com   
      
   On 11/1/2017 10:45 μμ, Phil Hobbs wrote:   
   > On 01/11/2017 12:33 PM, Tzortzakakis Dimitrios wrote:   
   >> On 7/1/2017 9:53 μμ, John Larkin wrote:   
   >>> On Sat, 07 Jan 2017 09:54:52 +0100, Helmut Wabnig >> -.dotat> wrote:   
   >>>   
   >>>> On Fri, 6 Jan 2017 03:53:30 -0500, Phil Hobbs   
   >>>>  wrote:   
   >>>>   
   >>>>> On 01/06/2017 01:19 PM, Tzortzakakis Dimitrios wrote:   
   >>>>>> On 31/12/2016 4:00 ??, Mr. Man-wai Chang wrote:   
   >>>>>>>   
   >>>>>>> Just curious about it.   
   >>>>>>>   
   >>>>>>> Does every country have its own devices to calibrate one volt in   
   >>>>>>> meters?   
   >>>>>>>   
   >>>>>> as one thousandth of a kV. Or a millionth of a MV.Yes, in USA they   
   >>>>>> have   
   >>>>>> 120 volt in houses compared to 230 V to the rest of the world.   
   >>>>>   
   >>>>> It's mostly an eastern/western hemisphere thing, apart from Japan   
   >>>>> (100V)   
   >>>>> and Taiwan (120V).  See   
   >>>>> .   
   >>>>>   
   >>>>> Cheers   
   >>>>>   
   >>>>> Phil Hobbs   
   >>>>   
   >>>> Yes, and the USA have the lowest electrical safety standards   
   >>>> of the world, equal to Pakistan and back street Bangla Desh.   
   >>>>   
   >>>> No RCDs in the American homes.   
   >>>   
   >>> We call them GFDs. My house has them in all outlets near plumbing   
   >>> fixtures or other likely-grounded locations.   
   >>>   
   >>>   
   >>>> You have to wait until the 600A main fuse blows.   
   >>>   
   >>> Fuse? We use circuit breakers. My house is wired 120-0-120 volts, with   
   >>> a dual 125 amp main breaker. Most outlets are 120, and a few, for big   
   >>> loads, are 240. We don't have a/c, which is the big load in most of   
   >>> the US. Our heat and clothes dryer and cooking are gas.   
   >>>   
   >>> Getting hit by 120 volts is not nearly so dramatic as contacting 240.   
   >>> I do most wiring hot.   
   >>>   
   >>>>   
   >>>> How many get killed every year in USA by electricity?   
   >>>   
   >>> A little browsing suggests that there are about 51K electrical fires   
   >>> in the USA per year, with about 500 deaths.   
   >>>   
   >>> The corresponding numbers in GB look like 37K and 250.   
   >>>   
   >>> The population ratio is about 5:1.   
   >>>   
   >>> It's mostly older buildings that have electrical fires. There is some   
   >>> horrendous ancient knob-and-tubing stuff in the attics of old   
   >>> Victorians around here.   
   >>>   
   >>> https://en.wikipedia.org/wiki/Knob-and-tube_wiring   
   >>>   
   >>>   
   >> very intersting!there are some homes here, too, with marble (!)   
   >> distribution panels, that means a sheet of marble, with everything on it   
   >> (splices, knob type, switches, fuses,and so on). The owners of the homes   
   >> are stubborn against modernizing them, as it's a great expense.   
   >   
   > Knob-and-tube is perfectly good as long as nobody futzes with it.   
   > Problem is, old houses tend to collect "informal" electrical and   
   > plumbing work.   
   >   
   > Cheers   
   >   
   > Phil Hobbs   
   >   
   fascinating!of course you have different methods as most houses in USA   
   are built of timber. Here the old system was iron tubes (iron not   
   steel!) on the wall and small boxes, both junction and for plugs etc.   
   also of iron. sometimes I come upon paper insulated cables! there are   
   still many underground cables with paper insulation (both medium and low   
   voltage).   
      
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