Message-ID: <4E934AC0.8050501@iup.uni-heidelberg.de>
Date: Mon, 10 Oct 2011 21:42:56 +0200
From: =?UTF-8?B?U3RlZmFuIFNjaMOkZmVy?= <Stefan.Schaefer@iup.uni-heidelberg.de>
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To: rsgb_lf_group@blacksheep.org
References: <20111010.114840.1660.0.riese-k3djc@juno.com> <008701cc876a$9d6ab140$0401a8c0@xphd97xgq27nyf>
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Subject: Re: LF: mains wires
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In Germany we all have a 3 phase 400 VAC system in our houses. Usually 
the kitchen oven and/or continuous flow water heaters are connected to a 
3 phase system (the water heater is rated at 3x35 A, i.e. 20 kW). There 
is a 120 deg phase shift between the hot wires (black, black, brown), a 
neutral (blue) and protection earth (green-yellow). So in a symmetric 3 
phase load (like a motor or the water heater) the current in the neutral 
conductor becomes 0. A usual power socket is rated at 16A, i.e. a single 
phase radio amateurs home PA can have up to 3.5 kW :-)
If a 3 phase system is rectified for a PA, there is no voltage-0, so 
smaller caps can be choosen. Also the times between the amplitudes are 
reduces to 20ms/6=3.333 ms.

Voltage levels are 230/400V, 20kV, 110kV, 220kV and 400kV. Some old 
systems at 10kV and 30kV or 6kV for industial motors are still existing...
Rated current of a 400kV system is 3.15 kA.

OT but Interesting differences in the countries.

73, Stefan/DK7FC


Am 10.10.2011 18:35, schrieb mal hamilton:
> Hi Bob
> The normal mains supply to houses and offices is 230 volts ac at 60 amps. 50
> Hz. For large industrial machines in factories they would normally have a 3
> phase 440volt AC/50 Hz supply.
> Some private properties do have a 3 phase supply if required for small
> garage industries or hobbies like lathes etc
> The normal houshold 230v appliance cord/lead is BROWN LIVE, BLUE NEUTRAL and
> GREEN/YELLOW EARTH.
> Some appliances like hoover carpet cleaners, plastic encased have 2 wires ie
> BROWN LIVE, BLUE NEUTRAL and no earth.
> The plug to the mains socket is clearly marked when you make a cord/lead
> connection so the wires do not get crossed over and the plug is non
> reversible.
> The 3 pin plug contains a fuse always in/to the live pin.
>   It is a straight forward safe procedure avoiding crossed Live and Neutral
> wires.
> In EU the supply is normally 220 v but might vary in different countries.
> De mal/g3kev
>
>
> ----- Original Message -----
> From:<riese-k3djc@juno.com>
> To:<rsgb_lf_group@blacksheep.org>
> Sent: Monday, October 10, 2011 3:15 PM
> Subject: Re: LF: mains wires
>
>
>    
>> in the US we have a standard of 120/240
>> with the 120 as the appliance voltage
>> the British and others use 220 for a standard
>> does that mean that 440 is used for the big power draws
>> we would place our clothes dryers on 220 do you have 440
>> in general use in the home
>>
>> Bob K3DJC
>>
>> On Sun, 09 Oct 2011 22:44:20 -0400 Elton A Sanders<radiodog77@pobox.com>
>> writes:
>>      
>>> If it was plugged into US 230v both Black and White would be hot.
>>> Mains
>>> feed here is 2 hots and Neutral hot to Neutral 115v hot to hot 230v
>>>
>>> (feed is from a center tapped transformer on the pole).
>>>        WB5MMB
>>>
>>>
>>> On Mon, 10 Oct 2011 01:25:02 -0000, mal hamilton wrote:
>>>        
>>>> Bob
>>>> If you look at a Dentron 2500 amplifier on the cct diagram the
>>>>          
>>> 230v
>>>        
>>>> mains cable, WHITE wire goes to the ON/OFF switch on amplifier
>>>>          
>>> then
>>>        
>>>> primary of HT transformer which to me is HOT and BLACK wire goes
>>>> directly to the other side of primary winding, NEUTRAL and GREEN
>>>>          
>>> to
>>>        
>>>> chassis.
>>>> In the UK the switch is always in the LIVE (hot) wire and NEUTRAL
>>>> direct to the appliance except it happens to be a double switch.
>>>>
>>>> UK appliance BROWN live, BLUE neutral, plus an earth wire (3 wire
>>>> appliance)
>>>> mal/g3kev
>>>>
>>>>          
>>>>> ----- Original Message -----
>>>>>
>>>>> Sunday, October 09, 2011 7:48 PM
>>>>> Re: LF: mains wires
>>>>>
>>>>> what I use to keep track
>>>>>
>>>>> Black is hot white is not
>>>>>
>>>>> Bob K3DJC
>>>>>
>>>>> On Sun, 9 Oct 2011 17:09:09 -0000 "mal hamilton" writes:
>>>>>
>>>>>            
>>>>>> LF
>>>>>> I have a USA amplifier with 230v input. The mains wires are
>>>>>> BLACK, WHITE, and GREEN
>>>>>>
>>>>>> The cct diagram shows White as the live wire with amplifier
>>>>>>              
>>> mains
>>>        
>>>>>> switch in this line, Black goes to the other end directly to
>>>>>> transformer primary
>>>>>> and Green to earth.
>>>>>> but
>>>>>> according to USA info the Black wire should be Live and White
>>>>>> Neutral.
>>>>>>
>>>>>> So beware !!!!!!!!!!!!!!
>>>>>> de g3kev
>>>>>>              
>>>>> ____________________________________________________________
>>>>>            
>>>
>>>
>>>
>>>        
>> ____________________________________________________________
>> 57-Year-Old Mom Looks 25
>> Mom Reveals $5 Wrinkle Trick That Has Angered Doctors!
>> http://thirdpartyoffers.juno.com/TGL3141/4e931414668c54808em03vuc
>>
>>      
>