[time-nuts] AC Connector On HP 5061B

[Brooke Clarke]

Hi Mike:

The reason for the center tapped transformer on the pole pig is to protect the 
house occupants from a primary to secondary short in the pole pig transformer. 
  That would put 4KV into your house.

It's not clear to me how 230 VAC countries handle that problem?  If they also 
use the same transformer but only bring in the 230 VAC then neither side of the 
line is near ground potential.

Have Fun,

Brooke Clarke
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Mike Naruta AA8K wrote:
> Basically, we get ours from a 230 Volt,
> center-tapped transformer secondary.
> The center tap is also earthed.  We can
> connect 115 Volt appliances between either
> end of the transformer and center-tap "neutral".
> Higher-current appliances connect to both
> ends to get the full 230 Volts.
> 
> The neutral is bonded to the earth connection
> at the mains panel.
> 
> Ground Fault Interrupters (GFI) monitor
> the current flow in the "hot" and neutral
> conductors.  Any imbalance indicates a
> current flow on the earth conductor and
> the GFI disconnects the circuit to remove
> a shock hazard.
> 
> 
> Interesting things happen when the neutral
> conductor between the mains panel and the
> utility transformer secondary has high
> resistance.  Instead of the voltage being
> the same on both "hot" leads, the voltage
> is divided proportionately to the load
> resistance.  One "hot" lead can be at,
> say, 30 Volts, while the other "hot" lead
> is at 200 Volts.  This can be exciting.
> 
> 
> Mike - AA8K
> 
> 
> 
> David C. Partridge wrote:
>> That critically depends what country you are in.
>>
>> In the UK you can normally safely connect yourself between neutral and
>> earth, as neutral is "always" bonded to earth at the sub-station.   There
>> may be a few volts on neutral due to phase imbalance in the three phase
>> supply and how far you are from the sub-station, but normally that's not a
>> problem.   I really wouldn't like to connect myself between live (nominal
>> 230V over here) and neutral though!
>>
>> I don't know the wiring rules in US well enough to determine how "safe" this
>> would "over there".
>>
>> Dave
>>
> 
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