[OpenTRV-dev] OT: Voltage drops

[Kevin Wood]

Yes, this is also fair comment. Making this circuit safely relies on an
understanding of *exactly* how it works, as the author goes to some
lengths to point out.

Kevin

> If you don't know the answer to particularly the first of those two
> questions then you shouldn't be tackling a project involving direct
> connection to mains.
>
> Mike
>
> ----------------original message-----------------
> From: "Bo Herrmannsen" EMAIL ADDRESS HIDDEN
> To: "Closed list for developer discussions"
> EMAIL ADDRESS HIDDEN
> Date: Tue, 11 Jun 2013 14:11:05 +0200
> ----------------------------------------------------------
>
>>
>>I'm working a bit again on a circuit that allows safe and "almost" error
>> free
>>messurement on mains voltage (search givmon on openenergy)
>>
>>i have all the bits reasonble placed and observed the 3mm creepage
>> between mounting
>>holes etc...
>>
>>but i need to calc what voltages there are present where to make 100%
>> sure
>>
>>of course i have googled but i cant find an easy to understand answer for
>> these 2 q's:
>>
>>
>>adding 3 2.2Mohm in series to both the neutral and line wires.. what
>> would the drop be?
>>
>>and what would the drop be across a 0.47uF capacitor? the mains are
>> connected via that to
>>a bridge recitifier and need to know what voltages i can expect arround
>> those
>>
>>/bo
>>
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