[OpenTRV-dev] OT: Voltage drops

[Mike Stirling]

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 
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>
>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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