[Amps] MOVs

[Vic K2VCO]

Interesting. When I lived there the pins were flat with two of them angled. Apparently the 
standard changed to round pins some years ago; new sockets accept both types. But what I 
am interested in is the relationship of the 240v lines to ground. They are usually labeled 
"L" and "N" (live and neutral?) and I wonder if the N is grounded somewhere.

I want to be able to protect the equipment against both common mode and differential mode 
surges. I think a MOV across the hot pins would only work for differential mode.

On 1/9/2013 7:59 AM, Steve Katz wrote:
>
> Vic,
>
> The residential electrical socket standard in Israel is the SI 32 Type H to standard IS 
> 16A-R. It is 240V + ground and neither of the 240V pins are connected to ground.
>
> I ship stuff to Israel all the time (including power supplies) and they just use their 
> own power cords with the Type H plug (three round pins) or use an adapter like this one:
>
> WA-14 Travel Plug Adapter for Israel, Palestine ("Type H" SI 32, Round Pins)
>
> 73,
>
> Steve WB2WIK
>
> -----Original Message-----
> From: Amps [mailto:amps-bounces at contesting.com] On Behalf Of Vic K2VCO
> Sent: Monday, January 07, 2013 9:51 AM
> To: Amps reflector
> Subject: [Amps] MOVs
>
> I have a power supply that needs to work here in the US and in Israel, where power is 
> supplied as one phase of 240V plus a safety ground. I am not sure if one of the 240V 
> lines is grounded as well. The power supply doesn't require 120V for anything, so 
> there's no neutral.
>
> What is the correct way and ratings for MOVs to protect against line transients?
>
> Here in the US I would use a 130V MOV from each hot wire to ground. But clearly that 
> wouldn't work in a place where one side of the 240V line is grounded.
>
> I suspect (but am not 100% sure) that the standards in Israel are similar if not the 
> same as in the UK.
>
> --
>
> Vic, K2VCO
>
> Fresno CA
>
> http://www.qsl.net/k2vco/
>
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-- 
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco/