Hi Jim,
I still don't get it (maybe because I am dumb). At my service entrance is
a protector that connects has two MOVs, one from each leg to ground. Ground
in this case is the same as neutral At the water pump is also a protector
that has MOVs frm the two legs (the pump is a 240 V pump) and ground. In the
shack I have a protector that connects MOVs from neutral AND the hot 120 V
leg to ground. It also incorporate a protecting circuits for my phone, it
has two gas discharge tubes between the line and ground.
Should I disconnect al MOVs that are connected to ground ??? As I wrote to
you earlier, my house has had two registered lightning hits (and possible a
couple of more we don't know about) and everything survived.
Can anyone describe the failure mode that makes the MOV from the hot leg to
ground bad?
Hans - N2JFS
In a message dated 3/19/2010 1:33:50 P.M. Eastern Daylight Time,
jim@audiosystemsgroup.com writes:
Hi Dick,
I don't know "the Soft-Start kit" or it's application, so I can't comment
beyond
what I've said here. But MANY products are designed with serious
engineering
mistakes. The "pin 1 problem" is a glaring and very common example -- it
causes
hum, buzz, and RFI. Putting an MOV between line and safety ground is
another one
-- it can blow up equipment! The only safe place for an MOV (or other
shunt-mode
protector) in the power system is at the main service entrance where power
comes
into the building from the street. This is the so-called "whole house"
protector,
and it's a very good idea if done well.
73,
Jim K9YC
On Fri, 19 Mar 2010 17:22:37 +0000, RICHARD SOLOMON wrote:
>Are you saying we should not use the ones that come with the Soft-Start
kit ??
>73, Dick, W1KSZ
>> From: jim@audiosystemsgroup.com
>> To: towertalk@contesting.com
>> Date: Mon, 15 Mar 2010 22:50:45 -0700
>> Subject: Re: [TowerTalk] Shack wiring
>>
>> On Mon, 15 Mar 2010 21:34:10 -0400, hanslg@aol.com wrote:
>>
>> >A good surge protector has three MOVs, one from each leg and one
between
>> >the legs.
>>
>> WRONG! An MOV from Phase (hot) to Ground (Green Wire) is more likely to
BLOW
>> UP equipment than protect it. To understand this, see my earlier post
on
>> this.
>>
>> 73,
>>
>> Jim K9YC
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|