[Amps] Looking for picture of SB220 interlock switch

[Carl]

Adding a roll cage into your Prius might also save your life.

However many of us come from the concept of personal responsibility, a bit 
of training, and the ability to read a warning label.

Those that dont/cant are removed from the gene pool which may be a good 
thing.

Carl
KM1H


----- Original Message ----- 
From: "Joe Subich, W4TV" <lists at subich.com>
To: <amps at contesting.com>
Sent: Wednesday, November 06, 2013 11:20 PM
Subject: Re: [Amps] Looking for picture of SB220 interlock switch


>
> > That "safety" device can easily destroy your PS and I always
> > disable/remove them and add a warning label.
>
> While it may destroy your power supply it can save your life.  The
> best solution is to *add* the primary interlock switches and leave
> the crowbar in place.  Disconnecting the primary before or at the
> same time as shorting the HV will protect the power supply -
> particularly if a properly sized glitch resistor has been installed
> in the HV lead between the HV terminal and the crowbar/cold end of
> the plate choke.
>
> Every one of the "big transmitters" I ever worked on had *both*
> primary interlocks *and* mechanical crowbars in addition to the
> "deadman stick" to be used before reaching into any place where
> high voltage could exist.  Some of those power supplies were capable
> of as much as 20 KV at 10A - they were nothing to take lightly.
>
> I would never disable a safety circuit - that is quick route to an
> early appearance in "Silent Keys."
>
> 73,
>
>    ... Joe, W4TV
>
>
> On 11/6/2013 11:00 AM, Carl wrote:
>> That "safety" device can easily destroy your PS and I always
>> disable/remove them and add a warning label.
>>
>> If you are that worried about safety then add a cover switch to disable
>> the AC line as many other amps do.  Very simple and inexpensive.
>>
>> Carl
>> KM1H
>>
>>
>> ----- Original Message ----- From: "Geert Jan de Groot" 
>> <pe1hzg at xs4all.nl>
>> To: <amps at contesting.com>
>> Sent: Wednesday, November 06, 2013 4:07 AM
>> Subject: [Amps] Looking for picture of SB220 interlock switch
>>
>>
>>>
>>> I'm preparing to start on an SB220 renovation project:
>>> replace capacitors, update diode board, etc
>>>
>>> The previous owner has disbled the safely interlock by
>>> bending the brass strip away and removing the
>>> "tapped phenolic spacer". I'd like to restore them.
>>>
>>> I'm not sure what, and why, the machanical and electrical
>>> parameters are of the spacer as I'll need to find something else.
>>> I'd expected it to be a metal thing but according to the manual
>>> it isn't.
>>>
>>> Does someone have a detailed picture of the interlock in place?
>>> Why is it an isolator? What are the mechanical stresses on the spacer?
>>>
>>> 73,
>>>
>>> Geert Jan
>>>
>>> PS: I know the interlock doesn't make it safe, but 'safer'
>>> and that's still a good thing IMHO
>>>
>>>
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