[Amps] HV Interconnects RF Decks to PS

[Carl]

I might use new test prod 10KV rated wire for a B- lead but never for HV. 
IMO its not even as safe as using RG-59 with the shield removed.

In the various rack mounted amps and modulator decks here all HV is with 
thick 30 or 40KV wire. This also includes the January 1954 QST Single 
Control 813 transmitter with a remote PS. It is never routed so that it 
could touch the floor or otherwise get damaged....simple common sense.

Carl
KM1H



----- Original Message ----- 
From: "Patrick Barthelow" <apolloeme at live.com>
To: <amps at contesting.com>
Sent: Sunday, September 12, 2010 6:11 AM
Subject: [Amps] HV Interconnects RF Decks to PS


>
> Very good productive discussions on the topic.
>
> I am a firm proponent of a shielded HV cable for safety, and accompanied 
> by the design considerations being discussed.
> What I have seen out there, in the Home brew amp world  as a rule, rather 
> than an exception,  is often a single unshielded HV wire connecting the PS 
> box to  the RF deck, sometimes even automotive store aftermarket HT 
> Ignition wire.   Not comfortable with that at all.
> Other times with the hyper flexible rubber, perhaps silicon rubber HV test 
> prod wire perhaps only 3-4mm OD.  That scares me, and I would love to see 
> a real world test of test prod wire that has been impacted, pinched, run 
> over by castor wheels of 100 lb PSs. and that sort of thing.   I have seen 
> wire that is pinched hard under wheels, or other heavy equipment, and 
> sometimes have seen a nearly undetectible split to the core wire inside, a 
> complete violation of the insulation from the outer surface to the hard, 
> stranded wire inside, that could easily be missed on a visual inspection.
> If you took a test sample 3 mm HV  test prod wire and say, hit it semi 
> lighly with a hammer against a  concrete floor base,  you would do 
> compression  damage the insulation to some degree depending on the hit, 
> and it might not be all that visible.  That test may simulate a hard 
> rollover by a narrow castor wheel of a Heavy PS.    It would be 
> enlightening to injure such wires  to varying degrees and then carefully 
> HI POT test the wire in the direct vicinity of the "injury" so see if say, 
> a 10 KV rating was highly compromised.
>
> Best Regards,
> 73, de Pat Barthelow AA6EG  apolloeme at live.com
> http://www.cq-vhf.com/vhf_highlights/2010_vhf/2010_summer_vhf/2010_summer_vhf_echoes_barthelow.pdf
>
>
>      MOONBOUNCE                                 YURI'S NIGHT
>
>
>
>
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