[Sneap] RG58C/U max dc voltage?

[James Kaiser]

Hjalmar,

When I'm looking for guidance on this I usually turn to the Glassman 
power supply catalog and see what cables they use for the output of 
their power supplies. I find that they use RG58 up to 6kv on some 
supplies. Curiously, they only seem to use RG59 up to 5kv even though it 
has more dielectric. Perhaps it has to do with the smaller diameter of 
the inner conductor. Once the voltage exceeds 6kv Glassman switches to 
RG8, a much bigger cable.

In short, 8kv seems like a stretch for RG58. If you have a choice, I 
think I'd recommend you use RG8/U. RG8/U also has a lot less capacitance 
per foot, allowing the switches to dissipate less power.

Jim Kaiser

James W. Kaiser
University of Notre Dame
Physics Department
225 Nieuwland Science Center
Notre Dame, IN 46556
(574)631-6808



Hjalmar Bruhns wrote:
> The host for the 2008 SNEAP annual meeting is the University of Michigan at Ann Arbor.  The meeting dates are: October: 10 - 16, 2008.
> The meeting web link is:
> http://www-ners.engin.umich.edu/research/Mibl/Sneap/2008.htm
>
>
> Dear SNEAPers,
>
> Does anyone know how much DC voltage a RG58C/U cable is spec'd to handle?
>
> SHV-10 connectors like the Kings 1065-1  
> http://www.kingselectronics.com/HighVoltage/connectors/tabid/52/laproduct/351/default.aspx  
> are rated to 10kV "for use with RG58C/U cable". But the bit of info I find  
> on RG58C/U concerning voltage is "Max. Voltage 1900 Volt" - although that  
> probably applies to RF applications, not DC.
>
> We intend to switch our ~8kV on and off with up to 5kHz using HV switches  
> that have ~100ns switching times.
>
> Can we trust RG58C/U to handle that?
>
> Thanks,
>
> Hjalmar
>
>   
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