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Re: [TCML] Control Cabinet, X-ray cable, RF-Mains grounding



You may wish to enclose the PT in a separate cabinet with the RF filters for
the PT.

Putting a 14 kV xmfr into a control console case is dangerous, and also a
violation of NEMA standards,
which could affect insurance policies on your home, garage, shop, etc.

Worst case, you get electrocuted by the 14.4 kV xmfr, then the insurance
company investigates, and denies
you life insurance.  Or, your shop burns down and they deny insurance on a
policy technicality.

Something to think about.

Dr. Resonance





On Tue, Dec 16, 2008 at 5:59 PM, Jim Mora <wavetuner@xxxxxxxxx> wrote:

> Hi List,
>
>
>
> I am in the process of assembling a 28" high 19" rack control cabinet. The
> PSU is a very nice GE PT 240/14400V 5KVA of the round epoxy type all
> isolated controlled by a saturable reactor capable of current > 30 amps
> which both sit on the floor of the rack and a 1256D variac for voltage
> control which takes an 8u panel in the front 1.75" * 8 =14". The top panel
> will have the metering, key sw, sat adjustment, pilot and HV indicators. I
> am using a NEMA #3 AB contactor mounted on the inside wall and a 60 amp
> fused disconnect mounted along side the 1256D variac knob on the outside of
> the 8u panel.
>
>
>
> X-ray cable revisited yet again. I have 60 feet of quality and terminated
> X-ray cable. I would like to mount standard federal twist jacks on the
> cabinet ground to make the cable which would be cut in half easily
> removable. A 17KV line surge suppressor would be suspended from the
> filament
> connections across the jack connectors and connected across the PT with 12"
> of .5" silicon 50KV wire. The lower and upper deck will be separated by
> .25"
> Lexan self.
>
>
>
> I know that the spark gap ends need to be stripped back to the PE for 12 to
> 18". I am on the fence how to best and safely make this connection. Dr.
> Resonance suggests grounding one side of the PT and using his RL filter and
> thusly one HV feed. The perceived downside of this is that RF and mains
> grounds are tied together albeit through the air core and resistor bank. If
> I ground anything beyond the jacket and mains ground, I would consider
> connecting the inner turn of the primary and the base of the secondary to
> RF
> ground only. I am concerned about RF kick backs that are not absorbed by
> the
> 17KV Joslyn Gap at the PT. I don't think streamers will hit the cables but
> as an added precaution, I could run that area through some Schedule 40 PVC.
> The cabinet will have a very solid mains ground. I will surely put a horn
> gap on the Maxwell .1uf / 50KV cap at the coil base.
>
>
>
> The spark gap will be an 11" ASRG in series with a fully adjustable
> Tungsten
> series gap to ease the rotary energy dissipation. Has everyone abandoned
> the
> 2" ferrite toroid 15-20 turn RF filters? This will be a 12" coil with a
> ~60x12" toroid.
>
>
>
> I really am struggling deciding how to run power to the coil for the safest
> operator controls (namely me) and the rack case ground. I used to keep my
> pig nearer the coil; but I am wanting a self contained solution here.
>
>
>
> Thanks,
>
> Jim Mora
>
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> http://www.pupman.com/mailman/listinfo/tesla
>
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