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Re: Coil Grounding


I had a similar problem a couple of years ago.  There are a couple of
excellent grounds already in your house:

1.  If you do not have plastic (PCV, PBT, etc), the drain pipe is a
wonderful ground.

2.  If you have any 3 prong outlets, the third prong (e.g. safety ground)
is the same excellent ground as the drain pipe.  In many homes/apartments,
the screw that holds the face plate onto your outlet is grounded.  Before
using the safety ground as a ground, test the voltage between the safety
ground (third prong) and the prong on the right (hot).  It should be
110-120 volts.  By the same logic, the voltage between any grounded
appliance/object/terminal and the prong on the right should be 110-120
volts (e.g. between exposed metal on your refrigerator (remember paint is
an insulator) and the prong on the right).  You'll find that in the US a
substantial number of the outlets are miswired.

3.  Many appliances with exposed metal are required to be grounded;
refrigerators, electric ranges, washing machines, etc.

On Sat, 12 Feb 2000, Tesla List wrote:

> Original Poster: "Troy Peterson" <highvoltage-at-mad.scientist-dot-com> 
> 
> Hi all, 
>  
> I am rather new to coiling, having built a small (30cm) coil, and a solid
> state coil  (the dial 3055 type) I am now moving on to a larger coil, but I
> have a problem... 
>  
> I am in a small rented Duplex - my coiling work is done in the basement.
> How do I ground my coil? any suggestions? I can't run a heavy wire outside
> from in here, and I can't pound a ground rod through the cement floor. I am
> currently running my small coil on a water pipe, this may not be such a
> good idea, but it is a low power coil and it doesnt seem to be a problem. I
> have done a few calculations and located (but not purchased) the parts I
> need for the coil. My calculations are as follows, if you see any errors,
> or have any  suggestions plz send me a message back.
>  
>   Primary xformer: E=10KV 
>                            A=23ma
>           
>                E
>                --- = Z = 434.78k ohms
>                 I 
>  
>   Tank Capacitor:
>                                1
>                        C = -------- = 0.006202 uF
>                              2piFZ
>  
>   Primary Coil:  Inverse conical
>  
>       (I havn't done these calcs yet, I'm planning to wait till I have the
> ACTUAL specs on the secondary)
>  
>   Secondary:
>                    Coil length: 61cm (24 inches)
>                    Coil Diameter: 20.3cm (8 inches)
>                Wire: 22 gauge
>                   ohms/ft: 16.2
>                   wire dia: 0.0285 inches
>                   turns/inch: 37
>                   feet/pound: 514.2
>                   req'd length of wire: 1858.88 ft
>            turns: 888
>    
>  
>  Anyway, that's what I am planning, any comments, math errors, etc? Also, I
> plan to use beer-bottle capacitors because of parts availability where I
> live (small town - capacitors: hard to find, beer bottles: very easy ;)
> could someone help me to approximatly calculate the number of bottles I
> would need (and surface area of foil, etc) to achieve somewhere near the
> above noted value?
>  
> Thank-you to anyone that can help,
>  
> Troy Peterson [VE7SOK]
> highvoltage-at-mad.scientist-dot-com
> or 
> troypete-at-sunwave-dot-com
>  
>  
>                
> 
>