[Elecraft] OT: RF Choke question

[Jim Brown]

On 7/2/2020 9:54 AM, Terry Brown wrote:
> 1.	Is rapping 10 turns of the electrical wires of each circuit around
> the toroid enough?

Use the recommendations in  http://k9yc.com/2018Cookbook.pdf as a 
starting point, and study k9yc.com/RFI-Ham.pdf to understand concepts.
> 
>   
> 
> 2.	The electrical wires are individually connected to the control
> panel.  In the case of the 120V, there is a white, black, and ground.  In
> the case of the 240, there is 3 reds, a black and a ground.  Do I have to
> wrap the ground wires of these circuits around the toroid as I do the other
> electrical wires?

ALL conductors must be wound around the ferrite. Chokes must be right at 
the noise source (the elevator motor's variable speed control 
electronics), NOT near the panel. Choke both the AC line side and the 
wiring between the motor's controller and the motor.

Also, make sure that the green wire between the AC line and the motor is 
the only ground for the elevator.

If possible, make all wiring associated with the elevator twisted 
triplet (for 120V or pure 240V) and twisted 4-conductor for combined 
120/240V wiring.

73, Jim K9YC