Here is the 12,000 volt 33 KVA transformer all put together and ready for operation. The 2 chokes are each connected to one side of the 2 Jacobs ladders. They are connected to the high voltage terminals to capture high frequency and high back voltage that tries to back tract to the power transformer. When operating the Jacobs ladders are spaced 1" at their bases and 8" at their tops. The battery cable is ground its connected to the other side of the Jacob ladders, transformer case, building and a separate ground. To give you an idea of the back voltages power the 12,000 volt transformer has trouble jumping a 3/8" gap on the Jacobs ladders, When the Tesla coil is running the Jacobs ladders will arc over about once every minute of operation at a 1" gap spacing, This means we are looking at about 32,000 volts coming back at the transformer, If it were not drained off it would soon build high enough to damage the 12,000 volt transformer.