If you follow Handy Hint #1, you can use the power pack that is supplied with the race set. If not, you will need to buy a transformer from you local electronics store. The voltage on the Scalextric Power Bases is 16 volts DC. On my track, I use a separate 12 volt DC power source  to power all of my lights and accessories. This way there is no drain on the main power source to the cars. For this, I used a transformer out of an old computer and plugged in my whole track accessory system as if it were a disk drive!! It is an excellent power source and would probably also drive the cars but I don’t think it would have quite the same zip as the 16 volts DC.

In order to provide steady power to all parts of the track, you can divide each lane into four approximately equal sections and run the wires from the power source and the hand controller stations to each section. All electrical connections are done under the table. At each section, you drill a pilot hole through the table top, half an inch from the slot. Then, insert a jig saw into the hole and cut through the table top, at right angles to the slot, starting at the hole, going across the slot, for about an inch. This allows you to feed the security tape through the table, loop it back and stick itself to the underside of the table.

You can connect the electrical wires to the aluminum tape (under the table) by soldering an "eye" to the wire and attaching a small screw directly through tape and the eye. You cannot solder directly to the aluminum tape as it uses a plastic backing which will melt. Fill the pilot hole with Plastic Wood, sand and touch up with paint. Voila, a simple method of wiring each lane.
 

The driver stations should be located at opposite sides of the table (not to separate combatants but to facilitate self marshaling). It is best to use a standard jack and plug combination so that you can use different controllers (each driver has their favourite). DO NOT USE standard household three prong plugs and sockets as small children may be tempted to plug into a wall socket and this would be VERY DANGEROUS.