It is best to install a new circuit dedicated only to the disposal unit unless you have a major kitchen renovation going on. If walls are being opened up, you can come out of an existing counter socket outlet. Remember that there will also have to be a suitable switch installed into the cable going to the unit to control its operation. <><><>
As always, if you are in doubt about what to do, the best advice anyone should give you is to call a licensed electrician to advise what work is needed.
Before you do any work yourself,
on electrical circuits, equipment or appliances,
always use a test meter to ensure the circuit is, in fact, de-energized
IF YOU ARE NOT ALREADY SURE YOU CAN DO THIS JOB
SAFELY AND COMPETENTLY
REFER THIS WORK TO QUALIFIED PROFESSIONALS.
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