There's "correct" and there's "works." Try it on the existing circuit, if you trip shit, then get a new circuit. Lots of the NEC is best practices put into code because when circuits start tripping, people do dangerous and stupid shit like forcing breakers open.

It's illegal to do your own electrical work in Philly anyway because homeowners cannot pull plumbing or electrical permits without a plumbing or electrical license, but that doesn't stop most people.