Electrical regs on different phases in adjacent sockets?

Question

just found 2 single phase sockets on different phases which makes it possible to recieve 415 v shock. i know there is a reg pertaining to this, along the lines of all sockets in a location being on the same phase, but i can't find it. please list reg number and edition you are reading from.

Answer 1

Let's see... single phase household = 120V rms, = 170 V peak.  Times two for opposite phase = 240 V rms, or 340 V peak.

In kitchens, it is mandatory to have a split receptacle - so people can power toaster and microwave simultaneously - but the two breakers must be mechanically linked to prevent shock when working on the receptacle.  Both neutrals (if fed using two 14-2 circuits instead of one 14-3) must be tied together at the panel, but the phase for top and bottom of the split receptacle may be off by 180°.

ISBN - 0920312365 "Electrical Code Simplified, Ontario Book 1"

Answer 2

I recall you must label it according to 16th Edition but I don't have 17th edition to see if that has changed any.