Unless you are under the 2008 NEC this is NOT a code requirement.I recommend you stay away from a multiwire circuit because it is wired on a double pole circuit breaker and if one side causes a short and trips, the other non affected circuit will trip and thus leaves you in the dark.
First off, there is NO such thing as a SPDT breaker. There are single, double and three pole breakers.To my knowlege you may not wire two arc fault circuits on a 3-wire cable. Sure there are 2-pull afci but you may not have two circuits on a single pull double throw breaker that land in different places.
He DOES NOT need 14/4. And 15a AFCIs cost the same as 20a AFCIs.Please wire your room with 2 wire romex or if you need two circuits 14-4 will suit you, or 12ga but 20 amp arc faults cost a bit more.
A 240v load does NOT even require AFCI protection.A 2pull arc fault would be for a 240volt load,I.E. a heater or something. Good luck!
All power in a bedroom must be on a arc-fault breaker,
"...far less.." "...$75...." I don't think so."To my knowledge," means just that. I guess you got me on a technicality, although if I were pulling in two new circuits and they were arc fault circuits, they would not be on a 14-3. The cost of two wires and two breakers is still far less than a two pole arc fault. The money you save by using 14-3 on the average home run might be around $15 for a 70-80 ft. run. The increase from 2 single pole breakers to 1 two pole breaker could be as much as $75 depending on brand and store. I'm all about getting the job done correctly and as inexpensively as possible.
Hoarea, I sure hope you found the answer you were looking for somewhere in here, and maybe a good laugh or two. Good Luck...
To answer the original question, there is NO limit to the number of receptacles on a circuit in a residence.
We just use common sense and take into account the intended use when figuring circuits.
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