“1,920 watts divided by 180 watts (per receptacle) = 10.66 receptacles allowed on circuit.
If using a 15 amp circuit you would use 14/2 w/ground and in calculation substitute the 20amp with 15 amp. “
Would a light switch count as receptacles as well assuming the light switch is connected to the same branch circuit as the outlets? Also, I would imagine that a 3way switch would count as one receptacle too. Besides modern led lights consume a fraction of the previous incandescent light for the same amount of lumens.
No, you do not count a light switch, but what you do count on the circuit is what the total watts are for the bulbs in the light fixture/s being used in the circuit (count the number of bulbs being used and total up their watts per bulb).
By wallspace 2 feet or larger, you mean a wallspace not connected to other wall?
Any wall space of 2 feet or more requires a receptacle.
Yes, even then.
When measuring the distance from one receptacle to the next for the 12 foot rule you go according to linear feet from receptacle to receptacle not direct line from one to the next in the way of a corner wall. Imagine a triangle with only two of the three sides. The two sides are the wall linear measurement, this is the measurement you must use. If you connect the triangle with the third line that is the line of site measurement. That may be less than the linear which will not pass.
The city where I live follow NEC 2011 without exception. Does that mean that one would need AFCI breakers for almost every branch circuit? And all the 20amp breakers that came along with the panel will wasted… Or maybe simply installing an AFCI outlet (usually cheaper than an AFCI breaker) upstream from the other outlets without a necessary afci at the breaker panel itself.
No, you can not use an AFCI receptacle as the first receptacle protecting down line receptacles unless you follow the NEC rules (see below and don't fall asleep reading it). Long story short in order to use an AFCI receptacle you must use MC from the panel to the first receptacle then house the receptacle in a metal box etc; yada yada yada. In the long run it is usually cheaper just to use the AFCI breaker. NOTE: It must be a CAFCI breaker. (C.ombination A.rch F.ault C.ircuit I.nterrupter). A mistake that many people make when reading this is thinking combination means AFCI and GFCI protection. Although there are such breakers what this rule refers to as "combination" is that the AFCI breaker protects both series and parallel arch faults. So yes, the extra breakers included with the purchase of the panel are basically useless except for just a few rooms in the house, like the basement and I think a utility room at this point.
So, two light switches wired as a 3-way switch is required in this case despite the close proximity of the doors/entries?
What I normally use as a rule of thumb which has not failed me yet is if I walk into a room and a light switch is within my arms (both arms stretched out in a line from doorway to doorway) reach then no 3 way switch is needed. Hope you got that.
210.12
AFCI receptacle instead of AFCI breaker can be used if:
(4) A listed outlet branch-circuit type arc-fault circuit interrupter
installed at the first outlet on the branch circuit
in combination with a listed branch-circuit over current
protective device where all of the following conditions
are met:
a. The branch-circuit wiring shall be continuous from the
branch-circuit over current device to the outlet branch circuit
arc-fault circuit interrupter.
b. The maximum length of the branch-circuit wiring from
the branch-circuit over current device to the first outlet
shall not exceed 15.2 m (50 ft) for a 14 AWG conductor
or 21.3 m (70 ft) for a 12 AWG conductor.
c. The first outlet box in the branch circuit shall be marked
to indicate that it is the first outlet of the circuit.
d. The combination of the branch-circuit over current
device and outlet branch-circuit AFCI shall be
identified as meeting the requirements for a system
combination–type AFCI and shall be listed as such.
(5) If RMC, IMC, EMT, Type MC, or steel-armored Type AC
cables meeting the requirements of 250.118, metal wireways,
metal auxiliary gutters, and metal outlet and junction
boxes are installed for the portion of the branch circuit
between the branch-circuit over current device and the first
outlet, it shall be permitted to install a listed outlet branch circuit
type AFCI at the first outlet to provide protection
for the remaining portion of the branch circuit.
(6) Where a listed metal or nonmetallic conduit or tubing or
Type MC cable is encased in not less than 50 mm (2 in.)
of concrete for the portion of the branch circuit between
the branch-circuit over current device and the first outlet,
it shall be permitted to install a listed outlet branch-circuit
type AFCI at the first outlet to provide protection for the
remaining portion of the branch circuit.