it still doesn't answer his question. All I see is that you have to have a switch at the top and one at the bottom. Whether or not they control the SAME light, or just that each controls A light is left unspecified. For energy savings, etc I can see wanting them to be 3-ways, but the NEC (as far as I know) doesn't care about energy savings........yet.NEC 210.70(A)(2)(c)
Where the stairway between floor levels has six risers or more, a wall switch must be located at each floor level and at each landing level that includes an entryway to control the illumination for the stairway.
Are you talking CEC, or NEC ?I don't think a room requires them but I believe it does require a switch at each entry.
code does not recognize future expansionsometimes the nec can't beat common sense. i don't know about you but try walking through a cluttered room to find a light switch.i know maybe it's not required, but neither is leaving spares for future growth in an attic.this is just the way i was taught. on another note why else would they make them?:vs_bulb::vs_bulb::vs_bulb: