I'm looking for an NEC interpretation of the word "dedicated". Although the word appears in the text in a number of instances, there is no formal NEC definition of the word.
I am involved in the design of an building that requires connections to multiple elevators in a common hoistway, with a common elevator machine room. Therefore, I was researching Article 620 of NEC 2008. 620.22 (A) refers to branch circuit(s) required for car lights, receptacles, etc., & reads that "A separate branch circuit shall supply the car lights, ..." 620.22(B) refers to air conditioning & heating source branch circuits, but it reads "A dedicated branch circuit shall supply the air conditioning ..."
My presumption is, that although a separate branch circuit is required for the car lights, receptacles, etc., the line side of a number of fused disconnect switches could be fed from a single branch circuit, out of a remote panelboard, then each of the elevator cars could be served with their own separate branch circuit, from each of the separate disconnect switches.
However, for the air conditioning and heating source circuit, the word "dedicated" is confusing, because there doesn't appear to be a formal interpretation, or definition for "dedicated" in the NEC. In the case of paragraph 620.22 (B) does the word "dedicated" prohibit one from supplying a number of fused disconnect switches from a single branch circuit in a remote panelboard? Understanding full well, that each elevator car air conditioning & heating load must be served from a separate fused disconnect switch, the question is - "does the word dedicated require a dedicated branch circuit from a remote panelboard to serve each elevator car air conditioning/heating disconnect switch, or can a single branch circuit from a remote panelboard serve a number of individual disconnect switches used for elevator car air conditioning/heating loads?"
I am involved in the design of an building that requires connections to multiple elevators in a common hoistway, with a common elevator machine room. Therefore, I was researching Article 620 of NEC 2008. 620.22 (A) refers to branch circuit(s) required for car lights, receptacles, etc., & reads that "A separate branch circuit shall supply the car lights, ..." 620.22(B) refers to air conditioning & heating source branch circuits, but it reads "A dedicated branch circuit shall supply the air conditioning ..."
My presumption is, that although a separate branch circuit is required for the car lights, receptacles, etc., the line side of a number of fused disconnect switches could be fed from a single branch circuit, out of a remote panelboard, then each of the elevator cars could be served with their own separate branch circuit, from each of the separate disconnect switches.
However, for the air conditioning and heating source circuit, the word "dedicated" is confusing, because there doesn't appear to be a formal interpretation, or definition for "dedicated" in the NEC. In the case of paragraph 620.22 (B) does the word "dedicated" prohibit one from supplying a number of fused disconnect switches from a single branch circuit in a remote panelboard? Understanding full well, that each elevator car air conditioning & heating load must be served from a separate fused disconnect switch, the question is - "does the word dedicated require a dedicated branch circuit from a remote panelboard to serve each elevator car air conditioning/heating disconnect switch, or can a single branch circuit from a remote panelboard serve a number of individual disconnect switches used for elevator car air conditioning/heating loads?"
