cadpoint
IMO, A designer or engineer is showing a junction because they are usually showing or implying; 1) a usuage of circuit(s),or 2) a transition in the usage of a circuit.
What do you mean a "usage of circuit"? Your always using circuits...
What I meant and didn?t explain or expand on earlier, is that the take off (OP-picture) even noted with different colors that this light (EM) is different from another light, this designation has a different circuit. If one studies the drawing the lights are labeled in two different ways. One is clear and one is slashed and half filled with EM, beside it!
It has been accounted for but what does it mean to the estimator or the installer. There has to be one of three things that are going on.(six if One reads past "Any") So it comes down to what the type of structure that it?s to be installed in/on. What do the specifications say about running LPS & EM circuits? Are these EM lights always on?
Any institutional work, I?ve even done, that has a LPS or EM lights that might or might not be on a generator have always be specified to be run independent of other circuits!
Others have mentioned that it depends on the light that is specified. The Code does allow the light itself to be a wire way if the light is listed as such. Just install the light and run two circuits. Thus a junction box might be created.
Respectful of the light itself, an example is; what is in the interior of these EM lights is there anything that makes it different? Maybe nothing at all! Maybe it could have a battery backup. Or it could solely be operational only on a generator.
BTW, I never saw a ?J? in a circle or a ?J? in a box? in your picture?
My belief is that there will be two circuits for this string of lights.