What junction box should I use for Step Lights?

2” x 4” boxes to have minimum inside dimensions of 3”H x 2”W x 2”D in order to accommodate fixtures.
Note: Actual depth of box to be determined in accordance with the NEC and local ordinances. Indoor or outdoor frame mounted junction box:

Raco 2” x4” (16.5 cu. In) or equivalent recommended.

Related Links: 

Step Lights Catalog