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ETC ArcSystem Navis 100 - Prepare the Ceiling; Spacing for Wall Wash Luminaires

ETC ArcSystem Navis 100
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10 Navis 100 Installation Guide
Prepare the Ceiling
Cut a hole 120 mm (4-3/4 in) in diameter in the ceiling to accommodate
the luminaire's mounting clamps.
Note:
Navis 100 luminaire mounting clamps can accommodate
0.520mm (1/323/4in) ceiling thickness.
Ensure that there is sufficient cable extending down through the ceiling
opening so that the luminaire can be inspected and serviced when
needed. ETC recommends at least 50 cm (20 in) of cable.
Spacing for Wall Wash Luminaires
If you are installing luminaires with a wall wash trim plate, ETC
recommends that you allow minimum spacing as follows to obtain the
best coverage:
61cm (2ft) between the wall and the center of a luminaire
91cm (3ft) center-to-center of adjacent luminaires