Power Wiring - ETC SMARTRACK User Manual

Smartrack User Manual
b) If required, fit the bottom cable entry cover plates provided to the base of the
bottom Smartrack, using the taptite screws provided. These plates should be
used if forming or glanding is required, or, unworked, to blank unused cable
entry ports.
c) Hook the bottom Smartrack in each stack onto the four fixing screw heads
already in the wall, locating the four 'keyholes' in the rear panel to the
screws in the wall. Partially tighten screws.
d) Fit the upper Smartrack(s) in the stack to the wall fixing screws in the same
way, then, using the M5 screws provided, fix the racks in the stack together
by screwing into the threaded holes in the upper rack(s), through the match-
ing clearance holes in the rack(s) below.
e) Tighten all wall fixing screws.
f) Fit the four plastic plugs provided into the four holes in the top surface of the
top Smartrack in each stack.
g) If required, fit the top cable entry cover plates to the top surface of the top
Smartrack, using the taptite screws provided. These plates should be used if
forming or glanding is required, or, unworked, to blank unused cable entry
ports.

4.5. Power wiring

Smartrack is primarily intended for use on five wire services, where the phase to
neutral voltage is 230Vac ± 12.5%. However, single phase and delta wiring is
also possible, and the various alternatives are dealt with below.
The current draw of any dimmer rack is hard to predict, and is always subject to
major variances. A reasonable way of assessing the current requirement per
phase is:
Total connected load (watts) x Diversity factor (0.5 – 0.8)
Estimating the diversity factor is a matter of judgement, and depends very much
on the type of installation and its working practices. It may also be that the instal-
lation as a whole may have a diversity of 0.5, while individual racks may expect
0.8 or even higher.
page 14
(voltage x 3)
ETC Ltd