Step 7 - Label Circuits
•
A sheet of labels, with vertical sequentially numbered circuit numbers, P/N 29260, has been supplied to number the
circuits in the circuit directory on the door of the rack if the part number 166-390 or 166-391 sequential control module is
used. A second sheet of labels with circuit numbers in pairs horizontally and then vertically, P/N 29679, has also been
supplied if the part number 166-392 or 166-393 phase - balanced control module is used. It is important to number these
circuits as they also, by association, number the load terminals inside. Usually, the left-most cabinet begins with circuits 1
thru 96, and on from left to right. If your racks have been factory assembled and custom numbered, skip to the next step
(8).
Step 8 - Connect load conductors
•
Follow the instructions here for each dimmer type you are installing. Note that fluorescent loads are only dimmable
when using external power extenders and factory specified fluorescent dimming ballasts.
15/20 AMP INCANDESCENT AND LOW-VOLTAGE LOADS:
Referring to Figure 4, connect the load wire for the first (upper) dimmer to the upper load terminal, and the load wire for
second dimmer to the lower load terminal. Terminate their respective neutral wires to the adjacent neutral terminal
located directly behind the load lug. Tighten according to Table II.
Note: If 15 Amp and 20 Amp,
120V dimmers are intermixed on
the premises they must both be
wired as 20 Amp branch circuits
as the modules are not
separately keyed.
Table II – Load Terminal Torque Ratings
LOAD TERMINALS (rated for 90
˚
C copper wire only at 75
˚
C
ampacity)
14 AWG – 2 AWG 50 in.-lbs.
(2 – 6 mm
2
)
Figure 4 –
Load Terminal Wiring
Terminal
15
/2
0
In
ca
nd
es
cent and
Low-Voltage Load
1A
1B
2A
4B
1
2
3
8
NEUTRAL BUS TERMINAL LOAD TERMINAL
LOW-VOLTAGE APPLICATION NOTES:
When using TOPAZ dimmer modules with transformer loads, the kW rating becomes the kVA rating. VA ratings are
found by multiplying the input voltage (12OV) by the current flowing in the transformer primary (120V side) for all
transformers connected to the dimmer module. When calculating VA load keep in mind that transformer losses add many
VA to the published VA load rating of the transformer. When current cannot be measured, derate the kW rating of the
dimmer module by 25% and add up the kW ratings of the lamps involved.
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