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Determining the Load
To determine the transformer size, add up the lamp wattages
1.
also consider the power loss in the output wire too
2. For example, if you have 10 fixtures all rated at 25 watts, you
will need a 300 watt (VA) transformer (10 x 25 = 250 watts).
3. Do not exceed maximum wattage capacity. If your total wattage
is too high, either divide the load between two transformers,
or use a higher power rated transformer.
4. The transformer has resettable switch-type circuit breakers.
The circuit breakers will trip if there is a short circuit, or if
the total lamp wattage exceeds the rated 300 watts per circuit.
5. To reset breaker, push the toggle to the "on" position.
If breaker trips again, check for an overload or short circuit.
6. Measure the approx. distance from the transformer to the first
fixture on each circuit. Refer to chart to select the correct output
for each circuit. You may use either a single tap or all taps.
POWER UNIT VOLTAGE DROP WIRING CHART
Tap 1
12v
wattage
AWG
AWG
12
10
100-149
38
60
150-199
25
40
200-249
19
30
250-300
N/A
24
WATTAGE LOSSES PER FOOT
AWG
100w
150w
12
0.21
0.461
10
0.131
0.293
Low Voltage Power
75W 150W 300W 600W 900W
Tap 2
13v
AWG
AWG
AWG
12
10
12
76
120
113
50
80
76
38
60
57
N/A
48
N/A
200w
300w
0.855
N/A
0.537
1.2
Installation Guide
.
Tap 3
Tap 4
14v
15v
AWG
AWG
AWG
10
12
10
180
151
240
120
101
160
90
76
120
72
N/A
96
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