SECTION
LOW VOLTAGE LIGHTING TRANSFORMERS&POWER SUPPLIES
ACME ELECTRIC
•
MILWAUKEE, WI
•
800.334.5214
•
acmetransformer.com
86
/ I
I
VOLTAGE DROP FORMULA
Total Watts on Cable
X
Length of Run
Cable Size Constant
=
Voltage Drop
GROUP VI
Low Voltage Lighting Wiring Diagrams
X1
H1
X2
120V
12V
H2
X1
H1
X2
120V
24V
H2
X1
H1
X2
240V
12V
H2
X1
H1
X2
240V
24V
H2
X1 X2 X3 X4
120V
INPUT
H4
H1
H3
H2
12V
OUTPUT
X1 X2 X3 X4
240V
INPUT
12V
OUTPUT
H1 H2
H3 H4
X1 X2 X3 X4
120V
INPUT
H4
H1
H3
H2
24V
OUTPUT
X1 X2 X3 X4
240V
INPUT
24V
OUTPUT
H1 H2
H3 H4
GROUP V
VOLTAGE DROP CHART
Voltage
Life Expectancy
% of Rated
at Lamp
of Lamp
Candlepower
13.2
2/3 Rated Life
350
12.6
3/4 Rated Life
180
12.0
As Rated
100
11.5
2X Rated Life
80
11.0
3X Rated Life
74
10.5
5X Rated Life
65
10.0
9X Rated Life
50
CABLE SIZE CONSTANT CHART
Cable
Cable Size
Size
Constant
#18
1380
#16
2200
#14
3500
#12
7500
#10
11,920
#8
18,960
#6
30,150
