12V Length
Wattage
Wire Size (Gauge)
10
12
26’
20’
300W
150W
DC Transformer
12V Length
Wattage
Wire Size (Gauge)
12
25’
50W
AC Transformer
12V Length
Wattage
pr
ima legac
y
tr
ansf
or
mer and v
oltage dr
op inf
or
ma
tion
Magnetic & Toroidal Transformer Information
Electronic Transformer Information
Follo
w all local and na
tional elec
tr
ical c
odes
.
For assistanc
e please call P
rima C
ust
omer S
er
vic
e a
t 562-407-3079
proper usage. Prima low voltage transformers must be used with all Prima Lighting product installations. All warranties are void if Prima transformers are not used.
Prima’s catalogs provide general information and suggestions for proper dimmer usage. Please consult our customer service department with any questions
installation. Adhere to all local and national electrical codes prior to installation.
IMPORTANT: USE ONLYLOWVOLTAGE DIMMERS WITH MAGNETIC &TOROIDAL TRANSFORMERS
Prima recommends the use of 10AWG THHN wire to maintain 25 amp capacity.
(Note: Using a dimmer may shorten the secondary length distance.)
ELECTRONIC TRANSFORMERS ARE DIMMABLE.
Prima recommends the use of 10AWG standard wire on output.
Attach wires Firmly with wire nuts.
Voltage Drop Formula
Wire Size (Gauge)
10
10
12
12
12
5’
8’
10’
15’
30’
300W
200W
150W
100W
50W
AC Transformer
Class II Electronic Transformers
Class I Electronic Transformers
MUST USE LOW VOLTAGE ELECTRONIC DIMMER TO FULFILL PRIMA WARRANTY.
13615 Marquardt Ave. Santa Fe Springs, CA 90670
Ph. 562-407-3079 . Fx. 562-407-3069
www.primalighting.com
Class I
Class II
Wire Size
(Gauge)
Watts (VA) per Circuit
12V
13V
200
300
200
300
12
13’
X
32’
X
10
21’
14’
51’
34’
8
33’
22’
81’
54’
14V
15V
200
300
200
300
12
51’
X
69’
X
10
80’
54’
110’
74’
8
128’
85’
175’
117’
Note: Maximum length on the table listed is in ft. Length is based on min. ideal voltage of 11.3V
when operated without dimmer, and measured between the secondary output to the first fixture / power feed.
Wire Size (Gauge)
Max. Length of Run (ft.)
14
25’
12
39’
10
63’
8
100’
Total Watts on Cable x
2 x Length of Run (ft.)
= Voltage Drop (V)
Cable Size Constant
Cable Size (Awg)
Cable Size Constant
#12
7,500
#14
4,710
#10
11,920
#8
18,960
#8
REV
.033015
