WAC Lighting retains the right to modify the design of our products at any time as part of the company's continuous improvement program. MAy 31, 2016 10:13 AM
waclighting.com
Phone (800) 526.2588
Fax (800) 526.2585
Headquarters/Eastern Distribution Center
44 Harbor Park Drive
Port Washington, NY 11050
Central Distribution Center
1600 Distribution Ct
Lithia Springs, GA 30122
Western Distribution Center
1750 Archibald Avenue
Ontario, CA 91760
4
LOW VOLTAGE CABLE LENGTH
In planning a low voltage system, it is necessary to consider the impact of voltage drop. Because of cable’s inherent resistance, voltage drops
along its length: the end-of-run lamps will be dimmer than those at the beginning. Since voltage drop is a function of cable length and cable
size and total fixture wattage, voltage drop can be minimized in several different ways:
•
Use multiple cable runs
•
Use heavier gauge cable(8 or 10 gauge)
•
Shorten cable lengths or runs
•
Reduce VA of individual fixtures
•
Reduce the total number of fixtures on a run
•
Use multiple transformers in different locations
Cable is measured by gauge. The lower the number, the thicker the cable and the more current it carries. Common cable size for low voltage
lighting is available in three gauges: #12-2, #10-2, and #8-2. To calculate maximum cable length, use the formula below:
V
d
=
V
d
= Voltage drop in the section of cable, in volts
L = Length of the section of the cable (one way distance), in feet
VA = Total VA values carried by the section of cable for the fixtures it supplies
K
c
= Cable Constant as follow:
Please refer to WAC Lighting website for voltage drop calculator.
CABLE CONNECTION DETAIL
1. Open the cover of the transformer and remove the Knockouts at
the bottom of the transformer as necessary.
2. Run lighting cables through Knockouts from the bottom of the
transformer.
3. Connect the low voltage cables to the COMs and low voltage
taps labeled on the Terminal Blocks. Make sure that all Cable
Connecting Screws are secure and tight.
L×VA×2
K
c
Cable Size
K
c
12
10
8
7500
11920
18960
Do Not Exceed 0.625 Amps on primary
use looped wire to test
primary amps under full load
15V
14V
13V
12V
COM
PLUG PHOTOCELL
HERE
(CREMOVE JUMPER)
PHOTOCELL PLUG
TIMER MODULE
RECEPTACLE
OFF
ON
Terminal Blocks
Cable Connecting Screw
Knockouts
INSTALLATION INSTRUCTION
Magnetic Transformer
9075-TRN-SS / 9150-TRN-SS / 9300-TRN-SS
