Emtech Electronics IA-204S - Manual (Page 6)

6
POWER SUPPLY
NOTE - This information is applicable only to the power supplies available from Emtech Electronics. If you
choose to use a different power supply, please follow the manufacturers instructions.
Location
•
A central location is most desirable for the power supply.
•
Keep the distances between each IA-204 and the power supply as short as possible.
•
The following wire gauges are recommended, depending upon the distance from the power supply to the IA-
204:
Gauge Distance
18 AWG 0 to 50 feet
16 AWG 50 to 200 feet
14 AWG 200 to 300 feet
Longer distances are not recommended.
Mounting
•
The DC power supplies, available from Emtech Electronics (PS-30, PS-60, PS-90 & PS-100), can be
mounted into a Hoffman A-SE 10 X 10 X 4 or equivalent (10” x 10” x 4”) electrical box. If another type or
style of box is chosen, make sure that it is approved by local building codes.
• Securely mount the supply in the Hoffman A-SE 10 X 10 X 4, and mount this box at the desired location in
accordance to local building codes.
• If the RCM-42B is to be mounted at the power supply location, it can be mounted in the same box as the
power supply.
• The Emtech power supplies are conservatively rated and under normal use will not become excessively hot.
Note: The DC power supplies (PS-30, PS-60, PS-90 & PS-100) provided by Emtech are manufactured by
Tamura Corporation, and they are all UL/CSA/VDE listed supplies. Do not use any uncertified power supplies
in your in-wall installations.
Wiring
•
Follow local building codes when connecting the power supply to the AC power mains.
•
The recommended Emtech power supplies can be wired for three possible primary input voltages; low,
normal, and high. They are factory set for normal. See the directions included with the power supply for
more details.
• If your IA-204 installation uses electrical conduit in between each amplifier, make sure that the negative (-)
DC output lead from the power supply is electrically connected to the conduit. Also, make sure that each IA-
204 has a good electrical connection (ground) to that conduit. The four screws that connect the IA-204 to the
4 gang box should not be depended upon to make a reliable ground connection. Proper grounding will
minimize the possibility of hum problems, ground loops, and oscillation within the system.
•
All connections between the power supply and the electrical mains should be made by a licensed electrician
and should meet with all local building codes.
•
If a 70 volt distributed system is installed, metal conduit may be required in some places. Consult local
building codes for details.