AT&T System 75 Wiring Diagram page 78

LEFT SIDE
Figure 2-26. 346A1 Power Panel Circuit Breaker Locations
A 5-foot line cord provides ac power to the 346A1 power panel. Service
to the ac receptacle must be provided by a dedicated (nonswitched)
20-ampere circuit. A maximum of four power panels can be connected
to a 20-ampere circuit.
Note: Electrical codes of Chicago and Cook County, Illinois
require the use of a metallic 346B1 power panel equipped with a
fused ac power cord (POP-6/217 by JDS Product).
Each 346A power unit contains four power jacks. A slide switch is
located between the top and bottom jacks. When the slide switch is in
the down position, 10 watts of power is available at both jacks. When
the slide switch is in the up position, 20 watts of power is available at the
jack above the switch. The jack below the switch has no power.
Note: If two consoles are connected to a power supply, and an
addition is made that requires a 20 watt source, remove the
second console and move the power supply switch to the 20 watt
position. Connect the second console to another power supply.
Table 2-E lists adjunct powering limitations for each 346A power unit.
346A1 POWER PANEL
CIRCUIT BREAKER "L" FOR
LEFT–MOUNTED 346A POWER
UNIT
CIRCUIT BREAKER "C" FOR
CENTER–MOUNTED 346A
POWER UNIT
CIRCUIT BREAKER "R" FOR
RIGHT–MOUNTED 346A
POWER UNIT
Adjunct Power Units
2-51