APC PMH3XS-B ユーザーズマニュアル

Follow the steps listed below when making wiring connections.

1. Turn off all power supplying this equipment before working on or inside 

any enclosure containing this equipment.

2. Confirm the SPD voltage rating and configuration is the same as the 

system voltage and power system configuration to which it will be 
connected.

3. Identify proper location for surge protective device. Locate as close as 

possible to the panel being addressed so the wires are as short as 
possible. Mount unit securely.

4. Install in accordance with National Electrical Code

®

 (NEC

®

) and local 

electrical codes for overcurrent protection recommendations and wire 
ampacity considerations.

5. Twist conductors 1/2 turn or more for every 12 inches of length. Do not 

loop or coil wires. Be sure to maintain adequate wire bending space per 
NEC.

6. If the remote signaling contacts of the diagnostic display panel are to be 

used, refer to the section, “Dry Contacts”, on page 18 for wiring 
instructions.

7. On a high-leg delta installation, note the high leg connection per wiring 

diagram. See Figure 5.

8. Replace all devices, doors, and covers, including the line barrier for the 

optional integral disconnect, before turning on power to the equipment. If 
the SPD is properly installed and functioning, the green LED indicators 
on the display will be lit.

If you have any questions pertaining to the installation of this device, contact the 
APC Technical Support at 1-800-800-4272.

• Apply appropriate personal protective equipment (PPE) and follow safe 

electrical work practices. See NFPA 70E.

• This equipment must only be installed and serviced by qualified 

electrical personnel.

• Turn off

 

all power supplying this equipment before working on or inside 

equipment.

• Always use a properly rated voltage sensing device to confirm power is off.

• Replace all devices, doors and covers before turning on power to this 

equipment.

• This equipment must be effectively grounded per all applicable codes. 

Use an equipment-grounding conductor to connect this equipment to 
the power system ground.

Confirm the SPD voltage rating on the module or nameplate label is the 
same as the operating voltage.

NOTE: The surge protective device must be 
installed in an accessible location as described 
in the NEC

®

.

NOTE: The neutral connection is not present on 
3-wire, 3-phase wye ground or 2-wire single-
phase mid-point ground power systems. For 
these systems, bond the neutral and ground 
lugs together in the SPD. For installing wiring 
see Figures 3

 

through

NOTE: See “Terminals, Wire Size, and 
Installation Torque” section for the acceptable 
wire size and installation torque on page 10.

NOTE: Always install the SPD on the LOAD 
side of the main Overcurrent Protection Device 
(OCPD).