Installation, Operation and Maintenance Manual
IO-70103 RevE 08-17
10
INSTALLATION INSTRUCTIONS
The ASCO SERIES 500 Surge Protective Devices (SPDs) are high quality, high energy surge current
diversion systems designed to protect sensitive equipment from damaging transient voltage surges.
Proper installation is required for maximum system performance.
The installer should perform the following steps to assure a quality installation. The entire installation
manual should be read before starting installation. These instructions do not replace national or local
electrical codes. Check applicable electrical codes to ensure compliance. Installation of the SPD system
should only be performed by qualified personnel.
1. Insure that all power is removed before beginning installation. A qualified licensed electrician shall
install all electrical connections.
2. The standard SPD is provided in a 520- NEMA 12 (Indoor), 515- NEMA 1 (indoor), 510- NEMA 4X rated
enclosures. Verify the SPD enclosure rating by referencing position 14 in the model number.
3. Determine where the SPD is to be mounted, allowing for minimum length of wire between itself and
the input power terminals of the service panel. Punch or cut the proper hole size in the side of the
SPD closest to the knockout to be utilized in the service panel (plastic NEMA 4X “J” enclosure
units include a flexible conduit/nipple accessory – no punching or drilling required in SPD). Drill
mounting holes in wall at location picked for SPD next to service panel using mounting dimensions
shown in the table below. Mount surge suppressor to wall using appropriate size & type hardware.
4. Connect black wires (line or phase) marked L1/A, L2/B or L3/C, the white wire (neutral) marked N,
and the green wire (ground) marked G, of the SPD using the wire range listed below. To yield the best
performance of the SPD within the electrical distribution system, keep all conductors as short as
possible and avoid sharp bends.
5. Connection to the unit’s summary alarm contacts shall be with #18 – 22 AWG. The ratings of the Form
‘C’ contacts are 5 amps at 250 VAC maximum with a power factor of 1.0. For additional information,
see “Monitoring” section.
6. Apply power. The surge protector is fully operational when the GREEN LEDs on the modules and
the front door of enclosure are illuminated. If the GREEN LEDs are extinguished or a RED LED is
illuminated, check to ensure that power is applied to the SPD. If an abnormal indication is present,
remove power to the SPD and contact ASCO Surge Protection at: 1-800-237-4567 or 1-727-535-6339.
7. Periodically monitor the status of the LEDs. Reduced protection exists if the GREEN LEDs are
extinguished or the RED LED is illuminated. Please contact ASCO Surge Protection at: 1-800-237-
4567 or 1-727-535-6339.
8. The protection modules in these SPDs may be replaceable, contact ASCO Surge Protection for
replacement.
NOTICE - If the SPD model is configured to include a neutral connection (“Y”, “H”, “S”, “N”), and a Neutral
connection is not available, please contact factory.
