400 Series
420 & 425 Surge Protective Devices
Installation, Operation and Maintenance Manual
Installation, Operation and Maintenance Manual |
IO-70104 Rev 1, 1/2014 |
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EMERSON NETWORK POWER SURGE PROTECTIVE DEVICE |
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INSTALLATION, OPERATION AND MAINTENANCE MANUAL |
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TABLE OF CONTENTS |
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INSTALLATION |
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Environment.................................................................................................................... |
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Mounting............................................................................................................................ |
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Wire Sizing/Routing......................................................................................................... |
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Conduit Connection ........................................................................................................ |
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WiringConnections.......................................................................................................................... |
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ApplyingPower................................................................................................................................. |
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PRODUCT RATINGS AND LIMITATIONS |
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Voltage Protection Ratings .............................................................................................. |
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Circuit Ampacity Limitations............................................................................................ |
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TROUBLESHOOTING/SERVICING/MAINTENANCE |
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Troubleshooting .............................................................................................................. |
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MODEL NUMBER CONFIGURATION |
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Model Number Configuration.......................................................................................... |
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Configuration & Voltage (Chart) ...................................................................................... |
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SPD WIRING and MOUNTING |
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Circuit Breaker and Wire Size .......................................................................................... |
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Parallel Wiring Diagram................................................................................................... |
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Screw Mounting .............................................................................................................. |
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DIN Rail Mounting Kit ...................................................................................................... |
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Dimensional Information................................................................................................. |
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Installation, Operation and Maintenance Manual |
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IO-70104 Rev 2, 6/2014 |
The Emerson Network Power 420 & 425 Surge Protective Devices are high quality, high energy surge current diversion system designed to protect sensitive equipment from damaging transient voltage surges resulting from load switching, lightning strikes and other sources.
The installer should perform the following steps to assure a quality installation. Please read all instructions before starting the installation of this product. These instructions do not replace national or local electrical codes — check applicable codes to ensure compliance.
INSTALLATION
DANGER! ONLY QUALIFIED PERSONNEL SHOULD INSTALL OR SERVICE 
THIS SYSTEM. ELECTRICAL SAFETY PRE-CAUTIONS MUST BE FOLLOWED 
WHEN INSTALLING OR SERVICING THIS EQUIPMENT. TO PREVENT RISK OF ELECTRICAL SHOCK, TURN OFF AND LOCK OUT ALL POWER SOURCES TO THE UNIT BEFORE MAKING
ELECTRICAL CONNECTIONS OR SERVICING.
DANGER! SEULEMENT LE PERSONNEL QUALIFIÉ DOIT INSTALLER OU MAINTENIR CE SYSTÈME. DES PRÉCAUTIONS DE SÉCURITÉ EN ÉLECTRICITÉ DOIVENT ÊTRE SUIVIS LORS DE L'INSTALLATION OU DE LA MAINTENANCE DE CET EQUIPEMENT. POUR EVITER TOUT RISQUE DE CHOC ÉLECTRIQUE, DÉBRANCHEZ ET VEROUILLER TOUTES LES SOURCES D’ ALIMENTATION DE CET EQUIPEMENT AVANT DE LE BRANCHER OU LE MAINTENIR.
Environment — The unit is designed for operation indoors in ambient temperatures of - 40ºC (-40ºF) to +85ºC (+185ºF) with a relative humidity of 0% to 95% (non-condensing). The unit is provided in an industrial enclosure, which should not be installed in areas with excessive dust, corrosive vapors, flammable materials or explosive atmospheres.
Mounting — Mount unit as close as possible to the service panel in close proximity to the breaker that will feed the SPD., Remove plastic cover on unit to gain access to the four mounting holes in case. Use #6 x 3/4” self-threading screws (provided), to mount the SPD to wall or metal back plane. Replace cover on unit and torque cover screws to 10 IN-LBS, (see drawing). For best performance, unit should be positioned so that the length of the wiring to the surge protective device (SPD) unit is minimized.
Wire Sizing/Routing — #12 AWG wiring is provided with unit. To reduce the wiring impedance to surge currents, the phase, neutral (if required), and ground conductors are recommended to be twisted together and routed in the same raceway (conduit). Avoid any sharp bends in the conductors. All wiring must comply with the National Electrical Code (NEC) and applicable local codes.
Conduit Connection — The SPD wires should feed through the plastic conduit piece supplied. The conduit should be cut to match the distance from the unit to electrical panel. Use the supplied conduit hub to connect to the electrical panel.
Wiring Connections — Before making connections to the unit, verify that the unit model number and nameplate voltage rating are appropriate for connection to the intended power source (See table).
1.It is recommended that a 20A circuit breaker be used for installation and connection to the service panel.
2.Connect the white wire (if provided) of the SPD to the neutral of the supply, and connect the green wire (if provided) of the SPD to source ground.
3.Connect each Black Phase Wire to corresponding phase on the service panel.
4.If not using the relay contact wires for remote sensing, cut and dress the wires. If using remote sensing, these wires are connected to COM (orange), NC (blue), and NO (yellow) respectively. (Relay’s maximum switching capacity is 250VAC, 5A.)
(continued)
Installation, Operation and Maintenance Manual |
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IO-70104 Rev 2, 6/2014 |
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