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05038.R4 12/10

Page 3

422ELC

PACKAGE INFORMATION

UNPROTECTED SIDE

PROTECTED SIDE

2

1

GND

3

4

2

1

GND

3

4

Earth Ground

Earth Ground

Note: Both ground terminals are common. Use second ground wire

to reduce impedance on long runs to earth ground connections.

INSTALLATION INSTRuCTIONS & DIAGRAM

There are five (5) terminals on the LINE SIDE and five (5) terminals on the EQUIPMENT SIDE of the 422ELC, 4 data lines and one ground. Both grounds are connected

together internally. A single low impedance ground is sufficient. Incoming data lines are cut or disconnected from the equipment to insert the 422ELC product. The

incoming lines are to be connected to the line side terminals as the equipment side lines are connected to the equipment side terminals. The location of the product

should be as close to the equipment as possible. The 422ELC series is designed with a short circuit failure mode to give maximum protection. A fuse, fusible link, or

circuit breaker is recommended for each data/signal line on the input side for those that require an open circuit failure mode.

Caution: A low DC resistance ground may not be a good ground. Lightning contains a broad spectrum of frequencies up to 1 MHz. A low impedance path to ground

at the transient frequencies is necessary. A ground strap is recommended or a #6 AWG stranded wire. For wire lengths over 1.5 meters, there may be some excessive

line to earth potential under severe thunderstorm conditions.