NEC Univerge SV8100 System Hardware Manual page 508

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When the Front Cover is mounted to the

wall, the Front Cover may be warped due

to an over-tightened screw. Simply loosen

The Wall Cover Set supports only

embedded wiring. Exposed wiring (Open

wiring) is not recommended.

When installing an optional Wall Cover

Set, ground the Doorphone using an

earth line from the earth connection

point on the Rear Bracket to an electric

service ground (less than 100 ohms).

Otherwise, electric shock may occur.

Installing SV8100 Optional Equipment

UNIVERGE SV8100