NAPCO GEMC-NAC7L Installation Instructions Manual Download Page 17

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Gemini C-Series GEMC-NAC Extender Installation Instructions 17

5. ROUTING THE GEMC-120VACH HARNESS FROM THE GANG BOX INTO THE CONTROL PANEL EN-

CLOSURE & POWER SUPPLY BOARD

At this point, both the control panel and electrical gang box are mounted, and the electrical gang box contains 3 wires

that provide a continuously-powered (un-switched) 120VAC source from a maximum 15A dedicated branch circuit and a
grounding conductor. The electrical gang box must be located no closer than 6 inches and no further than 12 inches from
the left side of the control panel housing.

IMPORTANT:

Turn off the 120VAC branch circuit breaker before proceeding.

GEMC-120VACH Harness

The GEMC-120VACH harness must run from the electrical gang box to the control panel enclosure inside either plas-

tic or metal rigid conduit.  Mount this conduit between the electrical gang box
and the control panel enclosure using fasteners appropriate for the installation.
Note that one end of the GEMC-120VACH harness contains three protruding
wires (green, white and black); the other end contains a ring connector con-
nected to the green (ground) wire.

Route the GEMC-120VACH into the conduit

such that the end of the harness with the ring connector is located within the
enclosure, and the other end (with the protruding wires) remain inside the elec-
trical gang box. The portion of the harness between the enclosure wall and Left Side Plate (HW1491) is protected by the
harness tubing to ensure separation between power limited wires connected to the panel and the and non-power limited
120VAC wires of the harness.

Inside the electrical gang box are the three branch circuit 120VAC wires: hot (black), neutral (white) and earth ground

(green or bare copper). As with the previous electrical connections, all of the following electrical connections must be per-
formed by a licensed electrician in accordance with all national and local electrical codes.

Connect Earth Ground

Inside the gang box, connect the branch circuit ground wire to the

GEMC-120VACH harness protruding green ground wire using a suitable
connector (such as a wire nut). Place the harness green ground ring con-
nector (located inside the control panel enclosure) on the enclosure ground
stud as shown in the illustration at right (this "branch circuit ground"

must

always be first on and last off the enclosure ground stud

). Secure the ring

connector to the stud with the 6-32 nut with star washer (tighten securely).
Note that the ground stud is long enough for a second ring connector and
nut, as described in the next step.

Locate the power supply ground wire (a short 14 AWG green pigtail

splice wire with a ring connector). Place this ground pigtail ring connector
on the same enclosure ground stud used in the previous step, and secure this
ring connector to the stud with another 6-32 nut with star washer (tighten securely). Lift the plastic terminal block cover
and connect the other end of the pigtail to the center terminal (marked with a ground symbol) of the GEMC-PS24V7A
power supply board.

Connect Hot and Neutral Wires

Inside the electrical gang box, connect the branch circuit white neutral and black hot wires to the white and black

wires of the GEMC-120VACH harness using suitable connectors
(such as wire nuts).

At the other end of the GEMC-120VACH harness (located inside

the control panel enclosure), connect each wire to the terminal block
of the power supply board as follows: White neutral wire to "N" right
terminal, black hot wire to "L" left terminal. Tighten all terminal screws
securely and press the terminal block cover back in place.

Enclosure Door Ground

The enclosure cover must also be connected to ground. On the

inside of the enclosure is a pre-installed ground cable. Connect this
ground cable to the earth ground stud located inside the enclosure on top of the other ground wires previously installed.

GEMC-120VACH

WHITE

BLACK

GRE

GREEN

BLA

WHITE

GROUND STUD LOCATION (ARROW)

(PO