65-2640RK-04 M2A Transmitter Operator’s Manual
17
CAUTION:
If shielded cable is used, leave the cable shield’s drain wire disconnected and insulated at the
detector junction box. You will connect the opposite end of the cable’s drain wire to the M2A
junction box’s chassis (earth) ground.
Figure 7: Wiring the Detector to the M2A
14. Reinstall the detector terminal strip into its socket.
15. If shielded cable is used between the detector junction box and the M2A junction box, connect the cable’s
drain wire to an available chassis (earth) ground at the M2A junction box. Do not connect the shield drain
wire at the detector junction box.
Detec tor
Term inal
Strip
C
NC
NO
AL
A
R
M
1
C
NC
NO
AL
A
R
M
2
C
NC
NO
FA
IL
Cable
Shield
Blac k
Green
W hite
Red
Blac k
M2A
J-B ox
Install c onduit s eal
within 1 8 inches
Red
Detec tor J -B ox
Com bustible G as
Detec tor
W hite
Green
Install c onduit s eal within
2 inc hes (for G roup B
env ironments) o r 18
inches ( for G roups C and
D env ironm ents)
Calibration A dapter /S plash G uard
-
S
+
A
B
C
R
S
485
PW
R
/S
I
G
R
W
G
B
LE
L
