Page 14 of 27 MCM-Inst-1.10
3.5 Line Voltage Connections
N
LINE VOLTAGE
CONNECTIONS
VIOLET
GREEN
WHITE
BLACK
SLA
TE
GROUND
TERMINALS
GB1
TB4
L1
L2
L3
CB1
Figure 6: Circuit Breaker
N
LINE VOLTAGE
CONNECTIONS
VIOLET
GREEN
WHITE
BLACK
SLA
TE
GROUND
TERMINALS
GB1
TB4
L1
L2
L3
TB1
TB2
TB3
Figure 7: No Protection
N
LINE VOLTAGE
CONNECTIONS
VIOLET
GREEN
WHITE
BLACK
SLA
TE
GROUND
TERMINALS
GB1
TB4
L1
L2
L3
FH
1
FU1
FU2
FU
3
Figure 8: Fuse Block
3.5.1 Circuit Protection
The MCM is considered “permanently connected equipment” and requires a disconnecting means
(circuit breaker or disconnect switch) and overcurrent protection (fuse or circuit breaker). Most models
include a three-phase circuit breaker that functions as both a disconnect and overcurrent protection.
The MCM draws less than 0.2 amps.
Note that the circuit breaker is only rated for operation from -25°C to +55°C (-13°F to 131°F).
●
If you purchase a model with a three-phase fuse block, you will need to provide an external
disconnect.
●
Models with no protection will need an external disconnect and overcurrent protection.
○
Any external disconnect or circuit breaker must be clearly marked, suitably located, and easily
reached.
○
Use circuit breakers or fuses rated for 20 amps or less and rated for the service voltage.
○
Use ganged circuit breakers when monitoring more than one line voltage.
○
The circuit breakers or fuses must protect all hot line voltages:
L1
,
L2
, and
L3
. Neutral does
not need overcurrent protection.
○
The circuit protection/disconnect system must meet IEC 60947-1 and IEC 60947-3, as well as
all national and local electrical codes.
3.5.2 Line Wiring
●
Always turn off the power
before connecting the line voltages.
●
For the line voltage wires, CCS recommends 18 to 12 AWG stranded wire, type THHN, MTW, or
THWN, 600 V.
