Wiring Rules
Original instructions
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Wiring Recommendations
The power supply terminal block can accommodate:
The caged connectors of the terminal blocks are designed for only one wire or one cable end. Two wires to the same connector must be installed with a twin cable end to help prevent loosening.
NOTE: When using stranded cable, Schneider Electric strongly recommends the use of cable end which are fitted with an appropriate tool.
DANGER
LOOSE WIRING CAUSES ELECTRIC SHOCK
Do not insert more than one wire per connector of the terminal block without a twin cable end.
Failure to follow these instructions will result in death or serious injury.
DANGER
FIRE HAZARD
Use only the recommended wire sizes.
Failure to follow these instructions will result in death or serious injury.
Cable size
The following table provides the size for the cables to use with the 5-pin caged terminal block:
Cable type
1 solid conductor
1 stranded cable(1)
1 stranded cable with single cable end .
2 solid conductors, only with twin cable end .
2 solid conductors, only with twin cable end .
AWG
24...12
22...14
22...14
2x24...2x16
2x22...2x16
mm2
0,205…3,310
0,357…2,285(2)
0,324…2,285(2)
2x0,205…2x0,82
2x0,324…2x1,44(2)
AWG
24...12
22...14
22...14
2x24...2x16
2x22...2x16
(1) Minimum individual wire size in stranded cable without cable end is AWG 30 (0,0507 mm2). (2) Depending on stranding.
NOTE: When using a cable end, check that the overall section does not exceed wire capability of the terminal block 4.0 mm2.
Sensor Power Supply
When available, power supply modules have a built-in power supply providing a voltage of 24 Vdc which is used to supply power to the sensors.
Sensors connected to the modules of one rack must be powered from this rack or from an external power supply. Using power from a different rack will cause unintended equipment operation and incorrect activation of outputs, and may damage the power supply module.
WARNING
UNINTENDED EQUIPMENT OPERATION
Do not power sensors connected to the modules of one rack with the power supply of another rack.
Failure to follow these instructions can result in death, serious injury, or equipment damage.
Direct Current Network
As the direct current power supply modules BMXCPS2010, BMXCPS3020(H), and BMXCPS4022(H) has a strong signaling current, it is recommended not to use these modules on direct current networks which have a fold back current limiting protection.
NOTE: If the power supply module is connected to a direct current network, the length of the power supply cable must be limited in order to avoid transmission losses.
The following table gives the maximum length of the power supply cables:
Power supply module
Copper wire size
2.5 mm2 (12 AWG)
1.5 mm2 (14 AWG)
BMXCPS2010
30 m (98.4 ft)
20 m (65.6 ft)
BMXCPS3020(H)
BMXCPS4022(H)
15 m (49.2 ft)
10 m (32.8 ft)
NOTE: You can double the maximum length for “there and back”.