Mains Connection Box, Unfused, 2 Terminal, 20mm Screwed Entry

Black | Mains Connection Box, Unfused, 2 Terminal, 20mm Screwed Entry

Mains Connection Box, Unfused, 2 Terminal, 20mm Screwed Entry

Item Number: 645/2-BK

RRP (Inc. GST)



Qty UoM EAN Colour



Product brand



Provided equipment


Fixing mode

by screws

IP degree of protection


EU RoHS Directive


Mercury free


RoHS exemption information


China RoHS Regulation

Product out of China RoHS scope. Substance declaration for your information

Environmental Disclosure




PA (polyamide) 6


Cover type


Number of clamp


Cable entry number


Dust zone


Unit Type of Package 1


Number of Units in Package 1


Package 1 Weight

118 g

Package 1 Height

50 mm

Package 1 width

66 mm

Package 1 Length

68 mm
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Frequently Asked Questions

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What is the wall box to suit the B4/30/2 ?

 The part number for the wall box is 164/2

Can I plug my APC Rack-Mount Power Distribution Unit (Rack PDU) into a feed receptacle located in the under floor plenum? (Also applicable to Configurable & Modular Power Distribution)

Yes, provided the installation conforms to NFPA 70 the National Electric Code requirements as stated in Article 645 Information technology equipment.

With the 2008 Edition (and subsequently the 2011 Edition), Article 645.5 clearly states that cord-and-plug connections and certain cable types are allowed under raised floors, provided certain conditions are met. Following are excerpts from the 2008 Edition of the Code. Refer to the complete section of the applicable edition of the NEC for your locality.

645.5 Supply Circuits and Interconnecting Cables

(B) Cord-and-Plug Connections. The data processing system shall be permitted to be connected to a branch circuit by any of the following listed means:

(1) Flexible cord and attachment plug cap not to exceed 4.5 m (15 ft).

(2) Cord set assembly, where run on the surface of the floor, shall be protected against physical damage.

(D) Under Raised Floors. Power cables, communications cables, connecting cables, interconnecting cables, cord-and-plug connections, and receptacles associated with the information technology equipment shall be permitted under a raised floor, provided the following conditions are met:

(1) The raised floor is of suitable construction, and the area under the floor is accessible.

(2) The branch-circuit supply conductors to receptacles or field-wired equipment are in rigid metal conduit, rigid nonmetallic conduit, intermediate metal conduit, electrical metallic tubing, electrical nonmetallic tubing, metal wireway, nonmetallic wireway, surface metal raceway with metal cover, nonmetallic surface raceway, flexible metal conduit, liquidtight flexible metal conduit, or liquidtight flexible nonmetallic conduit, Type MI cable, Type MC cable, or Type AC cable. These supply conductors shall be installed in accordance with the requirements of 300.11.

(3) Supply cords of listed information technology equipment in accordance with 645.5(B).

(6) "Cables," shall be listed as Type DP. Type DP cable having adequate fire resistant characteristics suitable for use under raised floors of an information technology equipment room.

Rack Power Distribution

All of APC's Rack PDUs are UL Listed and as such meet all requirements for NEC 645 ITE data center installations. Prior to the 2008 Edition of the NEC, cord-and-plug connections under the raised floor were not explicitly identified in the 2005 Edition of the Code. However, based on the following code sections, these cord-and-plug connections of APC Rack PDUs are acceptable. 1) per 645.4(3) the equipment is UL Listed 2) per 645.5(B)(1) the flexible cord and attachment plug cap do not exceed 15 ft. 3) per 645.5(D)(2) branch-circuit supply conductors to receptacles are properly installed in accordance with 300.11 4) 645.5(D)(5) specifically relates to "cables" used under the raised floor, and not "flexible cord" as is the IT equipment power cord.

Making Power Connections to Rack PDUs Using Flexible Conduit

Some installations use wiring in flexible conduit (i.e. Sealtite) that is directly attached to a mating connector body for making the power connection to Rack PDUs. Any US installation must use methods that conform to NFPA 70 Article 300.

For 50A Rack PDUs that have CS8365 Hubbell style connector, Hubbell has a mating Pro-series connector body that can be attached directly to flexible conduit fittings. We recommend using a Hubbell Pro connector (CS8364L) with a 1/2" (H050) or 3/4" (H075) seal tight connector.

Configurable and Modular Power Distribution

Power cables from APC Configurable and Modular Power Distribution units are Type DP-1 TC-ER tray cable and per 645.5(D)(6) and Table 645-5 are allowed under raised floors.




How do you setup the ATV21 and ATV212 drives for Modbus?

ATV21/ATV212 programmed for Modbus.

Product Line:
ATV21 and ATV212


Modbus setup for the ATV21 and ATV212 drives


Monitor only set up example:

CNOD=0  terminal control
FNOD= 2 for VIB

THr = FLA of motor name plate

F----  enter
F108= 48  Force to local mode
F802= 1  modbus address
F803= 10  Time out for modbus
F807= 1  screw terminals for modbus  or 0 for RJ45 (ATV212 only)

F800= 1 19200  RJ45 port only (must be same as customers controller)
F801= 1 Even Parity RJ45 port only (must be same as customers controller)

F820= 1 19200 baud speed (must be same as customers controller)
F821=  1  Even Parity (must be same as customers controller)
F829=  1  modbus RTU (must be same as customers controller)

(note F807, F820, F821 and F829  is ATV212 only)

 Controlling speed and start stop via modbus change

CNOD=2 modbus control start and stop
FNOD= 4 for modbus speed reference

F108= 0  turn off force to local

 Indirect set up vs Direct setup:

 Indirect set up:  program in the drive F---- codes.

Writing commands to drive

F870 = 1 for CMD command word

F871= 3 for freq ref

 Reading commands from drive:

F875= 1 for ETA status (FD01) you must assign min 2 registers to read.

F876=  2 for output freq (FD00) you must assign min 2 registers to read.

F877= 3 for output current (FE03) optional read
F878= 4 for output voltage (FE05) optional read

F879= 5 for alarm code (FC91) optional read

 Assuming no offset the starting read register for status is address 1875 thru 1879.

Assuming no offset the starting write register for command and speed is address 1870 thru 1871.

 Start FWD the drive write a hex value 400 (or dec 1024) to address 1870 and  speed ref write a dec 6000 for 60 Hz to address 1871.  Works if fnod and cnod is 2 and 4.

Start REV write hex 600 or (dec 1536) to CMD

Stop write a 0 to CMD

Freq ref write a 6000 to  address 1871.

 Note 1: If fnod and cnod is 2 and 0 they can write C400 hex to cmd and it will override terminals control and start the drive.


Note 2: If you have a offset you will need to add 1 to each address you read and write to.

Example: with offset you write to address 1871 and send speed to 1872.

Direct configuration means you can write direct to words

No need to set up F870 thru 879 it’s only for indirect configuration

 Writing the command to start and stop the drive:

Starting drive in direct mode CMD word is Hex FA00 or Dec 64000 (write a Dec 1024 or hex 400 to CMD to start the drive.)
Stopping drive in direct mode CMD word is Hex FA00 or Dec 64000 (write a Dec or Hex 0 to the CMD to stop the drive)

Freq reference is hex FA01 or Dec 64001 (write a 6000 in dec for 60 Hz speed reference).


ETA status word is Hex FD01 or Dec 64769

Output frequency in Hz is Hex FD00 or Dec 64768

Output current is Hex FE01 or Dec 65027

 Note if you are offset by one you will need to add 1 to each value. 

Example: writing to 64001 for CMD and speed will be 64002 for freq reference.