Inserting And Routing The Cables; Bringing Cables Into The Terminal Box 1Xb; Table 6-2 Connection Technology (With Cable Lug / Connection Without Cable Lug) - Siemens SIMOTICS FD 1MQ1 Operating And Installation Instructions

Electrical connection

6.5 Inserting and routing the cables

Requirements placed on drilled holes in Zone 21/22
For applications in Zone 21 (Ex tb) or Zone 22 (Ex tc), according to EN 60079-31, the following
requirements are placed on drilled holes:
Through holes:
● The nominal diameter of the through holes for the entry may not be 0.7 mm larger than the
● The inside of the terminal box must have sufficient space to attach a locking nut at the cable
Openings with thread must have the following attributes:
● Conical thread: Without additional sealant or seals, not less than three and one half thread
● Cylindrical threads: At least five thread turns, tolerance of 6 H, even better according to
6.5 Inserting and routing the cables
Table 6-2
Terminal box
GT640
1XB1621
1XB1631
1XB7730
1XB7731
1XB7740
1XB7750
6.5.1 Bringing cables into the terminal box 1XB... with sealing insert with break-off ring
The 1XB1621, 1XB1631 terminal boxes can be equipped optionally with a sealing insert with
break-off ring. The connecting cable is sealed at the cable entry location using a cut-out sealing
insert and is fastened using a strain relief device.
80
nominal diameter of the thread of the cable entry or connection element.
entry or at the connection element.
turns.
ISO 965-1. For less than five thread turns, an additional seal or sealant is required.
Connection technology (with cable lug / connection without cable lug)
With cable lug (Page 83)
Connection
Without cable lug (Page 84)
Operating Instructions 01/2019
SIMOTICS FD 1MQ1