Internal Equipotential Bonding; Tightening Torques; Cable Entries, Sealing Plugs And Thread Adapters; Connecting The Grounding Conductor - Siemens SIMOTICS XP Operating Instructions Manual

Electrical connection

6.2 Tightening torques

6.1.4

Internal equipotential bonding

The internal equipotential bonding between the grounding terminal in the terminal box, the
terminal box components and the machine enclosure is ensured via metallic contact, a
copper braided strip or a stranded wire.
6.2 Tightening torques
Note the information in Chapter Tightening torques (Page 145).
6.2.1

Cable entries, sealing plugs and thread adapters

All cable entries and sealing plugs must be approved for use in the respective hazardous
zone.
• Any openings that are not being used must be sealed using the appropriate certified
sealing plugs.
• Please observe the manufacturer's specifications when fitting cable entries.
6.3

Connecting the grounding conductor

The machine's grounding conductor cross-section must comply with EN / IEC 60034-1.
Please also observe installation regulations such as those specified in EN / IEC 60204-1.
Basically, there are two ways of connecting a grounding conductor to the machine.
• Internal grounding with a connection in terminal box at the location intended for this
purpose and marked accordingly.
• External grounding with connection at the stator housing at the locations intended for
this purpose and marked accordingly.
Table 6- 3
Minimum cross-section of the phase conductor
72
Minimum cross-sectional area of grounding conductor
for installation
S
[mm²]
S ≤ 25
25 < S ≤ 50
S > 50
Minimum cross-section of the associated
grounding connection
[mm²]
S
25
0.5 S
1MB..5/6 shaft height 71 ... 355
Operating Instructions, 10/2021, A5E41926185A