Internal Equipotential Bonding; Tightening Torques; Cable Entries, Sealing Plugs And Thread Adapters; Connecting The Grounding Conductor - Siemens SIMOTICS XP 1MB 5/6 Series Operating Instructions Manual

Electrical connection
6.3 Connecting the grounding conductor
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 155).
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
82
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, 11/2023, A5E52779956A