Siemens SIMOTICS XP 1MB1 series - Cable Entries, Sealing Plugs and Thread Adapters; Connecting the Grounding Conductor; Minimum Surface Area of Grounding Conductor

Electrical connection
6.4 Connecting the grounding conductor
1LA5/6/7/9, 1LG4/6, 1MA6/7, 1MB..1/2/3/4/5 - SH 63 ... 355
Operating Instructions, 06/2018, A5E44455710A
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6.3.1
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.
Note the following when mounting:
● Avoid damaging the cable jacket.
● Adapt the tightening torques to the cable jacket materials.
Observe the documentation for tightening torques of the cable entries and sealing plugs for
direct mounting at the machine as well as additional glands (e.g. adapters).
6.4
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.
6.4.1
Minimum surface area of grounding conductor
Table 6- 3 Minimum cross-sectional area of grounding conductor
Minimum cross-section of the phase conductor
for installation
S
[mm²]
Minimum cross-section of the associated ground-
ing connection
[mm²]
S ≤ 25
S
25 < S ≤ 50 25
S > 50
0.5 S