Minimum Air Clearances; Internal Equipotential Bonding; Cable Glands - Siemens SIMOTICS XP 1MB1 series Operating Instructions Manual

6.2.1.10

Minimum air clearances

After proper installation, verify that the minimum air clearances between non-insulated parts
are maintained. Be aware of any protruding wire ends.
Table 6- 2
Rms value of the alternating
Values apply at an installation altitude of up to 2000 m.
When determining the required minimum air clearance, the voltage value in the table may be in-
creased by a factor of 1.1, so that the rated input voltage range is taken into account during gen-
eral use.
6.2.1.11

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.
6.2.2

Cable glands

Cable glands with (sheet metal) nuts (EN 50262)
1LA5/6/7/9, 1LG4/6, 1MA6/7, 1MB..1/2/3/4/5 - SH 63 ... 355
Operating Instructions, 06/2018, A5E44455710A
Minimum air clearance dependent on rms value of the alternating voltage
U
voltage
rms
≤ 250 V
≤ 500 V
≤ 630 V
≤ 1000 V
Minimum air clearance
Ex tc Ex nA
Ex tb Ex ec
3.0
3.0
5.5
8.0
①
Nut
O ring
②
Electrical connection
6.2 Connecting the machine
U
rms
mm
Ex e
Ex eb
2.5
5.0
5.5 10.0
8.0 14.0
5.0
8.0
75