NETZSCH NM125BY B.1 Series - Further Operating Conditions; Minimum Cross Section of Bonding Conductors; Structure and Method of Use

Motors – Operating and Assembly Instructions
40 B 1091 en-3118
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3.3.9 Further operating conditions
Unless otherwise specified for operating modes and tolerances in the test certificate, the power rating
plate or in IECEx CoC, electrical machinery is designed for continuous operation and normal infrequent
start-ups where insignificant start-up heating occurs. The motors may only be used for the type of
operation stated on the name plate.
The installation instructions must be strictly observed.
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3.3.10 Structure and method of use
The motors are self-cooling. Shaft sealing rings are fitted both on the output side (DS) and on the
ventilation side (VS). Motors for Zone 21 and Zone 22 have metal fans. Motors with brakes for Zone 22
(Category 3D, non-conducting dust) have a special plastic fan. The motors have protection class IP55,
optionally protection class IP 66 (Zone 22 . non-conducting dust, EPL Dc) or IP 66 (Zone 21, EPL, Db).
Under normal operating conditions, the surface temperature does not exceed the surface temperature
stated on the name plate.
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3.3.11 Minimum cross section of bonding conductors
Cross section of the phase conductor
of the installation S [mm
2
]
Minimum cross section of the associated
protective conductor S
P
[mm
2
]
S ≤ 16 S
16 < S ≤ 35 16
S > 35 0.5 S
224