20
9.4
Cable bushing panel
If a cable bushing through the panel is needed, please pay attention to the following notes and instructions, see Fig. 2
♦
Perform all work steps in the following notes and instructionFig. 2
, page 20 on both sides of the
double-walled panel.
♦
Deburr the bore holes to avoid damaging the cable.
♦
We recommend using stepped rubber to avoid damaging the cable (available at Systemair, article no. 313521).
Detailansicht
1.
2.
3.
Detailansicht
20 mm
20 mm
Fig. 2 Cable bushing panel
9.5
Protective grounding wire
The protective grounding must have a cross-section equal to or greater than that of the phase conductor.
9.6
Residual current circuit breaker
♦
All-current-sensitive residual current circuit breakers are required for use in alternating-current systems with 50/60
Hz, in combination with electronic devices such as EC motors, frequency converters or uninterruptible power supplies
(UPS).
9.7
Protecting the motor
Note:
In fans equipped with an EC motor, there is no additional motor protection needed. The motor protection is
integrated in the electronics of the motor.
Warning
Fan switches off in case of fire.
The motors of the MUB/F have no motor protection fitted as standard. Any kind of motor protection must be
bypassed in case of fire.
Important
Damage to motor due to overcurrent, overload or short circiut.
♦
Use (all-pole) circuit breaker (characteristic C or K) or motor protection switches.
♦
Always connect thermo-contacts or cold conductors to a motor protection switch.
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