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Mains frequency SK 22 SK 25 —

60 Hz 67 68 —

Noise pressure level in operation at maximum working gauge pressure as per ISO 2151 and the

basic standard ISO 9614-2, uncertainty: ±3 dB(A)

Tab. 22 Noise emission [dB(A)]

2.13 Electrical connection

The machine is designed in accordance with the conditions for an electrical power supply specified

in EN 60204-1 (IEC 60204-1) section 4.3.

If no other conditions are specified by the operator, the thresholds described in this standard must

be adhered to.

It is recommended that the user and the supplier reach an agreement on the basis of EN 60204-1,

Annex B.

For electrical connection of the machine, a symmetric three-phase supply is necessary.

In a symmetrical three-phase supply the phase angles and voltages are all the same.

Incoming line within the switching cabinet to be as short as possible.

If external sensors or communications lines are to be connected to the machine, use shielded ca‐

bles and insert the same through EMC connections into the switching cabinet.

This machine may only be supplied from an earthed TN or TT three-phase supply in which

the neutral point is earthed.

The connection to an IT three-phase supply or a three-phase supply with one earthed phase

is not permitted.

Further information The wiring diagram in chapter 13.4 contains further details of the power supply connection.

2.14 Power supply specifications

Supply diameters and fusing (class gG) are selected according to DIN VDE 0100 part 430

(IEC 60364-4-43) and DIN VDE 0298-4:2013-06 if the following conditions are met:

■ multi-core copper conductors at an operating temperature up to 70 °C

■ Cable length <50 m

■ For an ambient temperature of 30 °C

■ Wiring type C, without cable contact

■ Current carrying capacity: Table 3 Column 11

(European Harmonisation Directive HD 60364-5-522011)

■ Bundled cables: Table 21

─ Single layer on wall or floor

─ Spacing ≥ outside diameter

2 Technical Specifications

2.13 Electrical connection

901848 21 E

Operating Manual Rotary screw compressor

KAESER SK Series User Manual

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