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7 Preparations for commissioning
29
Recommended supply cable cross-sections and fuses for multi-wire cables or three current-carrying
conductors in raceway based on 86 °F ambient temperature
Line cross section
conductor rated
Compressor type
Supply
voltage
Installed
nominal motor
power
Fuse(s)
protection
(slow-blow
fuse) class J
140°F
167°F
194°F
[V]
[hp]
[A]
60-Hz-compressors
200V
175
AWG4/0
AWG3/0
AWG2/0
230V
150
AWG3/0
AWG2/0
AWG1/0
460V
70
AWG3
AWG4
AWG4
L30
575V
40
60
AWG4
AWG6
AWG6
L30RS
460V
40
70
AWG3
AWG4
AWG4
200V
200
MCM250
AWG4/0
AWG3/0
230V
175
AWG4/0
AWG3/0
AWG2/0
460V
90
AWG2
AWG3
AWG4
L37
575V
50
70
AWG3
AWG4
AWG6
L37RS
460V
50
90
AWG1
AWG3
AWG3
200V
250
MCM350
MCM300
AWG4/0
230V
200
MCM300
AWG4/0
AWG3/0
460V
100
AWG1/0
AWG2
AWG2
L45, L50
575V
60
80
AWG2
AWG3
AWG4
L45RS
460V
60
110
AWG1/0
AWG1
AWG2
Notes on the table:
Ultimately the type of cable you use, its length and
installation conditions (temperature, accumulation) are
outside the scope of our knowledge. Therefore the
above table only offers guidelines.
The gauges named in the table correspond to those in
UL508A. (Rubber sheathed cable at 86 °F and max.
55 yd cable length)
* If conditions differ (cable length, temperature and
accumulation) the gauge must be determined according
to UL508A. The cable type must also be taken into
consideration.
7.3.1
Check setting of the fan protection
switch (only for L30RS-L45RS)
Check the setting of the motor protection switch in
accordance with the enclosed circuit diagram for the
compressor.
Set the protection switch to the value stated in the table
corresponding to the mains voltage and frequency (see
circuit diagram).
7.3.2
Checking the setting of the control-
power transformer
DANGER
High Voltage – Hazard of Shock, Burn, or
Death.
•
The electrical connection should be
made by a qualified electrician.
•
Only perform checks and carry out work
on the screw compressor when the unit
is out of operation, depressurized, and
secured from being switched on again!
NOTICE
Incorrectly setting the control transformer poses
a risk to the trouble-free operating of the
system.
Checking the setting of the control transformer
is part of commissioning and part of regular
inspection/maintenance because the supply
voltage can change.
The correct setting should be checked by
measuring the control transformer
ʼ
s output
voltage while the system is running with a load.
Summary of Contents for L30RS
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