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12
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CABLE SIZES
The input/output cables can be sized to suit the STS rating according to the table below
4 pole model
3 pole model
Input and output cables
Cable type
STS450
STS350
25 mm
2
3 phase+1 nearth
STS4100
STS3100
35 mm
2
3 phase+1 nearth
STS4150
STS3150
50 mm
2
3 phase+1 nearth
STS4200
STS3200
70 mm
2
3 phase+1 nearth
STS4300
STS3300
95 mm
2
3 phase+1 nearth
STS4400
STS3400
120 mm
2
3 phase+1 nearth
NOTE:
The neutral conductor should be sized for 1,5 times the output phase current. The Earth conductor
should be sized as 2 times the output conductor (this is dependent on the fault rating, cable lengths,
type of protection etc.) These recommendations are for guideline purposes only and are superceded
by local regulations and codes in practice.
CONNECTIONS
InfoSTS
Series Static Transfer Switches run only on 3-Phase AC power supplies with a NEUTRAL line.
The STS unit must be grounded in accordance with electrical regulations
Before making power connections to the unit, ensure that all the incoming power sources are de-energized and
insulated
Cables can enter the
InfoSTS
from below, through the base panel of the cabinet. Top entry is also possible by
removing the cover panel on the top of the STS revealing the cables entry hole.
The connections of the STS should be supplied by grounded outlets. Cables enter the STS modules via entry
panels in the base of cabinet. All control cables should be screened and run in a separate trunking to the power
cables.
Summary of Contents for InfoSTS
Page 45: ...44 Figure 28...
Page 47: ...NOTES...