4
vacon • 30 Power cabling
Local contacts: http://drives.danfoss.com/danfoss-drives/local-contacts/
4.1 Circuit breaker
Please disconnect the drive via an external circuit breaker. You have to provide a switching device
between supply and main connection terminals.
When connecting the input terminals to the power supply using a circuit breaker, observe that this
is of type B or type C and ensure it has a capacity of 1.5 to 2 times of the inverter’s rated current
(see Table and Table 29).
NOTE: circuit breaker is not allowed in installations where C-UL is required. Only fuses are recom-
mended.
4.2 UL standards on cabling
To meet the UL (Underwriters Laboratories) regulations, use a UL-approved copper cable with a
minimum heat-resistance of +70/75°C. Use Class 1 wire only.
The units are suitable for use on a circuit capable of delivering not more than 100,000 rms symmet-
rical amperes, 500V AC maximum, when protected by T or J class fuses.
Integral solid state short circuit protection does not provide branch circuit protection.
Branch circuit protection must be provided in accordance with the National Electrical
Code and any additional local codes.
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