Vacon 20 CP, Installation, Technical And Maintenance Manual

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Power cabling vacon • 36
Service support: find your nearest Vacon service center at www.vacon.com
4
4.1 Circuit breaker
Please disconnect the drive via an external circuit breaker. You have to provide a switching de-
vice 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 is has a capacity of 1.5 to 2 times the inverter’s rated
current (see Table 30).
NOTE: circuit breaker is not allowed in installations where C-UL is required. Only fuses are
recommended.
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 75°C. Use Class 1 wire only.
The units are suitable for use on a circuit capable of delivering no more than 50,000 rms sym-
metrical amperes, 600V AC maximum, when protected by T or J class fuses.
Integral solid state short circuit protection does not provide branch circuit pro-
tection. Branch circuit protection must be provided in accordance with the
National Electrical Code and any additional local codes.