4
vacon • 26
Power cabling
Local contacts: http://drives.danfoss.com/danfoss-drives/local-contacts/
4.1
Circuit breaker
Disconnect the drive via an external circuit breaker. You have to provide a switching device between
the 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 27 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 no more than 50,000 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 pro-
tection. Branch circuit protection must be provided in accordance with the
National Electrical Code
and any additional local codes.
