Sailer Manual HPVFE
13
Power Wiring
ATTENTION:
National Codes and standards (NEC, VDE, BSI, etc.) and local codes outline
provisions for safely installing electrical equipment. Installation must comply with specifications
regarding wire types, conductor sizes, branch circuit protection and disconnect devices. Failure to
do so may result in personal injury and/or equipment damage.
ATTENTION:
To avoid a possible shock hazard caused by induced voltages, unused wires in the
conduit must be grounded at both ends. For the same reason, if a drive sharing a conduit is being
serviced or installed, all drives using this conduit should be disabled. This will help minimize the
possible shock hazard from “cross coupled” power leads.
Motor Cable Types Acceptable for 200-600 Volt Installations
General
A variety of cable types are acceptable for drive installations. For many installations, unshielded cable
is adequate, provided it can be separated from sensitive circuits. As an approximate guide, allow a
spacing of 0.3 meters (1 foot) for every 10 meters (32.8 feet) of length. In all cases, long parallel runs
must be avoided. Do not use cable with an insulation thickness less than 15 mils (0.4 mm/0.015 in.).
Do not route more than three sets of motor leads in a single conduit to minimize “cross talk”. If more
than three drive/motor connections per conduit are required, shielded cable must be used.
UL installations in 50°C ambient must use 600V, 75°C or 90°C wire.
UL installations in 40°C ambient should use 600V, 75°C or 90°C wire.
Use copper wire only. Wire gauge requirements and recommendations are based on 75 degree C. Do
not reduce wire gauge when using higher temperature wire.
Unshielded
THHN, THWN or similar wire is acceptable for drive installation in dry environments provided
adequate free air space and/or conduit fill rates limits are provided.
Do not use THHN or similarly
coated wire in wet areas
. Any wire chosen must have a minimum insulation thickness of
15 mils and should not have large variations in insulation concentricity.