Cable, Power 2-33
Cable, Power
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 or equal to 15 mils (0.4 mm/0.015 in.).
Shielded/Armored
Shielded cable is recommended if sensitive circuits or devices are
connected or mounted to the machinery driven by the motor.
Figure 2.4 Recommended Power Wire
Based on field and internal testing, Rockwell Automation/Allen-Bradley
has determined conductors manufactured with Poly Vinyl Chloride (PVC)
wire insulation are subject to a variety of manufacturing inconsistencies
which can lead to premature insulation degradation when used with IGBT
drives that produce the reflected wave phenomena. Flame-retardant
heat-resistant thermoplastic insulation is the type of insulation listed in the
NEC code for the THHN wire designation. This type of insulation is
commonly referred to as PVC. In addition to manufacturing
inconsistencies, the physical properties of the cable can change due to
environment, installation and operation, which can also lead to premature
insulation degradation. The following is a summary of our findings:
!
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.
Location Rating/Type Description
Standard
(Option 1)
600V, 90°C (194°F)
XHHW2/RHW-2
Anixter
B209500-B209507,
Belden 29501-29507,
or equivalent
• Four tinned copper conductors with XLP insulation.
• Copper braid/aluminum foil combination shield and
tinned copper drain wire.
• PVC jacket.
Standard
(Option 2)
Tray rated 600V, 90° C
(194° F) RHH/RHW-2
Anixter OLF-7xxxxx or
equivalent
• Three tinned copper conductors with XLPE insulation.
• 5 mil single helical copper tape (25% overlap min.) with
three bare copper grounds in contact with shield.
• PVC jacket.
Class I & II;
Division I & II
Tray rated 600V, 90° C
(194° F) RHH/RHW-2
Anixter 7V-7xxxx-3G or
equivalent
• Three bare copper conductors with XLPE insulation and
impervious corrugated continuously welded aluminum
armor.
• Black sunlight resistant PVC jacket overall.
• Three copper grounds on #10 AWG and smaller.
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