Rockwell Automation 1336T Wiring and Grounding Guide, (PWM) AC Drives - Manual (Page 14)

14 Rockwell Automation Publication DRIVES-IN001M-EN-P - March 2014
Chapter 1 Wire/Cable Types
Insulation Thickness and Concentricity
Wire must have an insulation thickness of
≥ 15 mil (0.4 mm/0.015 in.). The wire
insulation must not have significant variations of concentricity around the wire.
Figure 4 - Insulation Concentricity
Geometry
The physical relationship between individual conductors is important in drive
installations.
Individual conductors in conduit or cable trays have no fixed relationship and are
subject to cross coupling of noise, induced voltages, excess insulation stress, and
other possible interference.
Fixed geometry cable (cable that keeps the spacing and orientation of the
individual conductors constant) offers significant advantages over individual
loose conductors, including reduced cross-coupling noise and insulation stress.
Three types of fixed geometry, multi-conductor cables are discussed in this
section. See
Unshielded Cable on page 15 , Shielded Cable on page 16 , and
Armored Cable on page 17 .
Table 1 - Recommended Cable Design
Unacceptable Acceptable
Type Max Wire Size Where Used Rating/Type Description
Type 1 2 AWG Standard installations
100 Hp or less 600V, 90 °C (194 °F)
XHHW2/RHW-2
Four tinned copper conductors with cross-linked polyethylene (XLPE)
insulation
Type 2 2 AWG Standard installations
100 Hp or less
with brake conductors
600V, 90 °C (194 °F)
RHH/RHW-2
Four tinned copper conductors with XLPE insulation plus one shielded pair of
brake conductors.
Type 3 500 MCM AWG Standard installations
150 Hp or more Tray-rated 600V, 90 °C (194 °F)
RHH/RHW-2
Three tinned copper conductors with XLPE insulation and three bare copper
grounds and polyvinyl chloride (PVC) jacket.
Type 4 500 MCM AWG Water, caustic chemical,
crush resistance Tray-rated 600V, 90 °C (194 °F)
RHH/RHW-2
Three bare copper conductors with XLPE insulation and three copper grounds
on 10 AWG and smaller. Acceptable in Class I and II, Division I and II locations.
Type 5 500 MCM AWG 690V applications Tray-rated 2000V, 90 °C (194 °F) Three tinned copper conductors with XLPE insulation. Three bare copper
grounds and PVC jacket.
IMPORTANT: If terminator network or output filter is used, connector
insulation must be XLPE, not PVC.