Rockwell Automation 1336T Wiring and Grounding Guide, (PWM) AC Drives - Manual (Page 64)

64 Rockwell Automation Publication DRIVES-IN001M-EN-P - March 2014
Chapter 4 Best Practices
Spacing Notes
1. Both outgoing and return current carrying conductors are pulled in the
same conduit or laid adjacent in tray.
2. These cable levels can be grouped together:
a. Level 1: Equal to or above 601V.
b. Levels 2, 3, and 4 can have respective circuits pulled in the same conduit
or layered in the same tray.
c. Levels 5 and 6 can have respective circuits pulled in the same conduit or
layered in the same tray.
d. Levels 7 and 8 can have respective circuits pulled in the same conduit or
layered in the same tray.
e. Levels 9, 10, and 11 can have respective circuits pulled in the same
conduit or layered in the same tray.
3. Level 7 through level 11 wires must be shielded per recommendations.
4. In cable trays, steel separators are advisable between the class groupings.
5. If conduit is used, it must be continuous and composed of magnetic steel.
6. This table lists the spacing of communication cables, levels 2 through 6.
EXAMPLE Spacing relationship between 480V AC incoming power leads and 24V DC logic
leads:
• 480V AC leads are Level 2; 24V AC leads are Level 6.
• For separate steel conduits, the conduits must be 76 mm (3 in.) apart.
• In a cable tray, the two groups of leads must be 152 mm (6 in.) apart.
IMPORTANT The cable bundle must not exceed conditions of NEC 310.
IMPORTANT Encoder cables run in a bundle can experience some amount of EMI
coupling. The circuit application dictates separate spacing.
IMPORTANT Communication cables run in a bundle can experience some amount of
EMI coupling and corresponding communication faults. The
application dictates separate spacing.
Conduit Spacing Through Air Spacing
115V = 25.4 mm (1 in.) 115V = 50.8 mm (2 in.)
230V = 38.1 mm (1.5 in.) 230V = 101.6 mm (4 in.)
460/575V = 76.2 mm (3 in.) 460/575V = 203.2 mm (8 in.)
575V = proportional to 152.4 mm (6 in.) per 1000V 575V proportional to 304.8 mm (12 in.) per 1000V