UL Power-limited Wiring Requirements Overview186 AFP-200 PN 15511:H2 10/14/2002Appendix K UL Power-limited Wiring RequirementsK.1 OverviewThis appendix provides guidelines for power-limited and nonpower-limited UL wiringrequirements. Figure 165 shows typical wiring for a circuit with power-limited andnonpower-limited wiring that meets UL requirements, which are as follows:• Power-limited and nonpower-limited circuit wiring must remain separated in thecabinet• All power-limited circuit wiring must remain at least 0.25 inch (6.35 mm) awayfrom any nonpower-limited circuit wiring.• Power-limited and nonpower-limited circuit wiring cannot enter and exit thecabinet through the same knockout or conduits. Separate power-limited andnonpower-limited wiring as shown in Figure 165.K.2 Typical Circuit with Nonpower-limited and Power-limited WiringNote: For complete information on wiring an RTM-8 module, refer to “Installing anRTM-8 Module” on page 63.Figure 165 shows the RTM-8 module installed in the AFP-200 cabinet. Observe thefollowing:• Power-limited and nonpower-limited wiring maintain a minimum distance of0.25 inch (6.35 mm) wire-to-wire.• A 0.75 inch (19.05 mm) gap exists between relay 4 and relay 5. If using thismodule to drive both power-limited and nonpower-limited circuits, use relays 1-4to drive power-limited circuits and relays 5-8 to drive nonpower-limited circuits.Using relays 5-8 for nonpower-limited circuits allows grouping them with thetransmitter output nonpower-limited wiring.• If using all relays as power-limited circuits, the 0.25 inch (6.35 mm) gap betweenrelay 8 and the nonpower-limited transmitter output terminal meets ULpower-limited wiring requirements.Figure 165 Typical Wiring Diagram for UL Power-limited RequirementsPower-limited circuitsNonpower-limitedcircuits0.75-inch gap (19.05 mm)between power-limitedand nonpower-limitedcircuitsPower-limited circuitsNonpower-limitedtransmitter outputterminalAC Power0.25-inch (6.35 mm)gapTechnical Manuals Online! - http://www.tech-man.com
