29.1 ELECTRICAL WIRING DIAGRAMS 553

29.1.1 Selecting Voltages 557

29.1.2 Grounding 558

29.1.3 Wiring 561

29.1.4 Suppressors 561

29.1.5 PLC Enclosures 562

29.1.6 Wire and Cable Grouping 563

29.2 FAIL-SAFE DESIGN 564

29.3 SAFETY RULES SUMMARY 564

29.4 SUMMARY 565

29.5 PRACTICE PROBLEMS 566

29.6 ASSIGNMENT PROBLEMS 566

29.1 PRACTICE PROBLEM SOLUTIONS 567