In wiring diagrams, solid heavy lines usually indicate ____.

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The NATE (North American Technician Excellence) Air Conditioning and Heat Pump exams are rigorous, industry-recognized tests certifying expertise in installing, servicing, and repairing HVAC systems. Technicians must pass a 50-question Core exam plus 100-question Specialty exams in AC or Heat Pumps (scoring 70%+). Certification requires renewal every two years.  Key Details of NATE AC & Heat Pump Certification Certification Structure: To become certified, a technician must pass two exams: Core Exam: Covers fundamental knowledge (safety, tools, basic heat transfer, electrical). Specialty... Show more

In wiring diagrams, solid heavy lines usually indicate ____.