CTM 155
Commercial Wiring I
Coconino Community College · UGRD · Fall 2026
Catalog description
Three lecture. One lab. This class will emphasize Light Commercial Wiring Applications to determine sizes of service entrance conductors and feeders, conduit sizes and boxes, Transformer types, theory and sizing, and protection of transformers: referencing to the National Electric Code. Students will be able to: determine wire size, conduit and box size; interpret specific articles of the National Electrical Code (NEC); interpret National Electrical Code Requirements for circuits for outlets, appliances, lighting and heating; determine sizing requirements for service entrances, feeder conductors, conduit, fittings & overcurrent protection devices as per the National Electrical Code; determine sizing requirements for Sub Feed panels and Branch Circuits; interpret National Electrical Code requirement for grounding, bonding and over current protective; interpret National Electrical Code requirements for motors ratings; apply specific components to a motor control circuit; interpret Commercial Electrical blueprints for quantity take offs, Circuit & Conduit layouts, and labor estimates. Prerequisite(s): CTM 151 Grading Option: May be taken for S/U credit.
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