Class F case studies
Class F · Put your knowledge to work in context.
The Class F credential is a licensing category used for a defined scope of trade or technical work, and this page is an independent study resource for candidates preparing for that licence. It suits people entering the field who need a first licence, as well as experienced workers moving into a role that requires formal certification. Because no authoritative source was supplied when this page was prepared, the domain list and weightings shown here are provisional and should be checked against the official licensing body before you rely on them for study planning. The exam content is organised into five broad areas: regulations and licensing requirements, safety practices and procedures, equipment and system components, installation and maintenance, and inspection, testing, and troubleshooting. The Class F case studies are 5 cases and about 1,869 words.
1Overloaded Service Panel and EV Charger Addition
A homeowner with a 100 A, 120/240 V single-phase service panel wants to add a 48 A continuous EV charger. The panel currently has a 40 A electric range, a 30 A dryer, a 30 A water heater, and a 20 A garage circuit.
422 words, about 2 min2Lockout/Tagout on a Rooftop Unit with Stored Energy
A technician is assigned to replace a failed compressor contactor on a rooftop HVAC unit. The unit has a disconnect with a padlockable handle, but the technician's lock is too large for the hole.
453 words, about 2 min3Sizing Conductors for a Long Run with Voltage Drop
A 240 V, 50 A single-phase subpanel is to be installed 180 ft from the main panel. The load is a 40 A continuous welder.
297 words, about 1 min4Replacing a Motor Starter with Incorrect Overload Setting
A maintenance technician is replacing a failed motor starter on a 5 HP, 230 V, 3-phase conveyor motor. The motor nameplate shows a service factor of 1.15 and a full-load current of 14 A.
337 words, about 2 min5Inspection of a Newly Installed Grounding Electrode System
An inspector is reviewing a new service installation. The grounding electrode conductor (GEC) is 6 AWG copper, run from the service panel to a ground rod 25 ft away.
360 words, about 2 min