GER Licensed Electrical Inspector flashcards
GER Licensed Electrical Inspector · Build recall with a focused review session.
32 cards. Read the term and the definition here. The deck at the top of this page is optional.
- Ohm's law
- Current through a resistance equals voltage divided by resistance (I = E/R). In AC circuits, impedance Z replaces R, and the relationship must account for phase angle.
- Three-phase power formula
- For a balanced three-phase load, real power equals the square root of three times line voltage times line current times power factor.
- RMS voltage
- The effective value of a sine wave, equal to peak voltage divided by the square root of two. It produces the same heating effect as an equal DC voltage.
- Parallel circuit rules
- Voltage is the same across all branches, total current is the sum of branch currents, and total resistance is found from the sum of the reciprocals.
- Conductors in parallel
- Each paralleled conductor must be 1/0 AWG or larger, of the same material, length, insulation, and termination, and arranged so current divides equally.
- Box fill calculation
- Count each conductor, each device yoke, each clamp, and equipment grounding conductors, then compare the total to the marked cubic-inch capacity of the box.
- NM cable support
- Nonmetallic sheathed cable must be secured within 12 inches of each box and at intervals not exceeding 4.5 feet along the run.
- Conduit expansion fittings
- Expansion fittings are required where thermal expansion of a conduit run exceeds a quarter inch, such as long PVC runs exposed to temperature change.
- Continuous load factor
- A load operating three hours or more is calculated at 125 percent for branch-circuit and feeder sizing; noncontinuous loads are taken at 100 percent.
- Dwelling lighting load
- General lighting in dwellings is calculated at 3 volt-amperes per square foot of floor area, plus small-appliance and laundry branch circuits at 1,500 VA each.
- Dwelling service demand factors
- Apply 100 percent to the first 3,000 VA, 35 percent to the next 117,000 VA, and 25 percent to any amount above 120,000 VA.
- Receptacle spacing rule
- In dwelling habitable rooms, no point along the floor line may be more than 6 feet from a receptacle, and wall spaces 2 feet or wider require one.
- Voltage drop recommendation
- Keep branch-circuit voltage drop under 3 percent and the combined feeder plus branch drop under 5 percent for reasonable efficiency of connected equipment.
- Neutral bonding location
- The grounded conductor is bonded to the equipment grounding system only at the service disconnecting means; downstream panels keep neutral and ground bars separate.
- Next-higher overcurrent rule
- Where conductor ampacity does not match a standard device rating, the next higher standard rating may be used if the load does not exceed conductor ampacity.
- Equipment grounding conductor sizing
- The equipment grounding conductor size is selected from the table keyed to the rating of the overcurrent device protecting the circuit, not the phase conductor alone.
- GFCI required locations
- Ground-fault protection is required for dwelling bathroom, kitchen countertop, garage, outdoor, and unfinished basement receptacles, among other specified locations.
- AFCI protection
- Arc-fault circuit-interrupter protection is required for most 120-volt branch circuits in dwelling living areas, including bedrooms, using listed devices.
- Rough-in inspection
- The inspection performed after wiring is installed but before walls or ceilings are covered, verifying box fill, support, and routing that will later be concealed.
- Correction notice content
- A correction notice should state the code section, the exact location, and the corrective action required so the installer can respond without ambiguity.
- Insulation resistance test
- A megohmmeter applies a high DC voltage to measure insulation resistance; readings below one megohm per 1,000 test volts warrant investigation.
- Polarity verification
- Testing confirms the grounded conductor is not switched, the equipment grounding conductor is continuous, and neutral and ground are separated downstream of the service.
- Working clearance depth
- At least 36 inches of clear depth, 30 inches wide and 6 feet 6 inches high is required in front of electrical equipment, with greater depth at higher voltages.
- Dedicated equipment space
- The space above and in front of switchboards and panelboards must be kept clear of piping, ducts, and foreign systems not related to the electrical installation.
- Available fault current check
- Plan review confirms that the available fault current at each point does not exceed the interrupting rating of the overcurrent devices installed there.
- Adopted code edition
- The locally adopted code edition and amendments govern enforcement; a permit is evaluated against the edition in effect at the time of application.
- Hazardous location classes
- Class I covers flammable gases and vapors, Class II covers combustible dust, and Class III covers ignitable fibers and flyings present in the area.
- Division 1 versus Division 2
- Division 1 describes a location where the hazard exists under normal operating conditions; Division 2 describes one where it exists only under abnormal conditions.
- Hazardous location seals
- Conduit seals prevent gases or vapors from passing through the conduit system and are installed at specified distances from enclosures in classified areas.
- Health care critical branch
- The critical branch in a health care facility supplies selected patient care areas and must be kept separate from the general care branch circuits.
- Inspector conflict of interest
- An inspector must disclose any financial interest in the work being inspected and decline the assignment where a conflict could affect the decision.
- Inspection record retention
- Inspection records should be retained for the period the jurisdiction requires, because they document the code basis for each approval or rejection.