EEA Electrician Exam flashcards
EEA Electrician Exam · Build recall with a focused review session.
33 cards. Read the term and the definition here. The deck at the top of this page is optional.
- Ohm's Law
- Current equals voltage divided by resistance (I = E/R). In AC circuits, replace resistance with impedance Z and account for the phase angle between voltage and current.
- Three-Phase Power Formula
- For a balanced three-phase load, real power P = √3 × line voltage × line current × power factor. Apparent power S = √3 × E × I, expressed in volt-amperes.
- Conductor Resistance Formula
- R = ρL/A, where ρ is resistivity in circular-mil-ohms per foot, L is length in feet, and A is area in circular mils. Resistance rises with length and temperature and falls with area.
- Power Factor
- The ratio of real power in kW to apparent power in kVA, equal to the cosine of the phase angle. A low power factor increases current for the same delivered real power.
- NM Cable Restrictions
- Nonmetallic-sheathed cable is permitted in dry locations and in some concealed spaces but is generally prohibited in wet locations, hazardous locations, and where subject to physical damage.
- Raceway Fill Limits
- Conductors in a raceway may not exceed a set percentage of interior cross-sectional area: 53% for one conductor, 31% for two, and 40% for three or more.
- Box Fill Calculation
- Box volume must accommodate each conductor, clamp, support fitting, device, and equipment grounding conductor using table volume allowances based on conductor size.
- Conductor Ampacity Adjustment
- Ampacity is reduced for high ambient temperature and for more than three current-carrying conductors in a raceway or cable, using adjustment factors from the code tables.
- Continuous Load Rule
- A continuous load is one expected to operate at maximum current for three hours or more. It is calculated at 125% for branch-circuit and feeder sizing.
- Small-Appliance Branch Circuits
- Dwelling kitchen small-appliance circuits are 20 A and must not supply other outlets. At least two are required, and each is counted at 1500 VA in the standard calculation.
- General Lighting Load
- Dwelling general lighting load is based on floor area at 3 VA per square foot (about 33 VA/m²). Other occupancies use different VA per area values from the code table.
- Standard Service Calculation
- Sum general lighting, small-appliance, laundry, and other loads; apply demand factors; add the largest motor at 125%; then size service conductors and equipment for the result.
- Service Neutral Bonding
- The grounded service conductor is bonded to the service enclosure and grounding electrode system at the service disconnect only. Downstream panels keep neutral and ground separate.
- Equipment Grounding Conductor Sizing
- The equipment grounding conductor is sized from the rating of the overcurrent device protecting the circuit, not from the phase conductor ampacity alone.
- Grounding Electrode System
- Includes metal underground water pipe, metal building frame, concrete-encased electrode, ground ring, rods, pipes, and plates. The grounding electrode conductor connects them to the service.
- Bonding Around Water Meter
- A bonding jumper is required around water meters and other removable or insulating sections of metallic piping so the grounding path remains continuous when the section is removed.
- Next-Higher Overcurrent Rating
- Where the calculated load does not exceed 800 A and conditions are met, the next standard overcurrent device rating above the calculated load may be used.
- Short-Circuit Current Rating
- Equipment SCCR must equal or exceed the available fault current at its installation point. Series-rated combinations must be listed and marked as a series combination.
- Interrupting Rating
- The maximum short-circuit current a fuse or circuit breaker can safely interrupt at its rated voltage. It must be at least the available fault current at the device terminals.
- Overcurrent Coordination
- Time-current curves are compared so the downstream device clears a fault before the upstream device operates, limiting the outage to the affected portion of the system.
- Motor Branch-Circuit Conductors
- Motor branch-circuit conductors are sized at 125% of the motor full-load current from the code table, not from the nameplate current used for overload sizing.
- Motor Overload Protection
- Overload devices protect the motor from sustained overheating and are set from nameplate current or table values. They are separate from branch-circuit short-circuit protection.
- Motor Disconnect Location
- A motor disconnecting means must be within sight from the controller and motor, or be lockable where the code permits a remote location.
- HVAC Nameplate MCA and MOP
- Hermetic refrigerant equipment nameplates give minimum circuit ampacity and maximum overcurrent protective device rating. Conductors are sized from MCA and protection from MOP.
- Hazardous Location Classification
- Class I covers gases and vapors, Class II dusts, and Class III fibers. Division or Zone and Group further define the hazard, and equipment must be listed for that classification.
- Bathroom Receptacle Requirements
- Bathroom receptacles require GFCI protection, and receptacles near sinks and in damp locations need GFCI protection and covers suitable for the environment.
- Swimming Pool Equipotential Bonding
- Metal parts of pool structures, equipment, and associated metal within the specified distance must be bonded together to equalize potential and reduce shock hazard.
- Photovoltaic Rapid Shutdown
- PV systems require a rapid shutdown function that reduces conductor voltage within the array to a safe level for firefighters, plus listed DC-rated equipment and labeling.
- NEC Article 100 Definitions
- Article 100 defines terms such as listed, labeled, approved, and identified. These definitions control how requirements are applied throughout the code.
- Arc Flash Incident Energy
- Calculated energy at a working distance from an arc source, expressed in cal/cm². It determines the arc flash boundary and the required PPE level.
- Electrical Working Clearance
- The code specifies minimum depth and width of working space in front of electrical equipment based on voltage and condition, so live parts can be worked safely.
- Dwelling General Lighting Load
- Calculate dwelling general lighting load from floor area at 3 VA per square foot (about 33 VA/m²), then apply the dwelling demand factors to determine the service load.
- Panel Schedule Verification
- Check connected load, demand load, bus rating, main breaker rating, and spare spaces. Confirm the calculated demand does not exceed the panel and service ratings.