CIC Grade A Electrical Trade Test key terms

Japanese law governing the safety of electrical facilities, defining technical standards, work categories, and the licensing required for installation and inspection work. Grade A holders may work on larger, higher-voltage installations.

Japanese law that establishes the electrical worker license system, restricts who may perform wiring work, and sets obligations such as carrying a license and reporting serious accidents to authorities.

The higher of the two Japanese electrical worker licenses, permitting general electrical work including high-voltage installations and work on large-scale facilities that second-class holders may not perform.

The entry-level Japanese electrical worker license, allowing work on general-use electrical installations of limited scale and voltage, but excluding the high-voltage and large-capacity work reserved for first-class holders.

The practical skills examination in the Japanese electrical worker certification, in which candidates build specified circuits within a time limit and are scored on correct wiring, connections, and finishing.

The written examination portion of the Japanese electrical worker certification, covering electrical theory, wiring methods, regulations, and safety, usually passed before the practical skills test is attempted.

A wiring diagram that shows every conductor and connection point of a circuit, including neutrals and ground wires, used to plan and verify installation before actual wiring work.

A simplified one-line diagram representing a circuit with single lines and symbols, showing the logical arrangement of switches, outlets, and loads without drawing each individual conductor.

A drawing that specifies the routing, type, and size of wiring, the positions of equipment and outlets, and the circuit arrangement for an electrical installation.

The reduction in voltage along a conductor caused by its resistance and the current flowing through it, limited by regulations to keep appliance performance and safety within acceptable bounds.

The relationship stating that voltage equals current multiplied by resistance, used constantly to calculate circuit values, voltage drops, and equipment ratings in both design and troubleshooting.

Calculation of electrical power from voltage, current, and power factor, used to size circuits, select protective devices, and confirm loads remain within installation capacity.

The ratio of real power to apparent power in an alternating-current circuit, indicating how effectively current does useful work; low values increase current for the same delivered power.

An alternating-current supply using three voltages displaced by one-third of a cycle, commonly used for motors and larger loads because it delivers steady power with smaller conductors.

A distribution method supplying two live conductors and a neutral from a center-tapped source, giving two lower-voltage circuits and one higher-voltage circuit while sharing the neutral return current.

The grounded conductor of a distribution system that serves as the return path for line-to-neutral circuits and is normally kept near earth potential for safety.

Deliberate connection of a conductive part to earth, performed for system grounding or equipment protection so that fault current has a safe path and touch voltage is limited.

The resistance between a grounding electrode and surrounding earth, measured to confirm the grounding system meets the maximum value required for the installation class.

The resistance of insulation between live conductors and earth or between conductors, measured with an insulation tester to detect deterioration before it causes leakage or failure.

A test instrument applying a high direct voltage to measure insulation resistance; selecting the correct test voltage and confirming the circuit is de-energized are essential before use.

A device used to confirm whether a conductor or circuit is live before work begins, forming a critical step in the lockout and verification procedure for safe isolation.

A protective device that detects imbalance between live and return currents and trips the circuit, limiting the duration of earth-fault current and reducing electric-shock risk.

A breaker that automatically opens a circuit when current exceeds its rating, protecting conductors and equipment from overload and short-circuit damage.

A molded-case circuit breaker used in distribution boards for overcurrent protection of branch circuits, resettable after tripping and often combined with earth-leakage protection.

An enclosure containing main and branch breakers that receives supply from the service entrance and distributes it to individual circuits within a building.

The main conductors carrying power from the service entrance or transformer to distribution boards, sized for total downstream load and protected by a suitable overcurrent device.

A circuit extending from the final overcurrent protective device in a distribution board to outlets or equipment, sized according to the load and the outlet rating it supplies.

The maximum current a conductor may carry continuously under specified conditions without exceeding its temperature rating, affected by insulation type, ambient temperature, and grouping.

An assembly of one or more insulated conductors enclosed in a protective sheath, selected by conductor size, insulation material, and the installation environment in which it is used.

A rigid or flexible conduit that routes and mechanically protects conductors, with fill and bending limits set so wires can be pulled without damage and heat can dissipate.

A wiring method using metal conduit as mechanical protection and, where permitted, as the equipment grounding path, requiring secure supports, proper bends, and bonded connections.

A wiring method in which sheathed cable is installed directly on or within building surfaces, subject to rules on support spacing, protection from damage, and permitted locations.

A machine converting electrical energy into rotating mechanical force; motor circuits require overload protection, a disconnecting means, and conductors sized for starting and running current.

A contactor combined with a thermal overload relay, used to start and stop motors and to disconnect them automatically when sustained overcurrent heats the relay element.

Work performed after a circuit has been isolated, locked out, and verified de-energized, following a defined sequence so no unexpected re-energization can endanger workers.

The passage of electric current through the human body, whose severity depends on current magnitude, path, and duration; prevention relies on insulation, grounding, and residual-current protection.

In Japanese electrical regulations, a voltage class above low voltage and up to a specified upper limit, requiring stricter installation standards and first-class licensed workers.