OR Electrician flashcards

32 cards. Read the term and the definition here. The deck at the top of this page is optional.

Article 90

Article 90 of the NEC states the code's purpose and scope, explains how the code is organized, and identifies installations covered and excluded.

Box fill calculation

Box fill is computed by counting conductors, clamps, devices, and equipment grounding conductors, then multiplying by the volume allowance in NEC Table 314.16(B).

Conduit fill 40 percent

NEC Chapter 9 Table 1 permits a maximum conduit fill of 40 percent for three or more conductors, 31 percent for two, and 53 percent for one.

Working clearance 110.26

NEC 110.26 requires a workspace at least 30 inches wide, 3 feet deep, and 6.5 feet high in front of electrical equipment, with depth increasing at higher voltages.

GFCI protection

A GFCI detects a difference between hot and neutral currents and opens the circuit to reduce shock hazard; NEC Article 210 specifies required locations.

AFCI protection

An AFCI detects arcing faults in branch-circuit wiring and opens the circuit; NEC 210.12 specifies dwelling-unit branch circuits requiring AFCI protection.

Equipment grounding conductor

The EGC provides a low-impedance path for fault current back to the source, allowing overcurrent protection to clear faults and limiting voltage on metal parts.

Voltage drop formula

Single-phase voltage drop is VD = 2 x K x I x L / CM; three-phase voltage drop is VD = 1.732 x K x I x L / CM, where CM is circular mils.

Oregon Electrical Specialty Code

The OESC is Oregon's adopted electrical code, consisting of the current NFPA 70 with Oregon amendments, enforced by state and local electrical inspectors.

OESC amendments

Oregon amendments modify selected NEC provisions for Oregon installations; when an amendment conflicts with the NEC, the Oregon amendment controls.

OAR 918-305

OAR chapter 918, division 305 contains the Oregon Building Codes Division rules that adopt and amend the Oregon Electrical Specialty Code.

Electrical permit

An electrical permit authorizes covered electrical work and triggers inspection; it must be obtained before work begins unless a statutory exemption applies.

Electrical inspection

An electrical inspection verifies installed work complies with the OESC; concealment work must be inspected before being covered.

Licensed electrician requirement

Oregon law requires electrical work to be performed by a licensed electrician or an apprentice under proper supervision, with limited statutory exemptions.

ORS Chapter 479

ORS Chapter 479 is Oregon's Electrical Safety Law, covering electrician licensing, electrical permits, inspections, enforcement, and penalties for violations.

Oregon Building Codes Division

The Building Codes Division administers Oregon's building codes, issues electrician licenses, adopts the OESC, and oversees electrical permits and inspections.

General Journeyman license

An Oregon General Journeyman Electrician license authorizes the holder to perform electrical work under the statute and rules, excluding work reserved for supervising electricians.

Limited Residential license

An Oregon Limited Residential Electrician license authorizes electrical work on single-family and multifamily dwellings within limits set by statute and administrative rule.

Apprentice supervision

An Oregon electrical apprentice must work under supervision of a licensed electrician as required by statute and rule; supervision level depends on apprentice status.

Unlicensed electrical work

Performing electrical work without a required Oregon license can result in civil penalties, permit denial, stop-work orders, and required corrective action.

Ohm's law

Ohm's law states V = I x R, where V is voltage in volts, I is current in amperes, and R is resistance in ohms.

Single-phase power

Single-phase power in watts equals voltage times current times power factor: P = V x I x PF for an AC circuit.

Three-phase power

Three-phase power in watts equals 1.732 times line voltage times line current times power factor: P = 1.732 x V x I x PF.

Demand factor

A demand factor is the ratio of the maximum demand to the total connected load; it is applied to load calculations to size service and feeders.

General lighting load

NEC Table 220.12 assigns general lighting load in volt-amperes per square foot; dwelling units use 3 VA per square foot.

Conductor ampacity

Conductor ampacity is the maximum current a conductor can carry continuously under conditions of use without exceeding its temperature rating.

Lockout/tagout

Lockout/tagout isolates hazardous energy, applies locks and tags, and verifies de-energization before work on electrical equipment.

Test before touch

Test before touch means verifying a circuit is de-energized with a properly rated tester before contacting conductors or terminals.

Arc flash boundary

The arc flash boundary is the distance at which incident energy equals 1.2 calories per square centimeter; appropriate PPE is required inside it.

GFCI on construction sites

NEC 590.6 requires GFCI protection for temporary receptacles and cord sets on construction sites, with limited exceptions for assured equipment grounding programs.

Ladder 4-to-1 rule

For every 4 feet of working ladder height, the base should be set 1 foot from the wall, using the 4-to-1 setup ratio.

Energized work permit

An energized work permit documents justification, hazard analysis, PPE, and approval before work is performed on or near energized electrical conductors.