OR Electrician cheat sheet

NEC Article 90 states the code purpose and scope; Chapters 1-4 apply generally, Chapter 5 covers special occupancies, Chapter 6 special equipment, Chapter 7 special conditions, and Chapter 8 communications systems.

NEC 210.8 requires GFCI protection for specified receptacle outlets in dwelling units, including bathrooms, kitchens, garages, outdoors, and unfinished basements, subject to the edition's exact list.

NEC 210.12 requires AFCI protection for specified dwelling-unit branch circuits, including bedrooms, living areas, and other rooms listed in the section.

Box fill under NEC 314.16 counts conductors, clamps, devices, and equipment grounding conductors, then applies the volume allowance from Table 314.16(B).

NEC Chapter 9 Table 1 limits conduit fill to 53 percent for one conductor, 31 percent for two conductors, and 40 percent for three or more conductors.

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

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

NEC Article 250 covers grounding and bonding, including the equipment grounding conductor, grounding electrode system, and bonding of metal parts.

The Oregon Electrical Specialty Code is Oregon's adopted electrical code and consists of the current NFPA 70 plus Oregon-specific amendments.

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

When an Oregon amendment conflicts with the NEC text, the Oregon amendment governs the installation.

The OESC applies to new construction, alterations, and repairs of electrical installations in Oregon, subject to statutory exemptions.

An electrical permit is required before covered electrical work begins, and concealment work must be inspected before it is covered.

Electrical work must be performed by a licensed electrician or by an apprentice under the supervision required by Oregon statute and rule.

The OESC is enforced statewide by electrical inspectors through permits, inspections, and code compliance orders.

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

OAR chapter 918 contains the Building Codes Division administrative rules that implement ORS Chapter 479 and the electrical code.

The Oregon Building Codes Division issues electrician licenses and administers the state electrical code program.

Oregon license categories include General Journeyman, General Supervising, Limited Residential, Limited Maintenance, Limited Renewable Energy Technician, Limited Sign, Limited Pump Installation, and Apprentice.

A licensed electrician or properly supervised apprentice must perform electrical work unless a specific statutory exemption applies.

Electrical inspectors may require correction of noncompliant work and may issue stop-work orders or other enforcement actions.

Violations of Oregon electrical licensing or permit requirements can result in civil penalties and required corrective work.

Ohm's law: V = I x R, where V is volts, I is amperes, and R is ohms.

Power formulas: P = V x I for DC or unity power factor; P = V x I x PF for single-phase AC; P = 1.732 x V x I x PF for three-phase AC.

In a balanced wye system, line voltage equals 1.732 times phase voltage, and line current equals phase current.

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

A demand factor is the ratio of maximum demand to total connected load and is applied to calculate service and feeder loads.

Conductor ampacity must be adjusted for ambient temperature and conductor count and must be at least the calculated load after adjustment.

Voltage drop is calculated with VD = 2 x K x I x L / CM for single-phase circuits and VD = 1.732 x K x I x L / CM for three-phase circuits.

Box fill is calculated by counting conductors, clamps, devices, and equipment grounding conductors and applying NEC Table 314.16(B) volume allowances.

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

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

NFPA 70E establishes arc flash and shock risk assessment requirements, including the arc flash boundary and required PPE.

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

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

The 4-to-1 ladder rule sets the base 1 foot from the wall for every 4 feet of working ladder height.

Energized electrical work requires a documented permit, justification, hazard analysis, PPE selection, and approval before work begins.

Temporary wiring must be protected from physical damage and must use listed cords, connectors, and grounding connections suitable for the environment.