Oregon Low Voltage Practice flashcards

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

Limited Energy Technician Class A

Oregon certificate allowing installation, alteration, and repair of all limited energy systems, including fire alarm and nurse call, under a licensed electrical contractor.

Limited Energy Technician Class B

Oregon certificate limited to specified limited energy systems such as HVAC controls; fire alarm and nurse call work require additional qualification beyond Class B.

Electrical contractor license

Oregon business license required for any entity offering or performing electrical work; it is separate from the individual electrician or technician certificate.

Supervising technician designation

The individual limited energy technician or electrician named on a contractor license as responsible for the work; changes must be reported to the Building Codes Division.

Electrical permit requirement

Oregon requires a permit before electrical work begins, obtained from the local building department or Building Codes Division, with inspections at specified stages.

OAR 918-282 scope

Oregon administrative rule division defining limited energy electrical activity, including system types, power limits, and the Class A and Class B technician scopes.

Statewide code uniformity

Oregon adopts the NEC with state amendments through the Electrical Specialty Code; local jurisdictions may not adopt conflicting electrical requirements.

OAR 918-311 coverage

Oregon rule division governing electrical inspections and permits, including minor work allowances and the process for requesting inspection.

Branch circuit definition

NEC Article 100 defines it as the circuit conductors between the final overcurrent device protecting the circuit and the outlet or outlets.

Working clearance 110.26

Requires at least 36 inches depth, width of equipment or 30 inches, and 6 feet 6 inches headroom in front of electrical equipment.

Conductor ampacity adjustment

Table 310.16 ampacity must be corrected for ambient temperature and adjusted for more than three current-carrying conductors in a raceway or cable.

Box fill calculation

Table 314.16(A) assigns volume allowances per conductor, device, and grounding conductor; total allowance must not exceed the box volume.

Plenum cable requirement

NEC 300.22 requires plenum-rated cable such as CMP, FPLP, or CL3P in environmental air spaces; riser-rated cable is used in vertical shafts.

Abandoned cable removal

Accessible portions of abandoned limited energy cable must be removed unless identified for future use, per Article 800 and related sections.

Article 760 fire alarm cable

Power-limited fire alarm circuits use FPL, FPLR, or FPLP cable; non-power-limited circuits use NPLF cable with stricter separation requirements.

Limited energy separation

Class 2, Class 3, and communications cables must be separated from power conductors by a barrier or spacing unless a listed exception applies.

Equipment grounding conductor sizing

Table 250.122 sizes the equipment grounding conductor based on the rating of the overcurrent device protecting the circuit.

Bonding versus grounding

Bonding connects metal parts to ensure electrical continuity; grounding connects the system to earth. Article 250 treats them as distinct requirements.

Listed Class 2 power supply

A supply listed to limit output voltage and current so the circuit cannot deliver hazardous energy, permitting reduced wiring and protection requirements.

Short-circuit current rating

Equipment must have a short-circuit current rating equal to or greater than the available fault current at its terminals per NEC 110.9 and 110.10.

NFPA 72 supervision

Fire alarm initiating and notification circuits must be supervised to detect opens, grounds, and shorts unless a specific code exception applies.

Smoke detector spacing

NFPA 72 Chapter 17 spacing depends on ceiling height, ceiling configuration, and air movement rather than a single fixed distance.

Fire alarm panel listing

The control panel must be listed for the purpose and installed per manufacturer instructions; unlisted field modifications may void the listing and system approval.

Communication circuit protection

Article 800 requires primary protectors and other safeguards where communications circuits are exposed to outside plant and enter a building.

Class 2 versus Class 3

Article 725 distinguishes them by power source limits in Table 725.121; Class 2 has lower limits and permits less physical protection than Class 3.

CL3P cable marking

The P suffix indicates plenum rating for Class 3 cable; the R suffix indicates riser rating, and the marking must match the installed environment.

Class 2 circuit separation

Class 2 and Class 3 circuits must be separated from power and Class 1 circuits by a permanent barrier or spacing per NEC 725.136.

Power-limited circuit listing

The listing of the Class 2 or Class 3 power supply is the basis for reduced wiring requirements because it limits available output energy.

Arc flash risk assessment

NFPA 70E requires assessing incident energy or arc flash PPE category to select PPE appropriate for the working distance and task.

Energized work permit

NFPA 70E 130.2 permits energized work only when de-energization is infeasible, and then only with an energized electrical work permit and PPE.

Test instrument CAT rating

CAT III applies to distribution-level circuits, CAT IV to service entrance, and CAT II to branch circuits and plug-connected loads; the rating must match the circuit.

Approach boundaries

Limited, restricted, and arc flash boundaries limit access; only qualified persons may cross the limited approach boundary, with more justification for the restricted boundary.