Massachusetts Low Voltage Practice flashcards
Massachusetts Low Voltage Practice · Build recall with a focused review session.
32 cards. Read the term and the definition here. The deck at the top of this page is optional.
- Massachusetts Electrical Code
- The Massachusetts Electrical Code is 527 CMR 12.00, which adopts NFPA 70 with state amendments and is enforced by local wiring inspectors.
- Systems Technician license
- A Massachusetts license authorizing low-voltage system work under the supervision of a licensed Systems Contractor; it does not authorize general electrical contracting.
- Systems Contractor license
- A Massachusetts license that authorizes contracting for low-voltage systems within Board scope; the contractor is responsible for permits and code compliance.
- Board of State Examiners
- The Massachusetts board within the Division of Professional Licensure that issues electrician and systems licenses and enforces licensing discipline.
- Listed
- Equipment or material evaluated by a nationally recognized testing laboratory and found suitable for a specific purpose; the listing is the basis for NEC acceptance.
- Branch circuit
- The circuit conductors between the final overcurrent device protecting the circuit and the outlet or outlets served.
- Working clearance
- NEC 110.26 requires at least 3 ft depth, 30 in width, and 6.5 ft height in front of electrical equipment, with depth increasing by voltage.
- Box fill calculation
- NEC 314.16 assigns cubic-inch volumes to conductors, clamps, devices, and grounds; the total must not exceed the box volume marked.
- Class 2 circuit
- A remote-control or signaling circuit supplied by a listed Class 2 power source and limited in power under NEC Article 725.
- Class 3 circuit
- A remote-control or signaling circuit supplied by a listed Class 3 power source; it has higher allowable power than Class 2 but remains Article 725 limited.
- CL3P cable
- A Class 3 plenum-rated cable marked for use in environmental air spaces; it has low smoke and flame spread characteristics required by Article 725.
- Class 1 circuit
- A remote-control or signaling circuit that is not Class 2 or 3; it is wired with Chapter 3 methods and protected against overcurrent.
- FPLP cable
- Fire alarm power-limited plenum cable, marked for environmental air spaces and permitted for power-limited fire alarm circuits under NEC Article 760.
- Class A pathway
- A fire alarm signaling pathway that survives a single open or ground fault and continues to operate; NFPA 72 defines performance.
- Manual pull station
- A manually operated initiating device; NFPA 72 generally requires it within 5 ft of an exit door along the path of egress.
- Public mode audibility
- NFPA 72 public-mode notification requires 75 dBA at 10 ft from the appliance and 15 dBA above average ambient, unless occupancy-specific rules differ.
- CMP cable
- Communications plenum cable rated for environmental air spaces under NEC Article 800; it limits smoke and flame spread and is required in plenums.
- Primary protector
- A listed device at the building entrance that limits surge voltage on communications circuits and is bonded to the grounding electrode system.
- CATVP cable
- Community antenna television plenum cable rated for environmental air spaces under NEC Article 820; it is used for coaxial broadband cabling.
- 2-inch separation
- NEC Article 800 generally requires communications cables to maintain at least 2 in of separation from power conductors, unless a permitted exception applies.
- OFNP cable
- Optical fiber nonconductive plenum cable rated for environmental air spaces; it has no metallic conductors and meets low smoke requirements.
- OFCR cable
- Optical fiber conductive riser cable; it contains metallic members and is rated for vertical riser installations under NEC Article 770.
- Fiber bend radius
- The minimum curve radius a fiber cable can tolerate; exceeding it causes microbending and signal attenuation, so manufacturer ratings control installation.
- CMP network cable
- Plenum-rated communications cable used for data networks in air-handling spaces; Article 800 requires CMP where environmental air is circulated.
- Equipment grounding conductor
- A conductor that connects non-current-carrying metal parts to the grounding system to clear faults and provide a low-impedance path.
- Bonding jumper
- A listed conductor that ensures electrical continuity between metal parts that must be electrically connected, such as raceways, enclosures, and electrodes.
- Grounding electrode system
- The set of electrodes, such as ground rods, water pipe, and building steel, bonded together per NEC 250.50 to establish a common ground reference.
- Overcurrent device
- A fuse or circuit breaker that opens a circuit when current exceeds its rating, protecting conductors from overheating per NEC Article 240.
- Lockout/tagout
- An OSHA-required procedure that isolates hazardous energy, applies locks and tags, and verifies de-energization before work begins.
- CAT III meter
- A test instrument rating for distribution-level circuits; it provides transient protection suitable for panelboards and feeders, not just receptacles.
- Firestop system
- A listed assembly of materials that restores the fire-resistance rating of a wall or floor penetration, tested to ASTM E814 or UL 1479.
- 4-to-1 ladder rule
- For every 4 ft of working height, the ladder base is set 1 ft out from the wall, with the ladder extending 3 ft above the landing.