NFPA 72: Heat-Sensing Fire Detectors Practice Flashcards

A set of vocabulary-style flashcards defining the technical classifications, standards, and spacing rules for heat-sensing fire detectors as outlined in Section 17.6.

Partial or Selective Coverage

Protection provided for selected areas only, as required by governing laws, codes, or standards, which must be protected in accordance with the Code.

Nonrequired Coverage

Detection installed for fire safety objectives but not mandated by law, which must meet Code requirements except for the prescriptive spacing criteria of Chapter 17.

UL 521

The applicable standard for Heat Detectors for Fire Protective Signaling Systems that heat-sensing fire detectors shall be listed in accordance with.

Response Time Index (RTI)

A sensitivity metric that spot-type heat detectors must include in their installation instructions, technical data, and listing documentation.

Low Temperature Classification

Heat detectors with a temperature rating range of $100-134\,^{\circ}F$ ($38-56\,^{\circ}C$) and a maximum ceiling temperature of $80\,^{\circ}F$ ($28\,^{\circ}C$).

Ordinary Temperature Classification

Heat detectors with a temperature rating range of $135-174\,^{\circ}F$ ($57-79\,^{\circ}C$) and a maximum ceiling temperature of $115\,^{\circ}F$ ($47\,^{\circ}C$).

Intermediate Temperature Classification

Heat detectors with a temperature rating range of $175-249\,^{\circ}F$ ($80-121\,^{\circ}C$) and a White color code.

High Temperature Classification

Heat detectors with a temperature rating range of $250-324\,^{\circ}F$ ($122-162\,^{\circ}C$) and a Blue color code.

Extra High Temperature Classification

Heat detectors with a temperature rating range of $325-399\,^{\circ}F$ ($163-204\,^{\circ}C$) and a Red color code.

Very Extra High Temperature Classification

Heat detectors with a temperature rating range of $400-499\,^{\circ}F$ ($205-259\,^{\circ}C$) and a Green color code.

Ultra High Temperature Classification

Heat detectors with a temperature rating range of $500-575\,^{\circ}F$ ($260-302\,^{\circ}C$) and an Orange color code.

Ambient Ceiling Temperature Buffer

The requirement that the temperature rating of a detector be at least $20\,^{\circ}F$ ($11\,^{\circ}C$) above the maximum expected temperature at the ceiling.

Smooth Ceiling 0.7 Rule

The design requirement that all points on a ceiling shall have a detector within a distance equal to or less than $0.7 \times S$, where $S$ is the listed spacing.

Irregular Area Spacing

A provision allowing spacing between detectors to exceed the listed spacing as long as the maximum distance to the farthest point of a sidewall or corner is not greater than $0.7$ times the listed spacing.