Los Angeles County Municipal Code § 510.4 Fire Code

The building shall be considered to have acceptable in-building, two-way emergency responder communication system coverage where signal strength measurements in 95 percent of all areas on each floor of the building, and 99 percent of each critical area as designated below, meet the signal strength requirements in Sections 510.4.1.1 through 510.4.1.3. Critical areas shall include the following:

At all fire alarm control panels.

At fire fighter's smoke control panels.

At the main electrical panel(s).

Throughout emergency and standby power rooms.

Throughout a fire command center complying with Section 508.

Throughout exit stairs.

Throughout areas of refuge.

Throughout fire pump rooms.

Throughout elevator machine rooms and elevator lobbies.

Throughout building lobbies.

Locations as determined by the fire code official.

The minimum inbound signal strength shall be sufficient to provide usable voice communications throughout the coverage area as specified by the fire code official. The inbound signal level shall be a minimum of -95dBm throughout the coverage area and sufficient to provide not less than a Delivered Audio Quality (DAQ) of 3.4 or an equivalent Signal-to-Interference- Plus-Noise Ratio (SINR) applicable to the technology for either analog or digital signals.

The minimum outbound signal strength shall be sufficient to provide usable voice communications throughout the coverage area as specified by the fire code official. The outbound signal level shall be sufficient to provide not less than a DAQ of 3.4 or an equivalent SINR applicable to the technology for either analog or digital signals.

The in-building, two-way emergency responder communication coverage system shall be designed in accordance with Sections 510.4.2.1 through 510.4.2.8, in accordance with NFPA 1221, and as determined by the fire code official.

In-building, two-way emergency responder communication coverage systems shall be provided with dedicated standby batteries or provided with 12-hour standby batteries and connected to the facility generator power system in accordance with Section 1203. The standby power supply shall be capable of operating the in-building, two-way emergency responder communication coverage system at 100-percent system capacity for a duration of not less than 24 hours.