Los Angeles County Municipal Code § 510.5 Installation requirements

The installation of the in-building, two-way emergency responder communication coverage system shall be in accordance with NFPA 1221, in accordance with Sections 510.5.1 through 510.5.5, and as determined by the fire code official.

To maintain proper alignment with the system designed donor site, donor antennas shall be permanently affixed on the building. For existing installations where an antenna was previously approved to be mounted on a movable sled, the assembly shall be provided with an approved, clearly visible sign stating "MOVEMENT OR REPOSITIONING OF THIS ANTENNA IS PROHIBITED WITHOUT APPROVAL FROM THE FIRE CODE OFFICIAL." The antenna installation shall be in accordance with the applicable requirements in the California Building Code for weather protection of the building envelope.

Where an in-building, two-way emergency responder communication coverage system is required, and upon completion of installation, the building owner shall have the radio system tested to verify that two-way coverage on each floor of the building is not less than 95 percent, and 99 percent for critical areas as defined in Section 510.4.1. The test procedure shall be conducted as follows:

For the 95-percent coverage test, each floor of the building shall be divided into a grid of 20 approximately equal test areas. Floors or levels of exceptionally large size may be required to be considered in sections in order to keep the individual grid test areas of reasonable size. For the critical-areas coverage test, those areas shall be identified and shall require 99-percent coverage.

The test shall be conducted using a calibrated portable radio of the latest brand and model used by the agency talking through the agency's radio communications system or equipment approved by the fire code official.

Failure of more than one test area shall result in failure of the test. No failure of critical areas will be allowed.

For the 95-percent coverage requirement areas, in the event that two of the test areas fail the test, in order to be more statistically accurate, the floor shall be permitted to be divided into 40 equal test areas. Failure of not more than two nonadjacent test areas shall not result in failure of the test. If the system fails the 40-area test, the system shall be altered to meet the 95-percent coverage requirement.

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