By order of the publisher, historical UL documents are not returnable for any reason. Once you place an order for an historical document, we cannot issue a refund, credit, or exchange of any kind.
These requirements cover electrical control units and accessories for fire-protective signaling systems to be emplo yed in ordinary indoor locations in accordance with the following Standards of the National Fire Protection Association:

NFPA 12

Carbon Dioxide Extinguishing Systems

NFPA 12A

Halogenated Extinguishing Agent Systems,

Halon 1301

NFPA 12B

Halogenated Extinguishing Agent Systems,

Halon 1211

NFPA 70