this is from 2007 nfpa13
seems like if you need it for dry pipe and pre action you need it for all
for dry pipe::
7.2.5* Location and Protection of Dry Pipe Valve.
7.2.5.1* General. The dry pipe valve and supply pipe shall be protected against freezing and mechanical injury.
7.2.5.2 Valve Rooms.
7.2.5.2.1 Valve rooms shall be lighted and heated.
7.2.5.2.2 The source of heat shall be of a permanently installed type.
7.2.5.2.3 Heat tape shall not be used in lieu of heated valve enclosures to protect the dry pipe valve and supply pipe against freezing.
7.2.5.3 Supply. The supply for the sprinkler in the dry pipe valve enclosure shall be from the dry side of the system.
covers pre action and deluge:
7.3.1.8 Location and Protection of System Water Control Valves.
7.3.1.8.1 System water control valves and supply pipes shall be protected against freezing and mechanical injury.
7.3.1.8.2 Valve Rooms.
7.3.1.8.2.1 Valve rooms shall be lighted and heated.
7.3.1.8.2.2 The source of heat shall be of a permanently installed type.
7.3.1.8.2.3 Heat tape shall not be used in lieu of heated valve enclosure rooms to protect preaction and deluge valves and supply pipe against freezing.
then there is this section:
8.16.4 Protection of Piping.
8.16.4.1 Protection of Piping Against Freezing.
8.16.4.1.1 Unless the requirements of 8.16.4.1.2 are met, where portions of systems are subject to freezing and temperatures cannot reliably be maintained at or above 40°F (4°C), sprinklers shall be installed as a dry pipe or preaction system.
8.16.4.1.2 Small unheated areas are permitted to be protected by antifreeze systems or by other systems specifically listed for this purpose, including but not limited to listed heat tracing systems.
8.16.4.1.3 Where aboveground water-filled supply pipes, risers, system risers, or feed mains pass through open areas, cold rooms, passageways, or other areas exposed to temperatures below 40°F (4°C), the pipe shall be protected against freezing by insulating coverings, frostproof casings, listed heat tracing systems, or other reliable means capable of maintaining a minimum temperature between 40°F (4°C) and 120°F (48.9°C).
8.16.4.1.4 Where listed heat tracing systems are used, they shall be supervised.
8.16.4.1.5 Where listed heat tracing is utilized for branch lines, it shall be specifically listed for use on branch lines.