Regarding for Class A Wood cribs Extinguishing test in UL 2775 sec. 49.2 (or NFPA 2010)
The UL 2775 test method is very different with UL 2166 or 2127 (Halocarbon Clean Agent or Inert Gas Extinguishing Systems), wood crib size, ignition fuel, pre-burning time and etc.....
If it's because of characteristics of each agent system,
Then Is there any difference between fire detection criteria of two systems, installation location, or protection object
(for example, specific detectors for early detection or fast reponse as well as Heat and smoke detector)