1 These requirements cover component fuel cell modules for building into equipment, including portable and stationary fuel cell applications. 2. These requirements also cover proton exchange membrane (PEM), alkaline, phosphoric acid, molten carbonate, solid oxide type fuel cell modules that are intended to be factory installed in complete products. 3. These requirements do not cover removable fuel cartridges for refueling the fuel cell module. This is the second issue of the Outline of Investigation for Fuel Cell Modules for Use in Portable and Stationary Equipment. Note that the first issue of the outline was named Portable Proton Exchange Membrane (PEM) Type Fuel Cell Power Plants With Or Without Uninterruptable Power Supply (UPS) Features And Portable Proton Exchange Membrane (PEM) Type Fuel Cell Modules For Factory Installation In Original Equipment Manufacturer (OEM) Type Equipment For Indoor Use