1.1.1 This Standard applies to ac and dc
type portable fuel cell power systems, with a rated output voltage not
exceeding 600 V, for commercial, industrial, and residential indoor and
outdoor use in non-hazardous locations, in accordance with the Rules of the
National Electric Code, ANSI/NFPA 70.
1.1.2 This Standard does not apply to portable fuel cell
power systems that are
a. Permanently connected (stationary) to either fuel or
electric supply; b. Designed to export power to the grid; c. Replacement fuel
cell power units for appliances; or d. Fuel cell systems for propulsion.
1.1.3 Fuels considered within the scope of this standard
are: a. Natural Gas; b. Liquefied Petroleum / Propane Gases; c. Liquid Alcohols
e.g. Methanol, Ethanol; d. Gasoline; e. Diesel; f. Kerosene; g. Hydrogen; h.
Chemical Hydrides; and i. Metallic.
1.1.4 The overall design of a portable fuel cell power
system anticipated by this standard shall form an assembly of integrated
systems, as necessary, intended to perform designated functions, as follows:
a. Fuel Processing System - meters and processes incoming fuel supply for use
within the portable fuel cell power system. b. Air Processing System -
meters, conditions, processes and may pressurize (blowers or turbochargers)
incoming air supply for use within the portable fuel cell power system. c.
Thermal Management System - provides cooling and heat rejection to maintain
thermal equilibrium within the portable fuel cell power system and may
provide for recovery of excess heat and assist in heating the portable fuel
cell power system during startup. d. Electrical System - conditions output
power of the fuel cell to meet the specifications of the output system. e.
Automatic Control System - the assembly of sensors, actuators valves,
switches, and control logic components that maintains the portable fuel cell
power system control parameters within manufacturer specified limits without
manual intervention. f. Fuel Cell Module - an assembly of cells, separators
and cooling plates, manifolds and a supporting structure that
electrochemically converts fuel and oxidant to direct electrical current,
heat, water and other byproducts.
1.1.5 These requirements are not intended to prevent the
design and construction of a portable fuel cell power system not specifically
prescribed in this standard, provided that such alternative has been
considered in testing and listing the portable fuel cell power system. In
considering alternative designs or construction the materials or methods used
shall be evaluated as to their ability to yield equivalent performance to
that prescribed by this standard.