According to Article 504 of the National Electrical Code, NFPA 70, an intrinsically safe electrical circuit is defined as one in which no spark or thermal effect generated during normal functioning and/or during specific fault conditions is able to ignite a given explosive atmosphere.
This is a federal standard only. Such a vehicle meets EPA CFV ILEV exhaust emission standards and produces very few or no evaporative emissions (5 grams or less per test without using auxiliary emission control devices). ILEVS are dedicated AFVs in most cases. Dual-fuel vehicles will be considered ILEVs only if both fuels meet the standard. ILEV credits can be banked in the Consolidated Metropolitan Statistical Area.
In transportation, this term generally refers to the charging and fueling network necessary to successful development, production, commercialization, and operation of alternative fuel vehicles. It includes fuel supply, public and private charging and fueling facilities, standard specifications for fueling outlets, customer service, education and training, and building code regulations.