What compliance standard must electric installations at CNG facilities meet?

The correct answer emphasizes that electric installations at Compressed Natural Gas (CNG) facilities must adhere to specific codes that ensure safety and effectiveness in handling flammable gases. The American National Standards Institute (ANSI) and the National Fire Protection Association (NFPA) have established guidelines for hazardous locations, which include classifications of areas where flammable gases may be present.

Class one, group D, Division II specifically pertains to areas where flammable gases or vapors are not normally present in the air in sufficient quantities to produce explosive or ignitable mixtures. This means that equipment located in these environments must be designed to prevent ignition under normal operating conditions. By complying with this standard, CNG facilities ensure that their installations minimize the risks associated with potential gas leaks or electrical faults.

In contrast, while the National Electric Code provides general electrical safety standards, it does not specifically target the requirements for installations in hazardous locations like CNG facilities. Similarly, OSHA regulations primarily focus on worker safety and health standards rather than detailed electrical specifications. Environmental Protection Guidelines also do not directly pertain to the design and compliance standards for electrical installations in hazardous environments. Thus, the requirement to follow Class one, group D, Division II requirements demonstrates a necessary focus on safety in specific operational contexts associated with