What is the primary purpose of NFPA 31?

The primary purpose of NFPA 31 is to govern safety standards specifically for oil-burning equipment. This standard outlines the requirements for the installation and maintenance of oil burners, ensuring that the systems operate safely and efficiently. NFPA 31 addresses various aspects, such as proper fuel handling, venting, and appliance installation, which are critical for preventing fires and ensuring overall safety in residential and commercial settings where oil-burning appliances are utilized.

The other options focus on different aspects of building and fire safety that NFPA 31 does not cover. For example, regulations regarding water usage or fire sprinkler systems are addressed in separate standards, while guidance on electrical installations falls under another set of codes. Thus, option B correctly identifies the core focus of NFPA 31, reaffirming its vital role in promoting safety in oil-burning equipment applications.