CSLB Class B General Contractor's License Practice Exam

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Prepare for the CSLB Class B General Contractor's License Test with interactive flashcards and multiple choice questions. Each question offers hints and explanations to enhance your understanding and readiness for the exam.

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A water heater pilot light should be at a minimum height of how many inches from the ground?

The correct answer is: 18

The minimum height requirement for a water heater pilot light is set at 18 inches from the ground primarily due to safety considerations. This standard is intended to reduce the risk of ignition from flammable vapors that can accumulate near the floor level. Many household substances, including gasoline and certain solvents, can emit vapors that are heavier than air, which tend to settle near the ground. By positioning the pilot light at a height of 18 inches or higher, the risk of these vapors reaching the flame of the pilot light is minimized, thus enhancing safety in the area where the water heater is installed. This height requirement is part of the plumbing and gas installation codes, which are designed to promote safe operation and reduce fire hazards in residential and commercial settings. The other options propose heights that do not align with these safety standards or are higher than necessary, making 18 inches the most appropriate choice for effective safety measures concerning pilot lights in water heaters.