Oklahoma Natural Gas Journeyman

Equation 4-1 applies to gas pressures less than 1½ psi, while Equation 4-2 applies to pressures of 1½ psi and above.

Vertical ducts or direct outdoor communication require 1 sq in per 4,000 Btu/h per opening, while horizontal ducts require the larger ratio of 1 sq in per 2,000 Btu/h per opening.

MV-90 has a maximum operating temperature of 90°C, whereas MV-105 is rated for a higher maximum of 105°C.

Shielded or lead-covered conductors must not be bent to a radius less than 12 times the overall diameter, while nonshielded conductors require a minimum of only 8 times the overall diameter.

General direct-buried cables rated over 1 kV through 22 kV require 750 mm (30 in.) of cover, while cables in rigid metal conduit rated over 22 kV through 40 kV require only 150 mm (6 in.) of cover.

Ignition sources must be elevated at least 18 inches above the floor in hazardous/garage locations, but the entire appliance in a private garage must maintain a minimum clearance of 6 feet above the floor unless vehicle-impact protected.

Appliances in public garages or motor fuel-dispensing facilities must be installed not less than 8 feet above the floor, while appliances in private garages must be at least 6 feet above the floor (unless protected from vehicle impact).

A permit application is deemed abandoned after 180 days of filing without pursuit in good faith—not 90 days as commonly misassumed.

A grade-level appliance may rest on a concrete slab extending not less than 3 inches above adjoining grade, or alternatively be suspended not less than 6 inches above adjoining grade.

When combining spaces on the same story, each opening must provide at least 1 sq in per 1,000 Btu/h (minimum 100 sq in total free area), and regardless of method, no combustion air opening dimension shall be less than 3 inches.

A 'competent person' is defined by the ability to identify hazards and having authorization to correct them (no specific credential required), while only employees qualified by training or experience may operate equipment and machinery.

Gas piping may be interconnected within a single consumer's system, but where two or more meters supply separate consumers on the same premises, the piping systems shall not be interconnected on the outlet side of the meters.