Outdoor combustion air shall be provided through openings not less than 3 inches. Attics and crawl spaces are an acceptable source of combustion air when they are vented by mechanical means.

Arc-resistant-jacketed CSST is considered bonded when it is connected to an appliance that is properly grounded..

The voltmeter will have to be connected to the circuit or load in _________ in order to determine the applied voltage or voltage drop of the loads in the circuit.

A _________________ type flame sensor is a device that will generate a small voltage when heated.

Which electrical failure would correspond to the following Ohmmeter readings?Common, Start, Common and Run terminals to compressor case = 0 Ohms

How does the amount of excess combustion air affect the percentage of carbon dioxide measured in the flue gas?

Liquidtight flexible non-metal conduit shall be securely fastened and supported:

Truss members shall not be cut, drilled, spliced or notched or altered without the written approval of a registered design professional.

Modern oil burners have a primary control that uses which of the following methods to prove burner ignition?

Offsets for type B and L vent greater than 45 degrees from vertical is considered horizontal