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B52 EXAM QUESTIONS AND
ACTUAL ANSWERS
Q: What does the scope not directly address? - ANSWER The scope does not directly address the protection of property or the preservation of the environment.
Q: What code governs boilers, pressure vessels, and pressure piping in Alberta? - ANSWER The governing code is ABSA, with the reference being B51.
Q: What is the C22 code? - ANSWER C22 is the electrical code book.
Q: What is the B149 code? - ANSWER B149 is the gas and propane code book.
Q: What does the American Conference of Governmental Industrial Hygienists (ACGIH) publish annually? - ANSWER The ACGIH publishes the Annual Manual of Threshold Limit Values.
Q: What does ASHRAE stand for? - ANSWER ASHRAE stands for the American Society of Heating, Refrigeration and Air-Conditioning Engineers.
Q: What does IDLH stand for, and what does it represent? - ANSWER IDLH stands for "Immediately Dangerous to Life or Health" and represents the maximum concentration of a substance from which one can escape within 30 minutes without experiencing escape-impairing symptoms or irreversible health effects.
Q: What does LFL stand for, and what does it represent? - ANSWER LFL stands for "Lower Flammability Limit" and represents the minimum concentration of a refrigerant capable of propagating a flame through a homogeneous mixture of refrigerant and air.
Q: What does TLV/TWA stand for, and what does it represent? - ANSWER TLV/TWA stands for "Threshold Limit Value/Time-Weighted Average" and represents the refrigerant concentration in air during a normal 8-hour workday and 40-hour workweek, to which nearly all workers can be exposed every day without adverse effects.
Q: What is a stop valve? - ANSWER A stop valve is a device used to shut off the flow of refrigerant.
Q: What is a pressure limiting device? - ANSWER A pressure limiting device is a pressure-responsive mechanism designed to automatically stop the operation of the pressure-imposing element at a predetermined pressure.
Q: What is a pressure-relief device? - ANSWER A pressure-relief device is a pressure-actuated valve or rupture member designed to automatically relieve pressure exceeding its setting.
Q: What is the institutional occupancy classification, and what does it include? -
ANSWER The institutional occupancy classification applies to portions of premises where persons are confined to receive medical care or treatment or are held or detained by reason of public or civic duty. It includes hospitals, correctional facilities, police stations, and courthouses with cells.
Q: What is included in the public assembly occupancy classification? - ANSWER Schools fall under the public assembly occupancy classification.
Q: What is the residential occupancy classification? - ANSWER The residential occupancy classification applies to portions of a building where sleeping accommodations are provided.
Q: What is the commercial occupancy classification? - ANSWER The commercial occupancy classification applies to portions of a premises used for transacting business, including restaurants and stores.
Q: What is the industrial occupancy classification, and what does it include? - ANSWER The industrial occupancy classification applies to an entire building or premises, or to portions of a building used for manufacturing, processing, or storage of materials or products. It includes ice-making plants.
Q: What is the mixed occupancy classification? - ANSWER The mixed occupancy classification applies to a building in which different parts are occupied or used for different purposes.
Q: What governs equipment located less than 6.1 m (20 ft.) from a building opening? - ANSWER Equipment, other than piping, located less than 6.1 m (20 ft.) from any building opening shall be governed by the occupancy classification of the building.
Q: How is refrigerant toxicity classified? - ANSWER Refrigerant toxicity is classified as A and B, with A being lower toxicity and B being higher toxicity.
Q: How is refrigerant flammability classified? - ANSWER Refrigerant flammability is classified by 1, 2, and 3, where 1 indicates no flame propagation, 2 indicates lower flammability, and 3 indicates higher flammability.
Q: What is A2L in refrigerant classification? - ANSWER A2L is a new classification for refrigerants that have lower toxicity (A) and lower flammability (2L).
Q: Where is it prohibited to install any portion of a refrigeration system? - ANSWER In addition to the requirements specified in Clause 4.5, no portion of a refrigeration system shall be installed in or on a public stairway, stair landing, or exit.
Q: What additional restriction applies to the installation of refrigeration systems? - ANSWER In addition to the requirements specified in Clause 4.5, no portion of a refrigeration system shall interfere with free passage through a public hallway or lobby.
Q: What material is prohibited from being used in contact with halogenated refrigerants? - ANSWER Magnesium alloys shall not be used in contact with halogenated
Q: What is the fire-resistive construction requirement for a machinery room? - ANSWER The machinery room shall have not less than one-hour fire-resistive construction.
Q: What are the requirements for machinery rooms using refrigerants of groups A2, A3, B2 (other than ammonia), and B3? - ANSWER When refrigerants of groups A2, A3, B (other than ammonia), and B3 are used, the machinery room shall conform to the requirements for Class 1, Zone 2 locations as defined in the Canadian Electrical Code, Part 1.
Q: What are the restrictions on refrigerant piping placement? - ANSWER Passages shall not be obstructed by refrigerant piping. Refrigerant piping shall not be placed in any elevator, dumbwaiter, or other shaft containing a moving object.
Q: When are pressure limiting devices required, and what is the exception? - ANSWER Pressure limiting devices shall be provided on all systems operating above atmospheric pressure, except that a pressure limiting device may be omitted on a factory-sealed system that contains less than 10 kg (22 lbs) of Group A1 refrigerant and has been listed by an approved testing laboratory.
Q: How should pressure limiting devices be connected? - ANSWER Pressure limiting devices shall be connected with no intervening stop valves.
Q: What is required for systems operating over 103 kPa (15 psig) with large quantities of refrigerant? - ANSWER Systems designed for operation over 103 kPa (15 psig) and containing 182 kg (400 lbs) or more of Group A1 refrigerant or 91 kg (200 lbs) or more of all other refrigerants shall be constructed so that, in an emergency, the refrigerant can be safely and rapidly discharged into the atmosphere.
Q: What are the requirements for the installation of an emergency valve? - ANSWER The emergency valve shall be installed in a glass-fronted box painted bright red and placed outside the building in a location where it cannot be operated by anyone other than the plant operator, a firefighter, or a person authorized to open the valve in an emergency. The valve shall be located at least 2.3 m (7 ft) above grade, except as permitted by the regulatory authority
If Alberta strays from the B52 national code, then it must be more strict. - ANSWER True.
What classification of occupancy are hockey arenas? - ANSWER Mixed.
What is the fire resistance requirement for the wall that separates two zones? - ANSWER The wall needs to have a 1-hour fire barrier.
What are 404A and 410A classified as? - ANSWER Both are classified as A- refrigerants.
What is 290 classified as, and where can it be used? - ANSWER Propane, classified as A-3. It can be used in public spaces (used to be limited to 8 oz).
What is 717, and what is its classification? - ANSWER NH3 (ammonia), classified as B-2.
It is the best refrigerant for subzero applications.
What is 718, and why is it notable? - ANSWER Water, the best refrigerant known to man.
What is 744, and what is its classification? - ANSWER CO2, classified as A-1. It is the second-best refrigerant for subzero applications.
Can you have copper windings and bronze bearings in an ammonia compressor? - ANSWER Yes, as long as they don't come in contact with the ammonia.
What is the difference between copper tubing K and L? - ANSWER K is thicker because it's "King." L is thinner because it's for "Losers."
Can you install soft copper above 1 3/8" if it is unprotected (outside of the unit)? - ANSWER No.
Can you use wood as supports for a condenser? - ANSWER No.
Machinery rooms should allow for free access to all equipment. True or False? - ANSWER True.
Should a refrigerant leak detector be located in the most likely place where a leak might occur? - ANSWER Yes, but not for ammonia.
What are pressure relief valves rated in for refrigerants? - ANSWER Pounds of dry air per minute.
