Section 17-400. REQUIREMENTS FOR LICENSED OPERATORS

 

400.1The operation and maintenance of the following equipment shall be exempt from the requirement of having licensed operating engineers:

 

(a)Vehicles operated under the regulations of the D.C. Public Service Commission or the U.S. Interstate Commerce Commission;

 

(b)Machinery on boats or vessels operated under the regulations of the United States Coast Guard;

 

(c)Automotive vehicles used solely for traction purposes;

 

(d)Packaged, self-contained air conditioning units;

 

(e)Automatically operated air conditioning systems with non-toxic and non-inflammable refrigerant and not over a total of one hundred twenty-five (125) compressor horsepower, where no one refrigerant circuit is in excess of seventy-five (75) horsepower;

 

(f)Automatically operated air conditioning systems using the heat absorption cycle with a non-toxic and non-inflammable refrigerant and not over a total of one hundred twenty-five (125) tons of refrigeration, where no one refrigerant circuit is in excess of seventy-five (75) tons, except where a boiler of a type and capacity that requires a licensed engineer is used;

 

(g)Cold storage and refrigeration systems using non-toxic and non-inflammable refrigerant not in excess of seventy-five (75) compressor horsepower;

 

(h)Cold storage and refrigeration systems using the heat absorption cycle with a non-toxic and non-inflammable refrigerant not in excess of forty (40) tons;

 

(i)Cold storage and refrigeration systems using toxic or inflammable refrigerant not in excess of five (5) compressor horsepower;

 

(j)Cold storage and refrigeration systems using the heat absorption cycle with a toxic or inflammable refrigerant not in excess of three (3) tons;

 

(k)Automatically operated pumping stations;

 

(l)Hot water heating boilers where the total boiler horsepower is not in excess of seventy-five (75) horsepower [sixteen thousand eight hundred square feet (16,800 ft.2) of water radiation at one hundred fifty degrees Fahrenheit (150° F.)];

 

(m)Air compressors having a capacity of less than one hundred ten cubic feet per minute (110 ft.3/min.) at one hundred pounds per square inch (100 lbs./in.2) pressure;

 

(n)Motor or engine driven electric generator sets used for welding or lighting not in excess of fifty kilovolt amperes (50 KVA); or

 

(o)Low pressure steam boilers having gravity or trap returns.

 

400.2The operation and maintenance of the following equipment shall be by or under the daily supervision of a steam or other operating engineer who is duly licensed in the proper class by the Board of Examiners for Steam and Other Operating Engineers in the District of Columbia:

 

(a)Boilers and boiler auxiliaries;

 

(b)Steam engines;

 

(c)Refrigeration equipment with non-toxic and non-inflammable refrigerant driven by electric motors in excess of twenty-five (25) horsepower;

 

(d)Refrigeration systems using the heat absorption cycle with non-toxic and non-inflammable refrigerant;

 

(e)Refrigeration systems of five (5) or more compressor horsepower using a toxic or inflammable refrigerant;

 

(f)Refrigeration systems of three (3) or more tons using the heat absorption cycle with a toxic or inflammable refrigerant;

 

(g)Internal combustion engines in excess of twenty-five (25) horsepower; and

 

(h)Air compressors driven by electric motors or internal combustion engines.

 

authority

Unless otherwise noted, the authority for this chapter is An Act to regulate steam-engineering in the District of Columbia, approved February 28, 1887, 24 Stat. 427, ch. 272. Sec. 2.

source

§§1.1 and 1.2 of Commissioners' Order No. 301, 945, 5M DCRR §§1.1 and 1.2.