Ch. 2

2004 LAWS OF MARYLAND

1. AN AUTOTRANSFORMER IN WHICH THE PRIMARY AND
SECONDARY WINDINGS ARE NOT ELECTRONICALLY ISOLATED AND AT LEAST A
PORTION OF THE SECONDARY VOLTAGE IS DERIVED FROM THE PRIMARY WINDING;

2. A DRIVE TRANSFORMER DESIGNED ONLY TO PROVIDE
POWER TO OPERATE AN ELECTRONIC VARIABLE SPEED MOTOR DRIVE;

3.       A GROUNDING TRANSFORMER DESIGNED ONLY TO
PROVIDE A SYSTEM GROUND REFERENCE POINT;

4.       A HARMONIC TRANSFORMER DESIGNED TO SUPPLY A
LOAD WITH A HIGHER THAN NORMAL HARMONIC CURRENT LEVEL AND THAT HAS A
K-RATING OF K-4 OR GREATER;

5.       AN IMPEDANCE TRANSFORMER THAT HAS A SPECIFIED
IMPEDANCE OF LESS THAN 4% OR GREATER THAN 8%;

6.       A MACHINE TOOL TRANSFORMER DESIGNED ONLY TO
PROVIDE POWER TO MACHINE TOOL EQUIPMENT;

7.       A RECTIFIER TRANSFORMER DESIGNED TO PROVIDE
POWER ONLY TO A RECTIFIER CIRCUIT AND THAT HAS A NAMEPLATE RATING FOR
BOTH THE FUNDAMENTAL FREQUENCY POWER RATING AND THE RMS POWER
RATING;

8.       A REGULATING TRANSFORMER WITH AUTOMATIC TAP
CHANGERS;

9.       A SEALED AND NONVENTILATING TRANSFORMER
DESIGNED TO PREVENT AIRFLOW THROUGH THE TRANSFORMER;

10.     A TESTING TRANSFORMER DESIGNED ONLY AS PART OF,
OR TO SUPPLY POWER TO, ELECTRICAL TEST EQUIPMENT;

11. A UPS TRANSFORMER DESIGNED ONLY AS AN INTEGRAL
PART OF AN UNINTERRUPTIBLE POWER SYSTEM; OR

12, A WELDING TRANSFORMER DESIGNED ONLY TO PROVIDE
POWER TO WELDING EQUIPMENT.

(10) (9) "PACKAGED AIR-CONDITIONING EQUIPMENT" MEANS
AIR-CONDITIONING EQUIPMENT THAT IS BUILT AS A PACKAGE AND SHIPPED AS A
WHOLE TO END-USER SITES.

(11) (10) "PASS-THROUGH CABINET" MEANS A COMMERCIAL
REFRIGERATOR OR COMMERCIAL FREEZER WITH HINGED OR SLIDING DOORS ON
BOTH THE FRONT AND REAR OF THE REFRIGERATOR OR FREEZER

(12) (11) (I) "REACH-IN CABINET" MEANS A COMMERCIAL
REFRIGERATOR        OR, COMMERCIAL        FREEZER,        OR        COMMERCIAL

REFRIGERATOR-FREEZER WITH HINGED OR SLIDING DOORS OR LIDS, BUT
EXCLUDES.

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