UL 201:2008 pdf download – Garage Equipment.
47.5 Equipment intended for connection to an ac mains supply shall be tested over a tolerance of +6 percent and -10 percent, unless:
a) The rated voltage is 230 V single phase or 400 V three phase, in which case the tolerance
shall be taken as +10 percent and -10 percent;
b) A wider tolerance is declared by the manufacturer, in which case the manufacturer’s
declared tolerance shall be used.
47.5 electite January 27, 2007
47.6 When testing equipment designed for de connections, the possible infuence of polarity shall be taken into account.
47.6 eective January 27. 2007
47.7 Garage equipment rated 50 – 60 hertz is to be tested at 50 and 60 hertz.
47.7 eficive January 27, 2007
48 Leakage Current Test
48.1 Cord connected garage equipment rated 240 V or less, and employing a grounding conductor, is to be tested for leakage current in accordance with 48.2 – 48.4. The leakage current shall not be more than 3.5 mA. Systems of interconnected equipment with individual connections to primary power shall have each piece of equipment tested separately. Systems of interconnected equipment with one common connection to primary power shall be treated as a single piece of equipment. The tests specified in 48.2 – 48.6 are to be performed using the measuring instrument described in Appendix B, or any other circuit giving the same results, and using an isolating supply transformer as shown. When the use of an isolating transformer does not meet the intent of this requirement, the equipment is to be mounted on an insulating stand, not earthed, and precautions are to be taken in view of the possibility of the body of the equipment being at a primary voltage.
48.1 elective January 27, 2007
48.2 All exposed conductive surfaces are to be tested ftor leakage currents. The leakage currents from these surfaces are to be measured to the grounded supply conductor individually as well as collectively where simultaneously accessible, and from one surface to another if simultaneously accessible. A part is considered to be exposed unless it is guarded by an enclosure that is acceptable for protection against the risk of electric shock in accordance with Section 11, Accessiblility of Uninsulated Live Parts, Film-Coated Wire, and Moving Parts. Surfaces are considered to be simultaneously accessible if they can be readily contacted by one or both hands of a person at the same time. These measurements do not apply to terminals operating at voltages that are not considered to involve a risk of electric shock, see
29.4. If all accessible surfaces are bonded together and connected to the grounding conductor of the supply circuit cord, the leakage current may be measured between the grounding conductor and the grounded supply conductor. If exposed dead metal parts of a product are connected to the neutral supply conductor, this connection is to be open during the test.
48.2 elctive January 27, 2007
48.3 If a conductive surface other than metal is used for an enclosure or part of the enclosure, leakage current is to be measured using a metal foil with an area of 10 by 20 centimeters (4 by 8 inches) in contact with the surface. If the surface is less than 10 by 20 centimeters, the metal foil is to be the same size as the surface.
48.6 Three phase equipment and equipment intended for operation between two phase conductors are
to be tested using the circuit in Figure 48.2, with the selector switch in each of the positions 1 and 2. For each position of the selector switch, any switches within the equipment, controlling primary power and operated in normal use, are to be opened and closed in all possible combinations. Any components used for EMI suppression and connected between phase and earth are to be disconnected one at a time; for this purpose, groups of components in parallel connected through a single connection are to be treated as single components. None of the current values shall exceed the limit.