CSA C22.2-NO.187:2015 pdf download.Electrostatic air cleaners
6.5.1 An air cleaner shall withstand without breakdown for 1 min an essentially sinusoidal voltage of 60 Hz,applied as follows:
a) twice the maximum rated primary voltage plus 1000 V, between the primary circuit and exposed or grounded metal;
b) 125% of the maximum measured or rated secondary voltage (whichever is greater), between the primary and secondary windings and between the secondary and resonating windings of the transformer. This test shall be omitted if any point of the secondary winding is grounded. If the resonating winding and the high-voltage windings are common, the tests between the resonating winding and the secondary winding shall be omitted; and
c) 150% of the maximum rated primary voltage applied to the ends of the primary winding of the transformer, with one end of the primary winding connected to the enclosure. If the transformer does not have a grounded secondary winding, this test shall be conducted first with one end of the secondary, and then with the other end, connected to the common connection of the primary and the enclosure. If the transformer has a point, other than an end point, of its secondary windings that is grounded, the test shall be performed without an electrical connection between either end of the secondary and the common connection of the primary and the enclosure.
6.6.1 The time required for the high-voltage to decay to a value approximating the supply-circuit voltage after the primary circuit has been de-energized shall be determined in accordance with Clauses 6.6.2 to 6.6.4. The power supply supplied with the air cleaner shall be used for this test. Rheostats or other controls provided on the power supply shall be adjusted to create the most extreme condition possible and, if rheostats or other controls are likely to be determining factors during testing, the maximum number of filter cells shall be connected to the output of the power supply.
6.6.2 A neon test lamp, connected in parallel with a potentiometer, shall be connected to a 120 V ac supply source and the potentiometer shall be adjusted until the voltage supplied to the lamp is the minimum amount required to cause the lamp to glow. This shall be done by gradually increasing the voltage across the lamp until the lamp glows.
6.6.4 The unit shall be energized for a period of at least 30 S during each trial, after which the unit shall be de-energized by interrupting the primary supply circuit. When a period of time has elapsed after the opening of the primary circuit, during the first trial, the potentiometer and neon lamp shall be connected between the high-voltage parts of the power pack and the grounded enclosure. For each successive trial, the interval between the opening of the primary circuit and the connection of the potentiometer and neon lamp to the power supply secondary terminal shall be varied until the maximum time delay is found that results in a glow of the neon lamp when the connection is made. After the approximate delay is determined, a number of additional trials shall be made to determine the time required for the voltage to decay to approximately 120 V (see Clause 6.7).CSA C22.2-NO.187 pdf download.