UL 1283-2015 pdf download
UL 1283-2015 pdf download.Electromagnetic Interference Filters.
28.3 Alternating-current test voltages shall be applied at a frequency of 40 — 70 Hz and shall be essentially sinusoidal,
28.4 lithe enclosure of a filter is nonmetallic, or is metal with an insulating sleeve, metal foil shall be wrapped around and in intimate contact with the body of the filter so as to leave a space of 5 mm between the edge of the foil and any bare lead or terminal. An ac potential of 2 times rated voltage plus 1500 V shall be applied for 1 minute without breakdown between the foil and live parts as well as between the foil and the grounding terminal or lead.
28.5 The test potential roentioned in Tables 28.1 and 28.2 is to be obtained from any convenient source of sufficient capacity — at least 500 VA, except that a lower capacity source may be employed if the meter is connected in the output circuit — to maintain the potential indicated in Table 28.1 and 28.2 except in the case of breakdown. The voltage is to be gradually increased until the required test level is reached and is to be held at that value lot one minute. The increase in the applied potential is to be at a uniform rate and as rapid as is consistent with its value being correctly indicated by a voltmeter,
29 InsulatIon Resistance
29.1 After the conditioning as described in 29.3, a filter shall have an insulation resistance of not less than
2 megohms between live parts and accessible dead metal parts, excluding any parallel resistors from live
parts to accessible dead metal parts provided as part of the filter constwchon.
Exception.’ A bleeder resistance provided between live and dead metal parts may be disconnected during th,s test.
29.2 For a filter whose outer enclosure consists wholly or partly of insulating material, the term accessible dead metal parts as used in 29.1 signifies metal foil wrapped around and In intimate contact with the exterior of the enclosure so as to leave a space of 5 mm between the edge of the foil and any terminal or bare lead.
29.3 The filter is to be conditioned for 48 hours at a relative humidity of 93 ±2 percent. The temperature of the air is to be maintained within 1.0°C (1.8°F) of any convenient temperature in the range 20.0 — 30.0°C (68.0 — 86.0°F). The specified relative humidity can be obtained by placing a supply of a saturated solution of potassium sulphate inside a tightly closed compartment.
29.4 The measurement of insulation resistance is to be made with the filter still In the conditioning chamber or immediately upon removal from the test chamber.
29.5 In determinations of Insulation resistance, a direct potential of not less than 250 V Is to be employed, and the value of insulation resistance is to be determined one minute after application of the test potential. The filter is not to be energized during the test. All line conductors, grounded and ungrounded, are to be connected together and to one side of the test supply voltage for this test.
30 Overload
30,1 The filter shall be mounted so as to provide free air flow around all sides and the top and bottom, The ambient temperature shall be 25 ±5°C (77 ±9°F). The load current and time durabon shall be as indicated In 30.2. Rated frequency shall be used. Any voltage not higher than the rated voltage may be used. The filter shall not show evidence of ignition, sealant leakage. cracking, breakage, or similar physical damage.
30.2 For a filter with integral overcurrent protection, the overload current is to be 135 percent of the overcurrent protective device rating. For a filter without integral overcurrent protection, other man an appliance filter, the overload current is to be 135 percent of the current rating of the maximum size branch circuit to which the filter can be properly connected, For an appliance filter without integral overcurrent protection, the overload current is to be 135 percent of the filter current rating. The overload test current is to be applied for 1 hour for test currents up to 81 A and 2 hours for test currents greater than 81 A. The integral overcurrent protective device is to be shunted Out of the circuit for this test.
