UL 1676:2001 pdf download – Conductive-Path and Discharge-Path Resistors for Use in Radio-,Video-, or Television-Type Appliances.
5.4 Dielectric voltage-withstand test
5.4.1 Each resistor tested as specified In 5.1.1 — 5.3.2 shall be subject 10 the test specified In 5.4.2 —
5.4.5. The resistance of each resistor, measured at least 15 mm after the test and not more than 1 h after the test:
a) Shall be 12 MU or less, and
b) Shall be within —50 percent ci the initial resistance measured. See 5.1.1.
54.2 The test potential applied to eadi resistor is to be 1000 V rms, smusoidal. 60 Hz. and is to be applied across the resistor leads for 1 mm,
5.4.3 The test potential to be obtained from a transformer that provides a variable output voltage. The applied potential is to be rncreased at a unocm rate from zero to the specified test value within 5 s. A manual or automatic means shall be used to control the rate of rise.
5.4.4 The sensitivity of the test equipment is to be such that when a resistor having a value of 120.000 U is connected across the output, the test equipment indicates that the resistor has performed as intended for any output voltage less than the specified test voltage, and has not performed as intended for any output voltage equal to or greater than the specified test voltage.
5.4.5 In the event a resistor being tested dissipates more than rated power while the dielectric voltage-withstand potential is applied, cooling the resistor by artificial means complies with the requirement.
6 Conductive-Path Resistor Tests
6.1 General
6.1,1 The initial resistance of 10 as-received, conductive-path resistors is to be measured
6.2 Humidity conditioning
6.2.1 Folowing the measurements specified in 6.1.1. the conductive-path resistors are to be subjected to the humidity conditioning as described wi 5.2.2.
Strain Relief Test
8.1 One as-received resistor shall withstand, for 1 min,without damage, a 22.2 N force applied in anydirection possible to the leads or terminals.
8.1 revised October 16,2001
9 Torque Test
9.1 A terminal, tab, or tang on one as-received resistor shall withstand, for 1 min, without damage, atorque of 0.07 N-m applied at a right angle to the terminal, tab, or tang.
9.1 revised October 16.2001
9.2 An axial wire lead on a resistor shall withstand the test specified in 9.3.The lead shall not break, andthe resistor body shall not be damaged.
9.3 Each lead is to be bent through 90 degrees at a point 6.4 mm from the point of emergence of thelead. The radius of curvature of the bend is to be 0.8 mm. The free end of the lead is to be clamped towithin 1.2+0.4 mm of the bend. The body of the resistor is then to be rotated through 360 degrees aboutits original axis. The rate of rotation is to be 2- 5 s per 360 degrees.Successive rotations are to be inalternate directions. A total of three such 360 degrees rotations is to be performed after which the resistoris to be visually examined for evidence of lead breakage or damage to the resistor body.
9.3 revised Oclober 16,2001
10 General
10.1 A resistor shall be rated in ohms and watts.
10.2 For a discharge-path resistor only, the resistor intended for use in up to 125 V circuits shall not berated less than 480 k2 or more than 12 MQ. A discharge-path resistor intended for use in 126- 250 vcircuits shall not be rated less than 960 k2 or more than 12 MQ2.
10.3 For a discharge-path resistor only, the resistor shall be rated 1/2 w or greater.