UL 489B:2016 pdf free download – STANDARD FOR SAFETY Molded-Case Circuit Breakers, Molded-Case Switches, and Circuit Breaker Enclosures for Use with Photovoltaic (PV) Systems.
9.2 Representative devices shall be wired in accordance with the instructions of the PV circuit breaker manufacturer. See also 9.9 and 17.5.
9.3 For the Endurance, Limited Fault Interrupting, and Standard Fault Interrupting Tests, the dc circuit shall have a time constant of not less than 1.0 msec.
9.4 When a PV circuit breaker is marked “line” and “load” in accordance with 17.11, the Endurance and
Temperature Tests shall be conducted with the device wired in the normal (forward) direction. The Limited
Fault Interrupting and Standard Fault Interrupting Tests shall be conducted in the reverse direction. The
Calibration and Trip-out Tests may be conducted in any convenient direction.
9.5 When a PV circuit breaker is not marked “line” and “load” in accordance with 17.11, for Sequences A, B, and C, one representative of the test set, or an additional representative for each test set, shall be provided and tested with opposing line and load connections rather than as required in 9.4. When only one representative constitutes a set, a second representative is required for opposing line-load connection tests.
9.6 Notwithstanding 9.5, for a circuit breaker that is required to be wired in series such that the same number of poles (contacts) are exposed to the current in both directions simultaneously, testing in both the forward and reverse direction is not required.
9.7 When a PV circuit breaker has interchangeable trip units, one representative of the frame and three representatives of the trip unit shall constitute a set.
9.8 For the purposes of this Standard, testing in the forward direction requires the positive terminal of the source to be connected to the normal line terminal of the device. Wiring in the reverse direction requires the positive terminal of the source to be wired to the normal load terminal of the device.
9.9 Each pole of a multipole PV circuit breaker shall be tested individually unless marked in accordance with 17.5 and 17.6, as applicable, and investigated in accordance with 9.10 of this Standard.
9.10 A PV circuit breaker shall be connected in accordance with the wiring instructions of the manufacturer. Multipole PV circuit breakers marked for more than one wiring configuration shall be subjected to a sufficient number of tests to represent all configurations. Examples:
a) For interrupting tests, a configuration with the least number of poles energized would represent configurations with more poles energized.
9.12 For a field wired PV circuit breaker, the wire used to connect to the terminal for the test in Clause
12 shall be sized in accordance with Table 8.1. For the test in Clause 10, the wire may be sized based on either the requirements of Ref. No. 2 of Annex B or Table 8.1. When the tests in Clauses 11 and 12 are combined, the wire shall be sized in accordance with Table 8.1.
9.13 Notwithstanding 9.12, a circuit breaker not intended for wire connection shall be connected to copper bus bars in accordance with 7.1 of Ref. No. 2 of Annex B.
10 Endurance Test
10.1 A PV circuit breaker shall be capable of performing successfully when subjected to the Endurance Test specified in 7.1.5 of Ref. No. 2 of Annex B at the maximum rated dc voltage specified for the circuit breaker. The number of operations of the Endurance Test shall be in accordance with Table 10.1.
10.2 Prior to the Temperature Test, the PV breaker shall be subjected to at least 10 percent of the required electrical operations and 100 percent of the mechanical operations of Table 10.1. Upon completion of the Temperature Test, the remaining electrical operations shall be completed before conducting the Trip-Out Test.