UL 489B-2016 pdf download – Molded-Case Circuit Breakers, Molded-Case Switches, and Circuit-Breaker Enclosures for Use with Photovoltaic (PV) Systems.
1 2.2 A PV circuit breaker shall be wired with a conductor sized in accordance with Table 8.1 or, if intended for bus bars, in accordance with 7.1 .4.1 .1 7 – 7.1 .4.1 .1 9 of Ref. No. 2 of Annex B, and subjected to an ambient temperature of 50°C for a period of 3 hours or until temperatures stabilize. While at 50°C, the circuit breaker shall be subjected to the Calibration Test at 1 00 percent of rated current as described in 7.1 .2.4 of Ref. No. 2 of Annex B, until temperatures stabilize. The PV circuit breaker shall not trip. 13 Limited Fault Interrupting Test 1 3.1 PV circuit breakers shall perform successfully when operated under conditions indicated in 7.1 .7 of Ref. No. 2 of Annex B at the maximum rated voltage specified by the manufacturer. The test current shall be 200 percent of rated current. The operations shall be conducted ″O″ – ″CO″ – ″O″. 1 3.2 During this test, the PV circuit breaker may open automatically or, at the option of the manufacturer, by manual or electrical means, such as with a shunt trip or an electrical operator. When a manual or electrical means is employed, the current shall flow for at least 1 second before opening. 14 Standard Fault Interrupting Test 1 4.1 A PV circuit breaker shall perform successfully when operated under conditions indicated in 7.1 .7 of Ref. No. 2 of Annex B at the nominal rated voltage specified by the manufacturer, except that the prospective current shall be at the standard interrupting rating of the device, but not less than the prospective current used during the Limited Fault Interrupting Test, Clause 1 3. The operations shall be ″O″ – ″CO″ – ″O″. See 1 6.4 and 1 3.2. 1 4.2 Notwithstanding 1 4.1 , the Standard Fault Interrupting Test may instead be conducted at a higher value as tabulated in Table 8.1 of Ref. No. 2 of Annex B. 15 Dielectric Voltage-Withstand Test 1 5.1 PV circuit breakers shall be subjected to the Dielectric Voltage-Withstand Test specified in 7.1 .9 of Ref. No. 2 of Annex B at the voltages specified in 1 5.2.