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www.imopc.com 9 It is because of this that the IMO Solar Isolator range is constructed of materials that signiﬁcantly reduce the risk of a ﬁre hazard and in particular our enclosed installation style products for which the main plastic enclosure is rated at UL 94V-0 and the handles are UL 94V-2 rated. The classiﬁcation criteria for each of these ratings is found in of the UL 94 Table 8.1 (see extract below). The installation requirements and environments of PV systems can vary signiﬁcantly and the IMO Solar Isolator has been designed such that it can oﬀer a wide range of conﬁgurations depending upon the users’ requirement. Also the IMO Solar Isolator range includes models that, when mounted in accordance with their respective instructions and with the appropriate IMO handle, oﬀer suitable protection up to IP66 (EN 60529) and NEMA 4X (Nema 250, UL508). With the advent of more worldwide installations and the requirements laid down in many country’s national wiring publications for the use of DC switches in PV installations, the IMO Solar Isolators have also been assessed and tested under the latest UL standard UL508i which has been speciﬁcally written to cover the use of “Manual Disconnect Switches intended for use in Photovoltaic Systems”. This UL508i standard speciﬁcally covers switches rated up to 1500 V that are intended for use in an ambient temperatures of -20 °C to +50°C, and that are suitable for use on the load side of PV branch protection devices. In order to comply with this standard the IMO DC Isolators has to pass an overload test, at +50°C, of 50 cycles at 200% of rated current; followed by an endurance test of 6000 cycles (6 cycles/min) at rated load (Ith) and a further 4000 cycles with no current. The IMO DC Isolator has successfully attained certiﬁcation under the UL508i standard and as such is suitable for use as a disconnection method for the isolation of the output of DC PV array where it is to be connected to a DC/AC inverter. Criteria conditions V-0 V-1 V-2 Afterﬂame time for each individual specimen t1 or t2 <10s <10s <30s Total afterﬂame time for any condition set (t1 plus t2 for the 5 specimens <50s <250s <250s Afterﬂame puts afterglow time for each individual specimen after the second ﬂame application (t2+t3)<30s <60s <60s Afterﬂame or afterglow of any specimen up to the holding clamp No No No Cotton indicator ignited by ﬂaming particles or drops No No Yes Examples of Typical PV Installations Single String System – 3kW Output Single Phase Consider two potential conﬁgurations for a typical 3kW system which would supply 13A at 230VAC: Inverter: Input: 600VDC (VOC), 16A (IDC), 32A (IDC max) Output: 230VAC (VAC), 13A (IAC), 17.2A (IAC max) Solar Panel: 60V (VOC), 8A (ISC) No. of panels: 8 Calculation: V = 8 x 60 x 1.15 = 552V I = 8 x 1.25 = 10A For this conﬁguration, the IMO SI16-PEL64R-2 rated at 16A for 700VDC is suitable for the DC switch and the PE69-3020 rated at 20A is suitable for the AC switch. Inverter: Input: 750VDC (VOC), 15A (IDC), 28A (IDC max) Output: 230VAC (VAC), 13A (IAC), 16A (IAC max) Solar Panel: 60V (VOC), 8A (ISC) No. of panels: 10 Calculation: V = 10 x 60 x 1.15 = 895.62V I = 8 x 1.25 = 10A For this conﬁguration, the IMO SI25-PEL64R-2 would still be suitable as it is rated at 16A for 800VDC, however the IMO SI25-PEL64R-2 rated at 16A for 900VDC would allow for a greater margin of safety. The PE69-3020 rated at 20A is suitable for the AC switch. L N E Existing AC Equipment DC Isolator Inverter AC Isolator 600V: SI16-PEL64R-2 3kW PE69-3020 750V: SI25-PEL64R-2 PE69-3020 PV Arrays + + + + - - - - + + + + - - - - L N E 534 S Sycamore St - 10110979707/01/22