DC Switch Disconnector for PV system
Posted: Sun Oct 11, 2020 1:27 pm
I’ve been doing inspections on two PV installs, and I have had a bit of difference of opinion with the electrician and his supplier regarding the DC switch-disconnector that is required to be located at the inverter.
Currently there is no separate DC switch-disconnector located at the inverter, only the one that is integrated into the inverter itself. I’ve advised them this would need to comply with 5033/2012:4.4.1.2 (b) in order for a separate switch-disconnector to be absent, and it doesn’t appear to meet this requirement. So I’ve advised they need to install one as per 4.4.1.2 (a).
I’ve been presented with a manufacturers written statement for Australia, advising the inverter complies with 5033/2014:4.4.1.2 (c) and... ‘Due to the above compliance, an adjacent and physically separate load break disconnector is not required in the installation’.
My understanding is this statement is somewhat irrelevant, as it’s for Australia and mentions the 2014 standard, so shouldn’t be relied on in NZ, where the 2012 version is law. The description in 5033/2014:4.4.1.2(c) isn’t even mentioned in the 2012 standard. Therefore a separate DC switch-disconnector should be installed, to comply with the 2012 version. Does this sound right? Am I missing something here? I’ve been told, ‘these units have been installed throughout NZ and it hasn’t been raised as an issue in the past, and that the 2014 standard is the superior one that is recommended and used in NZ by an organisation called SEANZ’.
There’s some resistance to accept what I’m saying is correct so perhaps I’m missing something? In short, can we rely on 5033:2014 in NZ for installation and inspection?
Any advice much appreciated! Thanks
https://www.sungrowpower.com/sites/defa ... %201_0.pdf
Currently there is no separate DC switch-disconnector located at the inverter, only the one that is integrated into the inverter itself. I’ve advised them this would need to comply with 5033/2012:4.4.1.2 (b) in order for a separate switch-disconnector to be absent, and it doesn’t appear to meet this requirement. So I’ve advised they need to install one as per 4.4.1.2 (a).
I’ve been presented with a manufacturers written statement for Australia, advising the inverter complies with 5033/2014:4.4.1.2 (c) and... ‘Due to the above compliance, an adjacent and physically separate load break disconnector is not required in the installation’.
My understanding is this statement is somewhat irrelevant, as it’s for Australia and mentions the 2014 standard, so shouldn’t be relied on in NZ, where the 2012 version is law. The description in 5033/2014:4.4.1.2(c) isn’t even mentioned in the 2012 standard. Therefore a separate DC switch-disconnector should be installed, to comply with the 2012 version. Does this sound right? Am I missing something here? I’ve been told, ‘these units have been installed throughout NZ and it hasn’t been raised as an issue in the past, and that the 2014 standard is the superior one that is recommended and used in NZ by an organisation called SEANZ’.
There’s some resistance to accept what I’m saying is correct so perhaps I’m missing something? In short, can we rely on 5033:2014 in NZ for installation and inspection?
Any advice much appreciated! Thanks
https://www.sungrowpower.com/sites/defa ... %201_0.pdf