2010 Census occ classification mistmatch code for Solar Photovoltaic Installers


I am working with the 2010 occupation classification system and have found a mismatch between the occupation Solar Photovoltaic Installers and the code.

These the two sources below say that the occupation code for Solar Photovoltaic Installers is 6530

However, these other two sources below say that the code is 6540


The other occupation that gets switched is Structural iron and steel workers

I am wondering which source is the right one?
Thank you,

Thank you for bringing this to our attention. It does appear that these labels were inadvertently switched. In the 2011-2019 samples, OCC = 6530 should refer to structural iron and steel workers while OCC = 6540 are solar photovoltaic installers. I have alerted the CPS team to this issue so that it can be addressed.