This 'industrial exemption' was repealed under subsection 5(17) of Schedule 2 to the Open for Business Act, 2010 and section 12(3)(a) of the Professional Engineers Act (the “industrial exception”). The intent was to ensure that professional engineers will become more involved in everyday design, especially where health & safety is involved.
However, due to political pressure, the Ontario Government extended the date of implementation (originally to September 1, 2013 and then indefinitely).
Link to info on PEO website