Frank I am confused now too as the CEC has no subrules under 2-024 and perhaps these subrules are Ontario Amendments (I hate amendments)
I will try to expound on the general idea of approved equipment. In your case I expect the need for a product approval or site approval will be related to the control cabinet.
If your controls are supplied from a class 2 power supply and the wiring methods are correct for voltage, condition of use, and type of enclosure as well as wire chosen for location from table 19 then you have all the approvals you require. This assumes the class 2 assembly is not installed in a hazardous location or suplies lighting fixtures. If the controls are Class 1 or normal low voltage then the control cabinet is going to require a site approval from a recognized testing agency who will apply a special inspection sticker giving the inspection athority the OK they need to pass the install. In this second scenario the use of all approved products is also essential. IE limit switches or counters in the field must be in approved enclosures apropriate to the location etc. In other words if you are using an approved wiring method to connect the various componenets together they don't require special approval.
Now if everything you assemble together is made up of approved components and used exactly as they are approved then there is no need for a field inspection. The danger in all this usually lies in the Control Cabinet, if there is one. You buy an empty cabinet and mount terminal strips and install some relays add a few push buttons and a power supply. each piece of the control system is approved but not as an assembly so the field approval should involve a temperature test, Insulation test, bonding test, and an evaluation of the seperation between power and control circuits. If each and every part of the control system comes with it's own enclosure and has been wired as completely seperate devices by a method from section 12 then no site approvals are needed but don't modify any part. If you use a relay and put it in a general purpose box you have created a piece of equipment. If you buy a motor starter enclosure and install their relay block and add the push buttons that are a factory option for that enclosure and starter then the factory has already had the product approved for all their various accessories.
I hope this is what you are after.
