Creative Tech designs that are competitive in safety and cost effective must be encouraged. Compliance monitoring bodies of course need to inspect for safety but they must not be too bookish to make their decisions. If all parts used are certified by CSA or other certification body, field assembled controls must be allowed that are equally safe and cost effective solutions.
Safe and cost effective
It is very creative process to design your own systems than buying from market.
If we buy a transfer switch three pole 40 Amp rating from market it is $1100 to $1200.
What a transfer switch does – it shifts Two or three output terminals from one input source to other input sources.
It can be achieved by buying two CSA Certified Contactors (three pole) and install in a CSA certified enclosure and interlock them so that they do not kick in at the same time. In other words if one source fails it safely shifts the loads to the other source, but not feed two sources at any given time. It can be done in $200 but creativity is not encouraged. Sometimes I feel we are just forced to buy way expensive material that is safely replaceable with better design and is perfectly safe.
Electrical Engineers can express their concerns if any. It does not make sense to spend $1200 just for 40Amp transfer Switch.
