Non potable water systems

Yes they are. the exception may be stormwater depending on how that is treated there may be some system components that would require Cx.

Marcus is correct, of course. LEED does not try to provide an exhaustive list of systems, which would never be complete. They refer to commissioning of systems "as they relate to energy, water, indoor environmental quality, and durability." That is right out of the Reference Guide for v4 by the way. There is a short list of systems that also mentions plumbing. In general, I feel a broad list of systems is more value to the client, so I spend more time thinking of what needs to be tested to ensure proper operation. So a complex stormwater sump pump system might not strictly fit the LEED definition, but really bad things happen if that system does not work! Now a sump pump for a foundation drain may not be as important, but if feeding into a stormwater flushing system, it is key to providing a significant amount of water into that system.

Yep, yep. Don't do just the minimum, do what makes sense for your project!

Fire protection is not part of the LEED standard, and most AHJs require pretty complete testing. Therefore it is rare if I include FP in the commissioning scope, but if there is a complex smoke control system or the fire pump is integrated into an emergency generator system, then some portion should be tested. You will have to clarify what you mean by gas supply before I can comment on that. Medical or laboratory gases are again outside the scope of LEED, but in an integrated system, commissioning alarms and other safety devices is certainly of value to the owner.

Anyone have any insight into the expanded electrical Cx scope in v4? From the Ref Guide list of systems that need to be commissioned: Electrical, including service, distribution, lighting, and controls, including daylighting controls”. What should be included under electrical service and distribution? Thanks.

Rebecca, I know you found my response elsewhere, but for the sake of completeness, here is what I had to say about this from an earlier question. This particular scope item is not that changed from v2009. However, since v4 brings ASHRAE 90.1-2010 into play, that standard requires commissioning of lighting controls, and in my experience, 100% of lighting controls should be performance tested...there are too many different conditions and settings in these systems and devices to use statistical testing...in my opinion of course. In general, the commissioning scope of LEED has always centered around systems involved in using or controlling energy or water; especially anything related to LEED credits. A simple example is that a sump pump is not typically a required item in a LEED scope, but if coupled to a rainwater capture system, it would be part of the system that is saving potable water. So, in an electrical "service and distribution" system it would be items that relate to credits or are involved in controlling energy. One example I can think of would be the new Demand Control credit. You can get a point if you are "ready" to shed load if your local utility offers the service. This would mean there are controls in place that upon getting a signal can shed load in a meaningful way. That system would need to be commissioned. Another would be if advanced metering is being pursued, then all those meters would need to be commissioned. All of the above is focused on scope as required by LEED, but there are lots of very good reasons to do more extensive Cx for electrical distribution systems, especially in healthcare. But that is not the topic of this reply!