To be sure one question arises for me, my understanding (recently gained!) is the 8 hour "NO" ("Night only") description simply supersedes the "CN8" (Controlled Night for 8 hours) reference. Is there some current tangible difference?
The spec suggests that 'Night only' is for specific fixed specific times, at night only.
CN is:
Controlled - all load on the channel is subject to control by the distributor at any time via a load control device.
The classic one being WE's hot water control, which simply says that you get a minimum of 19 hours a day. It shouldn't matter for billing whether it runs 24/7, is off at peak time, is off at midnight, or varies depending on conditions. A CN-8 similarly doesn't necessarily imply that the 8 hours are at night, nor a CN-10.
I suspect that the status of 'grandfathered' is misleading. The comments state:
Use of CN is grandfathered [only] for fully controlled at fixed times, night only and night boost metering installations (for example CN8 and CN11) until the next recertification. All new and recertified night only and night boost metering installations to use NO or NB (as appropriate)
I suspect that use of CN is allowable for installations that meet the definition, where the distributor chooses the schedule rather than it being pre-agreed. It may be worth a post on the EA's market forums.
Alternatively, they may want to discourage use of a dedicated meter channel for controlled HWC loads, and just fold it into the 'all inclusive controlled' IN code; WE's AICO. This essentially gets you a ~10% discount on all your power, rather than having a separate meter and rate for the controlled loads.
My interpretation of that is my designation of "CN8" will endure until the meters are re-certified (well beyond 2030) and until then subject to turning on and off at any time via ripple control. After that the designation will change to "NO" when change times will only be at the fixed designated times. The current designation for the register that caused this thread is noted in the registry as CN8. I suppose that's plausible.
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