Which is not a minimum safety requirement for residential buildings wired in Canada and moved into Washington?

The reason that the dedicated bathroom receptacle circuit must be installed per current WAC (Washington Administrative Code) code is a specific safety requirement tied to the electrical safety standards in Washington. While it is essential for residential buildings to have specific circuits for certain areas, such as bathrooms, this requirement is somewhat dependent on the local electrical codes governing wiring rather than being a minimum requirement that uniformly applies to all situations.

In Washington, NEC (National Electrical Code) compliance encompasses a broad spectrum of wiring and safety standards that ensure the safety of electrical installations. Thus, the other options, including compliance with NEC codes, meeting local weather resistance standards for roofs, and proper installation of grounding systems, are indeed minimum safety requirements that must be adhered to for any building, whether newly constructed or moved into the state.

Therefore, while it's imperative for a dedicated bathroom receptacle to exist, the focus on WAC code for this specific situation signifies it's not a universal minimum safety requirement at the same level as NEC compliance or structural safety standards for roofs and grounding, which have more extensive safety implications. This means the answer is distinct as it does not represent a baseline requirement universally applicable to all residential wiring scenarios within the state.