This is the first edition of CSA C22.6 No. 1, Electrical inspection code for existing residential occupancies. Compliance with the requirements of this Standard will in some instances necessitate upgrading of portions of electrical installations. To facilitate adoption of the upgrading provisions of this Standard as regulations by the authority having jurisdiction, they have been placed in Annex E and referenced from Clause 4.5. A model guide for application and compliance is included as Annex D. Annex C contains a chronological description of major revisions to the Canadian Electrical Code, Part I, applicable to residential occupancies. This Standard is not intended as an instruction manual for untrained or unqualified persons. CSA acknowledges that the development of this Standard was made possible, in part, by the financial support of the Ontario Electrical Safety Authority.