The CEC and other California Codes can be amended by city or county, provided the amendment is
"reasonably necessary because of local climatic, geological, or topographical conditions" only.(So seismic, corrosion, etc. qualify) A copy of the findings must be filed w/ the State, and local Code amendments are not enforceable unless filed. This is as of 9-01. If you look at most of the local amendments as written, they qualify. MANY DON'T
Where do the localities get off with some of the "rogue" calls such as hardwiring appliances??
Don't buy a '98 CEC just yet (only $93 here. '01 (based on '99 NEC) is coming up very soon. You're probably OK with '96 NEC and the CA Title 24 energy requirements.(free download of T24 from the state)
Oh yes, be sure to have lots of paper and ink on hand. The Title 24 (although the lighting portion is only 74 pages) non-residential manual is 601 pages long. The residential manual is over 500 pages.
(Plus, of course, the errata sheets)