The National Electrical Code at this time served the purpose of not just specifying installation methods, but construction methods, as well. The “listing” mechanism was not built out through UL or other third parties yet, so if you wanted to know if a cartridge fuse was built to spec or not, you’d reference No. 53 in the 1905 NEC. All of Class D is about product construction. They also specify that those kinds of products have the words “National Electrical Code Standard” on them, or “N. E. Code St’d” if there’s not room.
They also mandated the wiring practices inside of cars, which was still a nascent industry.
Known errata:
- 25(d) “Must be equipped at every outlet with an approved outlet box or plate (see No. 49 l to o).” – This reference is incorrect, and is referring to 49(A). Likely, 49(A)(a)-(g) was originally a continuation of No. 49, with subsections (l)-(r), and later changed to distinguish switch and outlet boxes from general conduit.
- 24(t) “Mixed concealed knob and tube work as provided for in No. 24 s, must comply with requirements of No. 24 [blank] to p…” The book that was scanned for this release appears to be missing the proper reference. It should read “No. 24 n to p”, referring to the Conduit Work section of “Wiring”. It doesn’t look like an error with the inking/stamping process to me, it looks like someone forgot to put the “n” in the original plate form. Curious to know if other 1905 owners have this error, as well.
The inside of the front cover apparently has information about lists of approved fittings, but the scan I had access to did not have the original cover and didn’t include that information. Please reach out if you have access to that information.