electrical drawings

drawings are created in AutoCAD Electrical and are numbered by pages and by lines:

wire numbering conventions

• The hexagons on each side of the page are drawn with a page number over a line number.
• Wire numbers are derived from the line number and page number on which they originate.
  • e.g. on page 1, line 09, wire 1040 connects to a circuit breaker and then wire 1090 connects the circuit breaker to the motor's control relay and overload heater. From there, wire 1091 connects the heater to one of 3 inputs to the three-phase motor
    • wire 1040 is L1 of the 3-phase 480VAC input, which originates from the terminal block on page 1, line 04.
    • wire 1090 is the first unique node on page 1, line 09.
    • wire 1091 is the second unique node on page 1, line 09

sheet numbering conventions

drawing sheets are non-consecutively numbered. There is no single standard, two examples are Brian's convention and Steve's conventions, as shown below:

Characteristics applicable to both Systems:

• Page groups which do not apply are omitted.
  E.g. a 208 VAC system would start with 208 VAC input lines (L1, L2, and L3) on pg. 1 and all other page number groups would decrement by 10.
• If only 2 pages of 24 VDC distribution are required, the pages would number: $\dots 20,21,30,31\dots$ and skip the unused page numbers.

Brian's convention

From the mind of Brian Matheny:

Steve's conventions

Chart below as created by Steve Kalmar