Numbers were allotted as follows:
Architectural
101-199
Civil
201-299
Electrical
301-399
Mechanical
401-499
Sanitary
501-599
Structural
601-699
Surveys
701-799
Miscellaneous
801-899
Working drawings were given numbers consisting of one-digit or twodigit number, a letter, a dash, and a three-digit number. The first
element indicated the use feature of the work. Use features were assigned numbers as follows;
Site Plans
1
Buildings
2
Special Structures
3
Power Plants
4
Refrigeration
5
Electrical Distribution
6
Communications
7
Signal and Control
8
Water System
9
Sewer System
10
Fuel System
1i
Airstrips
12
Roads
13
Grading and Paving
14
Subaqueous
15
5-15