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Original General Order 128

 

Appendix A

 

Summary of Dimensions, Clearances and Depth Requirements

 


Table 1 Clearance and Depth Requirements for Supply and Communication Systems

 

Case No.

Nature of Clearance or Depth

Requirements

Reference Rules

Clearances

1

Cables when independently installed *

3 concrete, 4 brick, or 12 earth

33.4-A(1)(a) , 33.4-A(2)(a) , 43.3-A

2

Cables when concurrently installed *

No separation required when parties mutually agree
For random separation, see Rule 43.3-B(1)

33.4-A(1)(b) , 33.4-A(2)(b)43.3-B

3

Cables and Ducts From Foreign Structures(Except Supply or Communication Systems) when independently installed

12 when paralleling and 6 when crossing

31.4-A(1) , 33.4-A(3)(a)41.4-A(1) , 43.3-A

4

Cables and Ducts From Foreign Substructures(Except Supply or Communication Systems) when concurrently installed

No separation required when parties mutually agreeFor random separation, see Rule 43.3-B

31.4-A(2) , 33.4-A(3)(b) , 41.4-A(2) , 43.3-B

5

Separation of Communication and Supply duct systems independently installed

3 concrete, 4 brick or 12 earth

31.4-B(1) , 41.4-B(1)

6

Separation of Communication and Supply duct systems concurrently installed

No separation required when parties mutually agree and both systems are in rigid ducts

31.4-B(2) , 41.4-B(2)

Depth

7

Depth of Cables and Ducts Under Railroads

30 below street railroads,42 below other railroad

31.4-C(1) , 33.4-B ,

41.4-C(1) , 43.3

8

Depths of Supply Cables and Ducts

0 - 750 Volts: 24 below Thoroughfares
18 elsewhere (Sidewalks, Parkways and Private Property)
751 - 35,000 Volts: 24
Above 35,000 Volts: 36

31.4-C , 33.4-C , 33.4-D

9

Depths of Communication Cables and Ducts

18 below Thoroughfares, 12 elsewhere (Sidewalks, Parkways and Private Property)

41.4-C , 43.3

*    For definitions of independently and concurrently installed, see Rules 20.5 and 21.8 .
 

   Clearances and depths shown may be reduced under certain conditions - see referenced rules. For measurement of clearance, see Rule 17.9 .