Table 1-Minimum Separation for Telecommunications Wires and Cables on or in Buildings
Foreign facility or obstruction | Minimum clearance in. [mm]1 2 telecommunications company's wires or cables |
Electric supply wire including neutral and grounding conductors: | |
Open | 4 [102] |
In conduit | 2 [50.8] |
Radio and television antennas, Lead-in and grounding conductors | 4 [102] |
Lightning rods and lightning conductors | 3 72 [1830] |
All foreign grounding conductors except lightning rod ground conductors | 2 [50.8] |
Neon signs and associated wiring | 6 [150] |
Metallic objects-pipes (gas, cold water, oil, sewer) and structures | 4 2 [50.8] |
Wires or cables of another communications system | 2 [50.8] |
1 If minimum separation cannot be obtained, nonshielded wire and cable facilities shall be protected with either porcelain tubes or flexible tubing as modified by Notes (3) and (4) of this table.
2 Separation applies to crossings and parallel runs.
3 If this separation cannot be obtained, bond the telecommunications grounding conductors or grounding electrode to the lightning rod grounding conductor or grounding electrode with at least a Number (No.) 6 AWG copper, insulated, ground wire. With this provision a minimum separation of 4 in. (100 mm) is acceptable but this provision must not be utilized if the separation cited in this table can be maintained.
4 Increase to a minimum of 3 in. (75 mm) separation from steam or hot water pipes, heating ducts, and other heat sources.
Table 2-Color Codes For Tip And Ring Connections of Inside Wiring Cable
Pair | Tip | Ring | ||
Color of insulation | Color of marking | Color of insulation | Color of marking | |
1 | White | Blue | Blue | White |
2 | White | Orange | Orange | White |
3 | White | Green | Green | White |
4 | White | Brown | Brown | White |
5 | White | Slate | Slate | White |
6 | Red | Blue | Blue | Red |
7 | Red | Orange | Orange | Red |
8 | Red | Green | Green | Red |
9 | Red | Brown | Brown | Red |
10 | Red | Slate | Slate | Red |
11 | Black | Blue | Blue | Black |
12 | Black | Orange | Orange | Black |
13 | Black | Green | Green | Black |
14 | Black | Brown | Brown | Black |
15 | Black | Slate | Slate | Black |
16 | Yellow | Blue | Blue | Yellow |
17 | Yellow | Orange | Orange | Yellow |
18 | Yellow | Green | Green | Yellow |
19 | Yellow | Brown | Brown | Yellow |
20 | Yellow | Slate | Slate | Yellow |
21 | Violet | Blue | Blue | Violet |
22 | Violet | Orange | Orange | Violet |
23 | Violet | Green | Green | Violet |
24 | Violet | Brown | Brown | Violet |
25 | Violet | Slate | Slate | Violet |
7 C.F.R. §1755.505