Nesc table 232 1



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820-10. (c) On Masts.   Aerial cable shall be permitted to be attached to an above-the-roof raceway mast that does not enclose or support conductors of electric light or power circuits.

820-10. (b) Lead-in Clearance.   Lead-in or aerial-drop cables from a pole or other support, including the point of initial attachment to a building or structure, shall be kept away from electric light, power, Class 1, or non-power limited fire alarm circuit conductors so as to avoid the possibility of accidental contact.

Exception:   Where proximity to electric light, power, Class 1, or non-power limited fire alarm circuit service conductors cannot be avoided, the installation shall be such as to provide clearances of not less than 12 in. (305 mm) from light, power, Class 1, or non-power limited fire alarm circuit service drops.

All line wires, conductors, and cables located at different levels on the same supporting structure shall have vertical clearances not less than the following:

The clearances given in Table 235-5 shall apply to line wires, conductors, or cables of 0 to 50 kV attached to supports. No value is specified for clearances between conductors of the same circuit exceeding 50 kV.

EXCEPTION 3:   Supply service drops of 0 to 750 V running above and parallel to communication service drops may have a spacing of not less than 300 mm (12 in) at any point in the span including the point of their attachment to the building or structure being served provided that the nongrounded conductors are insulated and that the clearance as otherwise required by this rule is maintained between the two service drops at the pole.

820-33.   Grounding of Outer Conductive Shield of a Coaxial Cable.   Where coaxial cable is exposed to lightning or to accidental contact with lightning arrester conductors or power conductors operating at a voltage of over 300 volts to ground, the outer conductive shield of the coaxial cable shall be grounded at the building premises as close to the point of cable entry as practicable.   (continues…)

(g)   To the grounding conductor or to the grounding electrode of a building or structure disconnecting means that is grounded to an electrode as covered in Section 250-32;   (continues….)

820-40(d) Bonding of Electrodes.   A bonding jumper not smaller than No. 6 copper or equivalent shall be connected between the

antenna system grounding electrode and the power grounding electrode system at the building or structure served where separate

General Comments:   To be an effective ground, the ground conductor must be securely fastened to a point that is common to the building’s electric service ground electrode.   The conductor must be connected by means of an approved device designed for the purpose.   Grounds may not be attached to hub mounting screws or other locations not intended for conductor attachment.   Multiple conductors may not be attached to a single clamp or device not specifically designed for multiple conductors.   A ground wire or attachment must not be so located that it must be disconnected for access to or service of other equipment.






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