Rule 20.4

20.4    Catenary Construction, applied to trolley systems, means construction wherein auxiliary wire or cable messengers are in alignment with and support trolley contact conductors at one or more (usually many) points throughout the spans.

Strikeout and Underline Version

Rule 20.4

20.4    Catenary Construction, applied to trolley systems, means construction wherein auxiliary wire or cable messengers are in alignment with and support trolley contact conductors at one or more (usually many) points throughout the spans.

20.3    Cable means a stranded conductor (single conductor cable) or a combination of conductors insulated from one another (multiple-conductor cable).

A.    Fiber Optic Cable (Communication) means a fiber optic cable meeting the requirements for a communication circuit and located at the communication level. 

B.    Fiber Optic Cable - Supply means a fiber optic cable located at the supply level.

C.    Dielectric Fiber Optic Cable Facility means a fiber optic cable, support messenger and lashing wire which contains no internal or external components capable of conducting electricity.  A Dielectric Fiber Optic Cable Facility does not include pole mounted hardware or splice closures; for example, bolts, fasteners or clamps

D.    Non-dielectric Fiber Optic Cable Facility means a fiber optic cable, support messenger and lashing which contains internal or external components capable of conducting electricity.

(1)    Electrically Isolated means the conductive members of a non-dielectric fiber optic cable facility have been conditioned to prevent the transfer of system voltages from one level on a structure to another.  For example, from supply to communications or from one supply level to another.  The appropriate level of isolation may be achieved through electrical or mechanical methods.  Mechanical methods shall be engineered for the voltage and conditions to which the facility is exposed, but not less than a 15” minimum gap, used in conjunction with a non-conductive closure.

Final Version

Rule 20.4

20.4    Cable means a stranded conductor (single conductor cable) or a combination of conductors insulated from one another (multiple-conductor cable).

A.    Fiber Optic Cable (Communication) means a fiber optic cable meeting the requirements for a communication circuit and located at the communication level. 

B.    Fiber Optic Cable - Supply means a fiber optic cable located at the supply level.

C.    Dielectric Fiber Optic Cable Facility means a fiber optic cable, support messenger and lashing wire which contains no internal or external components capable of conducting electricity.  A Dielectric Fiber Optic Cable Facility does not include pole mounted hardware or splice closures; for example, bolts, fasteners or clamps

D.    Non-dielectric Fiber Optic Cable Facility means a fiber optic cable, support messenger and lashing which contains internal or external components capable of conducting electricity.

(1)    Electrically Isolated means the conductive members of a non-dielectric fiber optic cable facility have been conditioned to prevent the transfer of system voltages from one level on a structure to another.  For example, from supply to communications or from one supply level to another.  The appropriate level of isolation may be achieved through electrical or mechanical methods.  Mechanical methods shall be engineered for the voltage and conditions to which the facility is exposed, but not less than a 15” minimum gap, used in conjunction with a non-conductive closure.