Okonite Paper Insulated Lead Covered 1/C cable is recommended for use in underground ducts, direct burial and aerially when lashed to a messenger. PILC cables are used in many circuits where the highest reliability, the longest uninterrupted service life and where the greatest surge, impulse and AC dielectric strengths are desired.
Although not shown as an insulation above 600 Volts in the National Electric Code, it may be approved for use by the local inspector because of its extensive safe use
by utilities for over 60 years. Therefore, PILC cables can be used in industrial or commercial applications with prior notification to and approval by the local inspector.
Also available in other voltage ratings.
Okonite's single conductor PILC cables are available with four different style conductors depending on the application. The four conductor styles are concentric, compressed concentric, compact round and compact segmental
Okonite's impregnated paper insulation consists of the finest electrical grade paper made from the highest quality sulfate processed coniferous wood pulp and the purest grade polybutene dielectric fluid. The paper is manufactured to an Okonite Technical Requirement to assure the electrical properties of low dielectric loss and high dielectric strength; as well as mechanical and physical properties to resist tearing and wrinkling during manufacture and subsequent handling during installation. To maintain a smooth, wrinkle-free precisely gapped tape insulation, Okonite carefully slits its own tape pads into widths tailored for each conductor size and wall thickness. Most important, Okonite uses taping machines with the most precise tape tension controls available today.
The impregnating fluid used is of the medium viscosity polybutene type, also manufactured to an Okonite Technical Requirement. Polybutene dielectric fluids are better than natural petroleum based insulating fluids because they resist aging, have lower and more stable power factor values and possess an inherent tackiness which resists draining of the paper tapes. Okonite's impregnating facilities clay filter and degas the dielectric fluid to provide low power factors and stable ionization levels over a wide range of voltage stresses.
Sheath & Jacket
Okonite's copper bearing lead sheath provides an impervious barrier from the environment; in addition, it provides mechanical protection for the insulation and encapsulates the impregnant. All lead sheaths have the inherent capacity for substantial electrical conductivity under short circuit conditions without requiring a separate ground. Okonite's lead sheaths are applied with a continuous lead extruder under the control of a thickness gauge for uniform wall thickness and concentricity.
The Okolene ® jacket provides mechanical and corrosion protection for the lead sheath and is used in most installations. (Indoor and aerial installations may not require a jacket.)
Okolene is a thermoplastic polyethylene material that resists most chemicals and moisture; it is unaffected by oils below 60°C and has a low coefficient of friction which reduces tensions when pulling through ducts and conduits
Okonite PILC cables are manufactured in accordance with and meet the requirements of AEIC CS1-90, 11th edition.