IMSA 20-1
STRANDED CONDUCTOR
Polyethylene Insulation
Polyethylene Jacket
75°C, 600 Volt
　

APPLICATIONS:
For use in signal systems, and approved for
installation in underground ducts or as aerial cable
supported by a messenger.
　

SPECIFICATIONS:
1. CONDUCTORS: Bare, stranded, annealed copper, conforming to the requirements of
ASTM B-3, latest edition.
2. INSULATION: The insulation compound before application to the conductors is heatstabilized
polyethylene, conforming to the melt-index requirements of ASTM D-1248, 65T,
Class B, Grade 4. After application to the conductors, the insulation meets all
requirements of the latest IMSA Specification No. 20-1 when tested in accordance with
ASTM D-1351, latest edition, and D-470, latest edition.
3. ASSEMBLY: The insulated conductors are laid up in compact cable form, and bound with
a spiral wrap of moisture-resistant tape applied to lap at least 10 percent of its width.
4. OVERALL JACKET: High molecular weight polyethylene, meeting the requirements of
ASTM D-1248, 65T, for Dielectric Material, Class C, Grade 5, J3.
5. STANDARDS: The completed cable meets or exceeds the latest International Municipal
Signal Association (IMSA) Specification No. 20-1.
6. TEMPERATURE: 75°C
7. VOLTAGE: 600 Volts