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ICEA S-95-658/NEMA WC70 is an industry standard jointly published by the Insulated Cable Engineers Association (ICEA) and the National Electrical Manufacturers Association (NEMA). It establishes specifications for the construction, testing, and performance of 600-volt and 2,000-volt non-shielded, single-conductor and multi-conductor power cables rated for use in industrial and commercial applications. One of its key provisions defines the minimum bend radius requirements for these cables to ensure mechanical integrity during installation [Southwire; Kris-Tech Wire; Prysmian].
Scope and Purpose
The standard applies to cables with thermoset or thermoplastic insulation and jackets, including those with armor, fillers, and bedding materials. Its bend radius guidelines are intended to prevent conductor damage, insulation cracking, or deformation of the cable core during pulling, bending, or handling. Compliance helps maintain electrical performance, mechanical strength, and long-term reliability of the cable installation.
Key Requirements for Minimum Bend Radius
- Bend radius is expressed as a multiple of the cable’s overall diameter (O.D.).
- Typical values range from 8× to 12× O.D. for single- and multi-conductor cables without shielding, depending on cable construction.
- Cables with individual shields, concentric neutrals, or armor may require larger bend radii, often 12× O.D. or greater.
- For portable cords or flexible constructions, smaller multiples may apply per manufacturer data, but not less than ICEA minimums.
- Measurements are taken from the inside curve of the cable bend.
Quick Reference – Minimum Bend Radius Multipliers (ICEA S-95-658/NEMA WC70)
| Cable Construction | Typical Minimum Bend Radius (Multiple of O.D.) |
|---|---|
| Single-Conductor, Unshielded | 8× O.D. |
| Multi-Conductor, Unshielded | 10× O.D. |
| Single-Conductor, Shielded | 12× O.D. |
| Multi-Conductor, Shielded | 12× O.D. |
| Armored Cable | 12×–15× O.D. |
| Portable Cord/Flexible Cable | Not less than ICEA minimums (often smaller multiples allowed by manufacturer) |
Source: Southwire – Minimum Bend Radius Technical Document, Table 1, per ICEA S-95-658/NEMA WC70; Kris-Tech Wire – Understanding Wire Bending Radius; Prysmian Rail & Transit Cable Specifications.
Example Application
If a cable has an O.D. of 1.50 inches and the minimum bend radius per ICEA S-95-658/NEMA WC70 is 10× O.D., the smallest allowable inside bend radius is 15 inches.
Conclusion
ICEA S-95-658/NEMA WC70 provides industry-recognized construction and performance requirements for low- and medium-voltage power cables, including critical guidance for minimum bend radius. Following these guidelines prevents damage during installation and ensures the cable meets its designed service life, making them a key reference for engineers, contractors, and installers working with industrial and commercial power systems [Southwire; Kris-Tech Wire; Prysmian].
