Continuously Transposed Cable (CTC)
When reliability matters most, Essex Solutions’ CTC capabilities help customers meet demanding performance requirements with confidence. Through technical expertise, manufacturing consistency, and application-specific collaboration, we support the long-term dependability modern energy infrastructure requires.
Copper
Rectangular
North America
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Continuously Transposed Cable (CTC) consists of a number of rectangular, film insulated conductors assembled and typically over-wrapped with layers of insulating material. Conductors are arranged side by side in two stacks and transposed through a special process so each wire occupies every possible position within a cycle. The number of conductors is usually an odd number ranging from 5 to 79 strands (or up to 61 for Twin CTC configurations). Twin CTC consists of two identical CTCs combined into one assembly, improving regulating phase performance in large power transformers. The cycle length depends on transformer winding diameter and conductor dimensions.
Thermal Class:
120°C, 200°C
Size Range:
Width: 2.80 – 12.80 mm, Thickness: 1.00 – 3.30 mm, Cross Section: 3.20 – 40 mm², Width/Thickness Ratio: 1.5:1 – 8:1, Strands: 5 – 79 (5 – 61 for Twin CTC)
Insulation:
Enamel: 60 Micron PVA, PEI / PAI
Paper: Pure Cellulose, Thermally Upgraded Paper, Nomex® (paper or perforated tape) Additional: Netting, Cordex, option for Twin CTC with/without flat shielding conductors
Standards:
NEMA: MW 18, MW 36-C, MW 87-C, IEC: 60554-3-5 (Cellulose Paper), 60641 (Pressboard), 60317-18, 60317-29, GB: 33597
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