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CSA C22.2 No. 247-14 (errata 2015): Technical Requirements for Fiber Optic Cables on Electric Power Lines
Comprehensive Guide to the Canadian Standard for OPGW and ADSS Cables in Utility Applications
CSA C22.2 No. 247-14 (errata 2015) is a key Canadian standard developed by the Canadian Standards Association (CSA) for optical fiber cables installed on electric power lines. It addresses the unique challenges of deploying fiber optic communications within high-voltage environments, focusing on two dominant cable types: Optical Ground Wire (OPGW) and All-Dielectric Self-Supporting (ADSS) cables. The 2015 errata provides technical clarifications and corrections to the 2014 edition, ensuring consistent application across the industry. This article offers an in-depth look at the standard’s scope, technical requirements, implementation highlights, and compliance notes for engineers, manufacturers, and utility personnel.
Scope of the Standard
CSA C22.2 No. 247-14 applies to optical fiber cables intended for use on electric power lines operating at voltages above 1 kV. It covers both OPGW cables, which integrate optical fibers into a metallic ground wire, and ADSS cables, which are fully dielectric and designed to withstand the electrical environment near power conductors. The standard specifies construction, performance, and test methods to ensure safe and reliable operation under mechanical, electrical, and environmental stresses. It is part of the C22.2 series of Canadian electrical safety standards, making it a mandatory requirement for equipment sold or installed in Canada.
Key Scope Clarifications (errata 2015): The 2015 errata refined the definitions of OPGW and ADSS cable categories and added notes on the exclusion of optical fiber cables not intended for direct attachment to power line structures (e.g., buried or duct cables covered by other C22.2 standards).
Technical Requirements
Construction and Materials
OPGW cables must consist of one or more optical units (loose tubes or tight buffers) embedded within a metallic shield wire that provides grounding and lightning protection. The metallic components must comply with CSA C22.2 No. 0.4 for grounding connections. ADSS cables must be entirely dielectric, with aramid yarn strength members and a UV-resistant outer sheath to prevent tracking and aging in the high electric field environment.
Mechanical Performance
Cables must undergo tensile loading tests to verify that the optical fibers experience no attenuation change beyond specified limits when subjected to rated tensile loads (typically 60% of the cable’s breaking strength). Other mechanical tests include impact, crush, and repeated bending. The errata 2015 introduced tighter tolerances for test cycles and acceptance criteria.
Electrical Performance
For OPGW, electrical continuity and resistance of the metallic components are verified to ensure proper grounding and lightning current handling. ADSS cables must be tested for tracking resistance and ability to withstand induced voltages without surface degradation. The standard references ANSI/IEEE 1138 for some electrical tests, but the 2015 errata clarified the specific test durations and voltage levels.
Environmental & Optical Performance
Temperature cycling, water penetration, and cable aging tests are required. Optical attenuation must meet IEC 60793-2 category B (single-mode) or A1 (multimode) requirements. The table below summarizes key performance requirements for typical 48-fiber cables.
| Parameter | OPGW Requirement | ADSS Requirement |
|---|---|---|
| Rated Tensile Load (RTS) | ≥ 40 kN (typical) | ≥ 30 kN (typical) |
| Attenuation Change after Tensile Test | ≤ 0.05 dB/km | ≤ 0.10 dB/km |
| Temperature Range (operation) | −40 °C to +85 °C | −40 °C to +70 °C |
| Water Penetration (1 m head, 24 h) | No water at far end | No water at far end |
| Tracking Resistance (ADSS only) | N/A | ≥ 2.5 kV (wet tracking test) |
| Grounding Connection Resistance (OPGW) | < 0.1 Ω (per joint) | N/A |
Important Note on ADSS Tracking: The 2015 errata removed an outdated test method for tracking resistance and replaced it with a more severe dry arc test aligned with IEC 60794-4. Manufacturers should verify that their cable designs meet the updated requirements.
Implementation Highlights
Manufacturers seeking certification to CSA C22.2 No. 247-14 must submit sample cables to a CSA-recognized laboratory. Testing covers all mechanical, electrical, and optical requirements. For OPGW, special attention is paid to the interface between optical units and the metallic structure to avoid fiber stress during conductor sag. For ADSS, the sheath material must pass UV weathering and tracking tests. The standard also requires production testing on every cable length, including continuity, jacket integrity, and optical performance verification.
The 2015 errata introduced a more stringent requirement for the marking of cables: each length must be permanently marked with the standard number, cable type, year of manufacture, and maximum installation tension. This facilitates traceability and helps field crews respect tension limits.
Tip for Utilities: When specifying cables for new installations, confirm that the manufacturer’s certification covers the 2015 errata edition (look for “C22.2 No. 247-14 (including 2015 errata)” on the CSA mark). This ensures the latest safety and performance criteria are met.
Compliance and Certification Notes
In Canada, compliance with CSA C22.2 No. 247-14 (errata 2015) is mandatory under provincial electrical codes for all fiber optic cables installed on overhead power lines. Certification is typically issued by organizations such as CSA Group, ul (Intertek), or other accredited NRTLs that recognize the standard. The 2015 errata is an integral part of the standard; manufacturers must update their documentation and test records to reflect the corrected clauses.
For international comparisons, CSA C22.2 No. 247-14 largely aligns with IEC 60794-4 and IEEE 1138, but includes additional mechanical tests specific to cold climates and ice loading conditions typical in Canada. Importers should verify equivalency if sourcing cables certified to non-Canadian standards.
Non-Compliance Risks: Use of cables not certified to C22.2 No. 247-14 may result in rejection during regulatory inspection and could lead to safety violations. Additionally, insurers may not cover failures caused by non-compliant cables. Always require a valid certificate of compliance from the manufacturer.
Frequently Asked Questions
Q: What is the main difference between OPGW and ADSS cables as defined in this standard?
A: OPGW combines optical fibers with a metallic ground wire that serves both as a communications link and as a lightning/grounding conductor. ADSS cables are completely dielectric (no metal) and rely on aramid or similar non-conductive strength members; they are installed on power lines but not intended to carry electrical current. The standard treats each type with specific mechanical and electrical tests based on their design.
A: OPGW combines optical fibers with a metallic ground wire that serves both as a communications link and as a lightning/grounding conductor. ADSS cables are completely dielectric (no metal) and rely on aramid or similar non-conductive strength members; they are installed on power lines but not intended to carry electrical current. The standard treats each type with specific mechanical and electrical tests based on their design.
Q: Did the 2015 errata change any scope or application criteria?
A: Yes, the errata clarified that cables intended solely for buried or duct installation adjacent to power lines are not covered by this standard but by other C22.2 standards (such as No. 234). It also refined the test voltage for ADSS tracking resistance and corrected a table referencing optical fiber categories.
A: Yes, the errata clarified that cables intended solely for buried or duct installation adjacent to power lines are not covered by this standard but by other C22.2 standards (such as No. 234). It also refined the test voltage for ADSS tracking resistance and corrected a table referencing optical fiber categories.
Q: Is there a transition period for compliance with the 2015 errata?
A: CSA standards typically become effective on the date of publication. However, certification bodies usually allow a reasonable phase-in period (often 12 months) during which manufacturers can have their products reassessed to the updated requirements. It is advisable to contact your certifier for a timeline specific to your products.
A: CSA standards typically become effective on the date of publication. However, certification bodies usually allow a reasonable phase-in period (often 12 months) during which manufacturers can have their products reassessed to the updated requirements. It is advisable to contact your certifier for a timeline specific to your products.
Q: Do I need to retest my existing cable designs if they were certified to the 2014 edition?
A: If the errata introduced new or more stringent tests (e.g., the updated tracking test for ADSS), those tests must be repeated for continued certification. For designs unaffected by the changes, a simple documentation update may suffice. Consult with your certification body for a detailed gap analysis.
A: If the errata introduced new or more stringent tests (e.g., the updated tracking test for ADSS), those tests must be repeated for continued certification. For designs unaffected by the changes, a simple documentation update may suffice. Consult with your certification body for a detailed gap analysis.
Last updated for the 2026 review cycle. This article is for informational purposes and does not substitute the official standard text. Users should refer to CSA C22.2 No. 247-14 errata 2015 for authoritative requirements.