SEC Standards Update: New vs Old

Posted on by Engr. Hamid Ali

Saudi Electricity Company (SEC) has issued new standards that mayl soon replace the old ones. These updated codes are essential for engineers, consultants, and contractors working on substations, OHTL (Overhead Transmission Lines), and power system projects in Saudi Arabia.

Key Points to Remember:

  • The new SEC standards take precedence over latest revision of old standards
  • These new standards are almost similar to the latest revisions of old standards — only minor changes may exist, so engineers should cross-check carefully before applying them.
  • The transition shows a clear renaming pattern:
    • TES-P → SEC-ES (Engineering Standards)
    • TMSS → SEC-MSS (Material & Supply Standards)
    • TCS-P → SEC-CS (Construction Standards)

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In the old SEC standards, the first letter indicated the domain:

  • TES → Transmission Engineering Standards
  • TCS → Transmission Construction Standards
  • TMSS → Transmission Material & Supply Standards

Now in the new SEC system, they’ve dropped the “T” and unified the naming as:

  • SEC-ES → Engineering Standards
  • SEC-CS → Construction Standards
  • SEC-MSS → Material & Supply Standards

So the mapping looks like this:

Old PrefixMeaningNew Prefix
TESTransmission Engineering StandardsSEC-ES
TCSTransmission Construction StandardsSEC-CS
TMSSTransmission Material & Supply StandardsSEC-MSS

Below is the reference table comparing New Standards vs Old Standards with their descriptions:

📘 Engineering Standards (SEC-ES)

New StandardOld StandardDescription
SEC-ES-1102-01TES-S-102.01Cyber security system requirements
SEC-ES-1103-02TES-P-103.02Storage battery selection and capacity determination
SEC-ES-1103-03TES-P-103.03Battery charger sizing
SEC-ES-1104-03TES-P-104.03Power cable sizing and selection
SEC-ES-1108-02TES-P-108.02Protection requirements for 110kV through 380kV overhead transmission lines
SEC-ES-1108-11TES-P-108.11Protection system for 11kV and 13.8kV feeders
SEC-ES-1119-01TES-P-119.01Introduction to substation design standards
SEC-ES-1119-02TES-P-119.02Basic design aspects
SEC-ES-1119-07TES-P-119.07Shielding system
SEC-ES-1119-08TES-P-119.08Substation clearances
SEC-ES-1119-09TES-P-119.09Busbars and supporting structures
SEC-ES-1119-10TES-P-119.10Grounding
SEC-ES-1119-11TES-P-119.11Substation insulators
SEC-ES-1119-12TES-P-119.12Application criteria for electrical equipment
SEC-ES-1119-18TES-P-119.18Outdoor equipment foundations
SEC-ES-1119-20TES-P-119.20LV cable raceways and installation practices
SEC-ES-1119-28TES-P-119.28Protection & metering CT/PT sizing calculation
SEC-ES-1119-33TES-P-119.33Substation electrical diagrams
SEC-ES-1119-35TES-P-119.35Station auxiliary transformer sizing
SEC-ES-1122-01TES-P-122.01Basic design requirements for overhead transmission lines
SEC-ES-1122-03TES-P-122.03Conductors and overhead ground wires
SEC-ES-1122-09TES-P-122.09Clearances and right of way requirements

🏗 Construction Standards (SEC-CS)

New StandardOld StandardDescription
SEC-CS-1104-03TCS-P-104.03Trenches and ducts

⚙️ Material & Supply Standards (SEC-MSS)

New StandardOld StandardDescription
SEC-MSS-101-0101-TMSS-01General requirements for all equipment/materials
SEC-MSS-131-0131-TMSS-01Relay and control panels
SEC-MSS-131-0231-TMSS-02Auxiliary AC/DC panels
SEC-MSS-141-0441-TMSS-04Automatic voltage controller (AVC) for power transformer autotransformer
SEC-MSS-148-1848-TMSS-18Closed circuit television (CCTV) surveillance & SAC system
SEC-MSS-150-0150-TMSS-01Conventional and low power current transformers 11kV–380kV
SEC-MSS-153-0253-TMSS-02Power transformers rated above 100MVA
SEC-MSS-160-02—Pre-fabricated substation 13.8kV and above applications
SEC-MSS-170-0270-TMSS-02Chainlink fence

🔎 Conclusion

  • New SEC standards are now the official reference and will replace old standards soon.
  • They are mostly similar to the latest revisions of old standards but may contain minor changes → always check details carefully.
  • Naming convention is now standardized: SEC-ES (Engineering), SEC-CS (Construction), SEC-MSS (Material & Supply).

⚡ For anyone working on substations, transmission lines, or equipment supply, aligning with the new SEC standards is mandatory moving forward.

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