SNT 2.04.20-2004 PDF

Full title and description

SNT 2.04.20-2004 — Instructions for design of electrical power and lighting equipment. Design standards. A national technical instruction that sets out norms, calculation methods and practical requirements for the design, layout and documentation of power and lighting systems for industrial, commercial and public buildings.

Abstract

This standard provides mandatory/recommendatory rules and numerical design norms for selection and arrangement of power distribution equipment, lighting installation systems, protective devices, earthing and bonding, short‑circuit and load calculations, and documentation required for project approval. It is intended to harmonize design practice, ensure safety, energy efficiency and adequate lighting quality, and to provide designers with consistent algorithms and tables for typical installations.

General information

• Status: Active (listed in public standards/catalogue sources).
• Publication date: 2004.
• Publisher: National standards authority for the SNT series (Turkmenistan national standards / State Committee / agency responsible for SNT publication).
• ICS / categories: 29 — Electrical engineering; relevant subcategories include 29.020 (electrical engineering in general) and 29.140 (lamps and lighting installation systems).
• Edition / version: 2004 edition (SNT 2.04.20-2004).
• Number of pages: 52 (standard electronic format, typical catalogue listing).

Scope

SNT 2.04.20-2004 covers technical requirements and recommended calculation procedures for the design of low‑ and medium‑voltage power distribution and lighting installations for industrial, public and commercial buildings. The scope includes sizing of conductors and protective devices, short‑circuit and load calculations, earthing/grounding and equipotential bonding, selection and layout of switchgear and distribution panels, indoor and outdoor lighting design (illumination levels, luminaires, mounting and controls), safety measures and documentation to be included in project submissions.

Key topics and requirements

• Principles of electrical power distribution and typical single‑line diagrams for industrial and commercial projects.
• Methods for load estimation, diversity factors and load grouping.
• Short‑circuit calculation methods and requirements for protective device coordination.
• Sizing of conductors and selection of cables, trunking and raceways.
• Requirements for earthing, bonding, lightning protection interfaces and fault clearing.
• Lighting design norms: recommended illuminance levels by task, lumen maintenance, uniformity and glare control.
• Selection and placement of luminaires, emergency and safety lighting requirements.
• Safety, access for maintenance, labeling and documentation of electrical rooms and panels.
• Required drawings, calculation sheets and technical specifications for permit and construction stages.

Typical use and users

Primary users are electrical design engineers, consulting firms, electrical contractors, project architects, building services engineers and regulatory authorities involved in review and approval of electrical and lighting designs. The standard is used during conceptual and detailed design stages, for preparing tender documentation, and to verify compliance at construction and commissioning.

Related standards

Documents and standards frequently used alongside SNT 2.04.20-2004 include older regional/Soviet design instructions for power and lighting, national electrical installation rules (equivalent to PUE / local electrical installation codes), related SNT series items (for example adjacent SNT items in the 2.04 / 2.05 groups), and relevant international standards such as IEC/EN documents on electrical installations, switchgear, and lighting (for technical details and product tests).

Keywords

SNT 2.04.20-2004; СНТ 2.04.20-2004; electrical design; power distribution; lighting design; earthing; short‑circuit calculation; protective devices; cables; luminaires; Turkmenistan standards; design norms.

FAQ

Q: What is this standard?

A: SNT 2.04.20-2004 is a national instruction document setting out design norms and practical requirements for electrical power and lighting equipment and systems used in industrial, commercial and public building projects.

Q: What does it cover?

A: It covers load estimation, conductor and cable sizing, short‑circuit and coordination calculations, protective device selection, earthing and bonding, indoor and outdoor lighting norms (recommended illuminance and uniformity), equipment layout, safety and the project documentation required for approvals and construction.

Q: Who typically uses it?

A: Electrical engineers and designers, consulting practices, contractors, architects and building services professionals, plus regulatory reviewers and project approvers in jurisdictions that adopt the SNT series.

Q: Is it current or superseded?

A: The document is dated 2004 and catalogue listings indicate it as the 2004 edition. Users should check with the national standards body or current national catalogue to confirm whether a later revision or replacement has been published for their specific jurisdiction before relying on it for new designs.

Q: Is it part of a series?

A: Yes — it is part of the SNT series of technical norms and instructions (the SNT family) covering construction, engineering and design topics; related SNT items address adjacent disciplines and installation types.

Q: What are the key keywords?

A: Electrical design, power distribution, lighting design, earthing, protective devices, short‑circuit calculations, cables, luminaires, SNT, СНТ, Turkmenistan standards.