GOST 21130-75 PDF

Full title and description

GOST 21130-75 — Изделия электротехнические. Зажимы заземляющие и знаки заземления. Конструкция и размеры (English: Electrical items — Earth terminals and earth signs — Design and dimensions).

Abstract

Standard specifying construction, dimensional series, marking and basic material/finish recommendations for earth (grounding) clamps/terminals and earth identification signs used on electrical equipment and apparatus (general-purpose, explosion-proof and mining products). It establishes design features, mounting arrangements and sizes for standardized earth terminals and associated identification signs.

General information

• Status: Listed in multiple national/regional registries as in force / действующий; some catalogs and national libraries indicate historical withdrawals or country-specific cancellations—limitation of effectiveness was reported lifted by decree in 1990.
• Publication date: Introduced mid‑1976 (effective from 30 June / 1 July 1976).
• Publisher: Approved by the State Committee for Standards (Gosstandart) of the USSR / issued as an interstate/national GOST.
• ICS / categories: OKC/ICS classification E78; 29.120.99 (electrical fittings / other electrical fittings).
• Edition / version: Original designation ГОСТ 21130-75 with multiple amendments noted in registries (amendments published 1977, 1979, 1981, 1986, 1990 and listed revisions).
• Number of pages: Recorded in major registries as 27 pages (some commercial copies/catalogs report slightly different pagination).

Scope

Applies to grounding (earth) clamps/terminals and to earth identification signs that are fixed near grounding connection points on enclosures, cable armouring, shields and terminal points of electrical apparatus. Excludes certain linear grounding clamps, portable grounding devices, and grounding items whose manufacture is governed by special sectoral rules (e.g., some radio-engineering or shipbuilding products).

Key topics and requirements

• Design and geometric dimensions for a range of standardized earth terminals and signs (shape, diameters, thicknesses, hole patterns and mounting features).
• Material recommendations and corrosion-protection considerations for terminals and hardware.
• Marking and identification requirements for earth signs (standardized symbol, permitted sizes, and placement in relation to the terminal).
• Mechanical strength, attachment and fastening details for reliable electrical and mechanical contact.
• References and harmonization notes showing compatibility/consistency with relevant IEC practices for earth/ground symbols and some installation aspects.

Typical use and users

Used by electrical‑equipment manufacturers, component fabricators (terminals and signs), designers and engineers specifying enclosure and cable‑entry grounding points, safety and compliance officers, testing and certification bodies, and procurement specialists sourcing standardized grounding hardware. Also used by maintenance teams for replacement/repair to ensure interchangeability and correct marking.

Related standards

Cross‑references to numerous GOSTs for fasteners, materials and safety: e.g., standards for screws/bolts/nuts and washers, corrosion protection, copper/brass alloys, and other electro‑technical normative documents. The standard is listed alongside and references many GOST documents (examples include ГОСТ 1491, ГОСТ 1759.x, ГОСТ 3042/5264 and others) and is noted to align with certain IEC symbol and marking practices.

Keywords

GOST 21130-75, earth terminal, grounding clamp, earth sign, grounding symbol, electrical fittings, design and dimensions, grounding marking, зажимы заземляющие, знак заземления.

FAQ

Q: What is this standard?

A: A Soviet / interstate GOST that defines design, dimensions and basic requirements for earth (grounding) terminals and the accompanying earth identification signs used on electrical equipment.

Q: What does it cover?

A: Constructional drawings, dimensional series, mounting features, marking/placement of earth signs and material/finish recommendations for grounding clamps and signs; it excludes certain special-purpose grounding clamps governed by other rules.

Q: Who typically uses it?

A: Manufacturers of electrical equipment and components, designers and engineers, regulatory and conformity assessment bodies, procurement and maintenance personnel dealing with standardized grounding hardware.

Q: Is it current or superseded?

A: Registries and commercial standards libraries commonly list ГОСТ 21130-75 as in force (with amendments) and note that the original limitation of effectiveness was removed by a 1990 decree; however, some national catalogs or country-specific libraries (for example certain national withdrawals) may show it as cancelled for that jurisdiction. Users should check the applicable national/regional registry for the definitive legal status before relying on it for regulatory compliance.

Q: Is it part of a series?

A: It is part of the family of GOST standards covering electrical fittings and safety/installation practices (classified under E78 / 29.120) and cross‑references many other GOST documents for fasteners, materials and protective coatings; it also contains notes on alignment with relevant IEC symbol standards.

Q: What are the key keywords?

A: Earth terminal, grounding clamp, earth sign, grounding symbol, electrical fittings, GOST 21130-75, design and dimensions.