GOST 7229-76 PDF

Full title and description

GOST 7229-76 — "Кабели, провода и шнуры. Метод определения электрического сопротивления токопроводящих жил и проводников" (Cables, wires and cords — Method of measurement (determination) of electrical resistance of conductors). The standard specifies procedures, sample preparation and environmental conditions for measuring the electrical resistance of current-carrying conductors used in cable, wire and cord products.

Abstract

This interstate (USSR) standard establishes a standardized laboratory method to determine the electrical (DC) resistance of conductive cores and conductors in cables, wires and cords. It covers sampling, sample straightening and conditioning, measurement methods (including provisions for temperature control and correction), permissible measurement errors and required reporting of results. The method is intended to ensure comparable, repeatable resistance measurements for quality control, acceptance testing and investigations.

General information

• Status: Dействует (active); срок действия ограничения снят (restriction removed by protocol 1993).
• Publication date: Approved 29 July 1976; introduced into effect 1 January 1978 (replaces GOST 7229-67).
• Publisher: Госстандарт СССР (State Committee for Standards); reprinted by Изд-во стандартов, Moscow (1988 reissue).
• ICS / categories: OKC/ICS related to cables and conductors — ОКС 29.060.01; KGS Е49 (cable & wire sector classification).
• Edition / version: Original GOST 7229-76; Amendment No.1 (1981); reissued edition Jan 1988 (bibliographic reprint noted).
• Number of pages: Typically published as a short procedural standard (commonly shown as 6 pages in electronic catalogs; some library holdings list an 8-page reprint edition).

Scope

The standard applies to electrical resistance measurements of current-carrying conductors (single and multi‑stranded) used in cables, wires and flexible cords. It defines: sampling methods and sample lengths; mechanical preparation (straightening) to avoid cross‑section changes; ambient conditioning (stabilisation time, recommended room temperature and humidity limits); measurement circuits and connections to minimise contact and lead resistances; temperature measurement and correction procedures; and acceptable measurement uncertainty for routine and dispute-resolution testing. The procedure is intended for laboratory and production test environments.

Key topics and requirements

• Sample selection and preparation — straightening samples without altering conductor cross-section; specified sample lengths for different tests.
• Conditioning — recommended stabilization in test environment (commonly a minimum of 6 hours) and limits on allowable ambient temperature variation before measurement.
• Measurement method — low‑resistance measurement technique (four‑terminal/bridge approaches implicitly required to reduce contact and lead errors) and specified current densities for testing.
• Temperature control and correction — measuring ambient/sample temperature, using temperature coefficients or tables to normalize results to reference temperature.
• Accuracy, permissible errors and reporting — declared measurement uncertainties, calibration and verification of instruments, and required test record contents.
• Reference tables and annexes — temperature multipliers for common conductor materials (copper, aluminium) and guidance for converting measured values.

Typical use and users

Primary users are cable and wire manufacturers, acceptance and type‑testing laboratories, quality control engineers, metrology services and procurement/inspection bodies. The standard is used for production control, incoming/outgoing inspection, type approval testing, failure investigations and to verify compliance with technical specifications for conductor resistance.

Related standards

Related documents include the predecessor GOST 7229-67 and associated cable/wire normative family ("Кабели, провода и шнуры" series). It is linked to other GOSTs that set electrical and mechanical requirements for cable products and to regional/SEV intergovernmental references (СТ СЭВ 2783-80) noted in bibliographic records. Users commonly consult complementary standards on insulation, conductor dimensions, and test methods for dielectric, mechanical and fire properties.

Keywords

GOST 7229-76; cables; wires; cords; electrical resistance; conductor resistance measurement; temperature correction; sample preparation; metrology; cable testing.

FAQ

Q: What is this standard?

A: GOST 7229-76 is a Soviet (interstate) standard that defines the method for determining the electrical (DC) resistance of current‑carrying conductors in cables, wires and cords, including sampling, measurement technique and temperature correction.

Q: What does it cover?

A: It covers sample selection and preparation, environmental conditioning, low‑resistance measurement practice to minimise contact/lead errors, temperature measurement and correction, accuracy requirements and reporting format for results.

Q: Who typically uses it?

A: Cable and wire manufacturers, independent and factory laboratories, QA/QC engineers, metrology centres and procurement/inspection authorities for acceptance and verification testing.

Q: Is it current or superseded?

A: The standard was approved on 29 July 1976 and introduced 1 January 1978. Catalogs and normative databases indicate the document is in force (restriction on application was removed by protocol in 1993) and it appears in reissued collections; users should verify whether a more recent national or industry standard (GOST R or international standard) has been adopted for their contract or regulatory context.

Q: Is it part of a series?

A: Yes — it is one of the standards in the "Кабели, провода и шнуры" family and references/relates to other GOSTs on cable construction, testing and performance; bibliographic records also show the ST SEV intergovernmental identifier (СТ СЭВ 2783-80).

Q: What are the key keywords?

A: Conductor resistance, cable testing, wires, cords, temperature correction, low‑resistance measurement, sampling, metrology.