Is IS 7293 still in use?

No, IS 7293:1974 has been officially withdrawn by BIS. Its provisions have been superseded by the National Building Code (NBC) and CEA Safety Regulations.

What is the main safety device recommended for construction sites?

The use of Earth Leakage Circuit Breakers (ELCBs) or Residual Current Circuit Breakers (RCCBs) for protection against electric shock is a fundamental requirement.

What does this code say about portable tools?

It mandates that portable and transportable apparatus must be robust, properly earthed or double-insulated, and operated at reduced voltage (e.g., 110V or 24V) in hazardous locations.

What is the requirement for temporary wiring?

Cables should be protected from mechanical damage, routed away from traffic, and should not be laid directly on the ground in wet areas. All connections must be made in suitable enclosures.

IS 7293

: 1974

Code of practice for electrical safety in construction

CurrentRareCode of PracticeFire Safety · Construction Safety and Practices

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This code of practice outlines the safety requirements for temporary electrical installations on construction and building sites. It covers aspects like temporary wiring, earthing, protection devices, and the use of portable electrical equipment to prevent electric shock and fire hazards. Note: This standard has been withdrawn.

Lays down safety requirements for electrical installations, equipment, and practices to prevent electrical hazards in construction.

Quick Reference Values

Maximum voltage for portable hand lamps in confined/damp locations24 V

Minimum insulation resistance between conductors1 MΩ

Minimum insulation resistance between any conductor and earth1 MΩ

Typical voltage for temporary site distribution415 V (3-phase) or 240 V (1-phase)

Practical Notes

This standard is withdrawn. For current practice, refer to the National Building Code of India (NBC), particularly Part 8, Section 2, and the Central Electricity Authority (CEA) (Measures relating to Safety and Electric Supply) Regulations.

The core principles, such as mandatory use of Earth Leakage Circuit Breakers (ELCBs) or Residual Current Circuit Breakers (RCCBs) for all temporary power outlets, remain critically important.

Ensure all power tools are either double-insulated (Class II) or properly earthed (Class I), and that all extension cords are heavy-duty and inspected regularly for damage.