Revised Standard from Last Update.

1. SCOPE

This Code gives the rules for the design, erection, and verification of electrical installations. The rules are intended to provide for the safety of persons, livestock and property against dangers and damage which may arise in the reasonable use of electrical installations and to provide for the proper functioning of those installations.

1.1 General

This standard applies to the design, erection and verification of electrical installations such as those of:

a) residential premises,

b) commercial premises,

c) public premises,

d) industrial premises,

e) agricultural and horticultural premises,

f) photovoltaic systems, and

g) low-voltage generating sets.

NOTE - “premises” covers the land and all facilities including buildings belonging to it.

1.2 This standard include requirements for:

a) circuits supplied at normal voltage upto and including 1 000V a.c. or 1 500V d.c. For a.c., the preferred frequencies which are taken into account in this standard are 50 Hz, 60 Hz and 400 Hz.The use of other frequencies for special purposes is not excluded.

b) circuits, other than the internal wiring of equipment, operating at voltage exceeding 1 000 V a.c., for example discharge lighting, electro static precipitator, X-ray and scanning apparatus, high voltage electrode boilers.

c) wiring systems and cables not specifically covered by the standards for appliances, namely product standards.

d) all consumer installations external to buildings.

e) fixed wiring for information and communication technology, signalling, control and the like (excluding internal wiring of equipment).

f) any extension, namely, additions and alteration to installations and also parts of the existing installation affected by an addition or alteration.

1.2.1 This standard applies to items of electrical equipment only, so far as, its selection and application in the building electrical installation are concerned. The rules in this standard do not deal with the requirements for the factory-built construction of electrical equipment, namely, type tested (TT) and partially type tested (PTT), Switchgear and Controlgear Assemblies, Distribution Boards, Fuse Distribution Boards, Circuit Breaker Distribution Boards, Bus-bar Trunking Systems (busways), electric supply track systems for luminaries, power track system intended for wall and ceiling mounting, boxes and enclosures for electrical accessories for house-hold and similar fixed electrical installations, electricity control units known as Consumer Units or Consumer Control Units. The factory-built assemblies of these electrical equipment are required to comply with IS 8623 (all parts), IS 14772, BSEN 60439-1, BSEN 60439-2, BSEN 60439-3. BSEN 60439-4, BSEN 60570, BSEN 60570-2-1, BSEN 60670-1, BSEN 60670-22, IEC 60670-21, BSEN 61534-21 and other relevant Indian Standards/IEC Standards.

1.2.2 This standard does not apply to the following electrical installations:

a) construction sites, exhibitions, shows, fairgrounds and other installations for temporary purposes including professional stage and broadcast applications;

b) marinas;

c) external lighting and similar installations;

d) mobile or transportable units;

e) highway equipment and street furniture;

f) medical locations;

g) operating and maintenance gangways;

h) pre-fabricated building;

j) systems for the distribution of electricity to the public by Electricity Distribution Companies governed by the Central Electricity Authority Regulations made under the Electricity Act, 2003;

k) power generation and transmission for such distribution system in (a);

m) railway traction equipment, rolling stock and signalling equipment;

n) electrical equipment of motor vehicles, except those to which the requirements of the regulation concerning mobile units are applicable;

p) electrical equipment on board ships;

q) electrical equipment of mobile and fixed offshore installations;

r) electrical equipment in aircraft;

s) those aspects of mines and quarries which are specially covered by statutory Regulation under Mines Act, 1952 (35 of 1952);

t) radio interference suppression equipment, except so far as, it affects safety of the electrical installation;

u) external lighting protection systems (LPS) for buildings and structures covered under IS/IEC 62305;

v) safety machinery and electric equipment of machinery covered under Factory Act, 1948 and other Special Publications of BIS;

w) those aspects of lift installations which are covered under relevant parts of statutory Rules made under Helps Act framed by various states in India and also covered by the various Indian Standards on Lifts and Escalators formulated by BIS;

x) electric fences covered by relevant Indian Standard relating to Electrical safety in consumer’s appliances; and

y) public street-lighting installation which are part of distribution system by Public utility under the Electricity Act, 2003.

1.3 Installation of Premises Subject to Licensing

For installation of premises over which a licensing or other authority exercises a statutory control, the requirements of that authority shall be as ascertained and complied with in the design and execution of the installation.

1.3.1 The relationship with the Central Electricity Authority (Measure Relating to Safety and Electric Supply) Regulations 2010, and Regulations made by appropriate Electricity Regulatory Commission under Electrically Act, 2003 is as given below:

The legal status of this standard, including other Codes of Practice Standards of the Bureau of Indian Standard or National Electrical Code, is explained in sub-regulation (2) of Regulation 12 of the Central Electricity Authority (Measure Relating to Safety and Electric Supply) Regulations, 2010. Hence, these Rules may be used to satisfy any statutory approving authority under the Electricity Act, 2003 or in any Court of Law in evidence to claim compliance with a statutory requirement.

The rules in this Code, however, are intended to supplement the Statutory Regulations made by the appropriate Electricity Regulatory Commission and in the event of any inconsistency; the provisions of those regulations made by the appropriate Electricity Regulatory Commission shall prevail. The Electricity Regulatory Commissions in the Supply Code and Distribution Code made by them generally include a deeming provision that the statutory requirements in Supply Code and Distribution Code are duly observed by users and consumers of electricity, if the electrical installation owned by them are constructed, installed, protected, inspected, tested, operated, worked and maintained according to this Indian Standard besides, complying with the provisions of sub regulation (1), (3) and (4) of the Central Electricity Authority (Measures Relating to Safety and Electric Supply) Regulations, 2010 and all other applicable statutory regulations made under the Electricity Act, 2003.

2. REFERENCES

1293 : 2005 Plugs and socket - outlets of rated voltage up to and including 250 volts and rated current up to 16 amperes

1885 Electrotechnical vocabulary:

(Part 37) : 1993 Part 37 Tariffs for Electricity (first revision)

(Part 70) : 1993/IEC 60050 (604) : 1987 Generation, transmission and distribution of electricity - Operation

8130 : 2013 Conductors for insulated electric cables and flexible cords (second revision)

8623 (Part 1) : 1993/IEC 60439-1(1985) Low-voltage switchgear and and controlgear assemblies: Part 1 Type-tested and partially type-tested assemblies

8623 (Part 2) : 1993/IEC 60439-2 (1987) Low-voltage switchgear and controlgear assemblies: Part 2 Particular requirements for busbar trunking systems (busways)

9000 (Part 11) : 1983 Basic environmental testing procedures for electronic and electrical items: Part 11 Salt mist test

9537 (All Parts) Conduits for electrical installations - Specification

10322 (All Parts) Luminaires

11731 (All Parts) Methods of test for determination of the flammability of solid electrical insulating materials when exposed to an igniting source

12032 (All Parts) Graphical symbols for use on equipment

12360 : 1988 Voltage bands for electrical installations including preferred voltages and frequency

13234 (Part 0) : 2016 Short-circuit currents in threephase a.c. systems: Part 0 Calculation of currents (first revision)

13252 (Part 1) : 2010/IEC 60950-1 : 2005 Information technology equipment - Safety: Part 1 General requirements

13703 Low voltage fuses for voltages not exceeding 1 000 V ac or 1 500 V d.c.:

(Part 2/Sec 1) : 1993 Fuses for use by authorized persons, Section 1 Supplementary requirements

(Part 4) : 1993 Supplementary requirements for fuse-links for the protection of semiconductor devices

13736 (All Parts) Classification of environmental conditions

14700 Electromagnetic compatibility (EMC):

(Part 4/Sec 2) : 2008 Testing and measurement techniques, Section 2 Electrostatic discharge immunity test

(Part 4/Sec 3) : 2008 Testing and measurement techniques, Section 3 Radiated, radio-frequency, electromagnetic field immunity test

(Part 4/Sec 4) : 2008 Testing and measurement techniques, Section 4 Electrical fast transient/burst immunity test

(Part 4/Sec 6) : 2016 Testing and measurement techniques, Section 6 Immunity to conducted disturbances, induced by radio-frequency fields

(Part 4/Sec 8) : 2008 Testing and measurement techniques, Section 8 Power frequency magnetic field immunity test

(Part 4/Sec 12) : 2008 Testing and measurement techniques, Section 12 Oscillatory waves immunity test

(Part 6/Sec 1) : 2008 Generic standards, Section 1:Immunity for residential, commercial and light-industrial environments

(Part 6/Sec 2) : 2008 Generic standards, Section 2 Immunity for industrial environments

(Part 6/Sec 3) : 2002 Generic standards, Section 3 Emission standard for residential, commercial and light-industrial environments

14772 : 2000 Enclosures for accessories for household and similar fixed electrical installations

14927 (All Parts) Cable trunking and ducting systems for electrical installations

14930 (All Parts) Conduit systems for electrical installations

15382 (Part 1) : 2014 Insulation co-ordination for equipment within low-voltage systems: Part 1 Principles, requirements and tests 15697 Capacitors for use in tubular fluorescent and other discharge lamp circuits:

(Part 1) : 2013 Safety requirements

(Part 2) : 2013 Performance requirements

16242 Uninterruptible power systems (UPS):

(Part 1) : 2014 General and safety requirements

(Part 3) : 2014/IEC 62040-3 : 2011 Method of specifying the performance and test requirements

16463 (Part 12):2016/IEC 61643-12 : 2008 Surge-protective device connected to low-voltage power distribution systems: Part 12 Performance requirements and testing methods

IEC 60050-195 International Electrotechnical Vocabulary - Part 195: Earthing and protection against electric shock

IEC 60050-826 International Electrotechnical Vocabulary - Part 826: Electrical installations

IEC 60073 : 1996 Basic and safety principles for man-machine interface, marking and identification - Coding principles for indication devices and actuators

IS/IEC 60079 (All Parts) Electrical apparatus for explosive gas atmospheres

IEC 60245-3 Rubber insulated cables - Rated voltages up to and including 450/750 V - Part 3: Heat resistant silicone insulated cables

IEC 60255-22-1 : Electrical relays - Part 22: 1988 Electrical disturbance tests for measuring relays and protection equipment, Section 1: 1 MHz burst disturbance tests

IEC 60269-3 Low-voltage fuses - Part 3: Supplementary requirements for fuses for use by unskilled persons (fuses mainly for household and similar applications) - Examples of standardized systems of fuses A to F

IEC 60287 (All Parts) Electric cables - Calculation of the current rating

IEC 60331 (All Parts) Tests for electric cables under fire conditions - Circuit integrity

IEC 60331-11 Tests for electric cables under fire conditions - Circuit integrity - Part 11: Apparatus - Fire alone at a flame temperature of at least 750 °C

IEC 60331-21 Tests for electric cables under fire conditions - Circuit integrity - Part 21: Procedures and requirements - Cables of rated voltage up to and including 0.6/1.0 kV

IEC 60332 (All Parts) Tests on electric and optical fiber cables under fire conditions

IEC 60332-1-1 Tests on electric and optical fibre cables under fire conditions - Part 1-1: Test for vertical flame propagation for a single insulated wire or cable - Apparatus

IEC 60332-1-2 Tests on electric and optical fibre cables under fire conditions - Part 1-2: Test for vertical flame propagation for a single insulated wire or cable - Procedure for 1 kW pre-mixed flame

IEC 60364 (All parts) Low-voltage electric installations

IEC 60445 Basic and safety principles for man-machine interface, marking and identification - Identification of equipment terminals and of terminations of certain designated conductors, including general rules for an alphanumeric system

IEC 60446 Basic and safety principles for man-machine interface, marking and identification - Identification of conductors by colours or numerals

IEC 60447 : 1993 Man-machine interface (MMI) - Actuating principles

IEC 60449 Voltage bands for electrical installations of buildings

IS/IEC 60479-1 : 2005 Effects of current on human beings and livestock - Part 1: General aspects

IEC 60502 (All Parts) Power cables with extruded insulation and their accessories for rated voltages from 1 kV (Um = 1.2 kV) up to 30 kV (Um = 36 kV)

IS/IEC 60529 Degrees of protection provided by enclosures (IP Code)

IEC 60570 Electrical supply track systems for luminaires

IEC 60598-2-13 : 2006 Luminaires - Part 2-13: Particular requirements - Ground recessed luminaires

IEC 60598-2-22 : 1997 Luminaires - Part 2-22: Particular requirements - Luminaires for emergency lighting

IEC 60598-2-24 Luminaires - Part 2-24: Particular requirements - Luminaires with limited surface temperatures

IEC 60670-21 Boxes and enclosures for electrical accessories for household and similar fixed electrical installations - Part 21: Particular requirements for boxes and enclosures with provision for suspension means

IEC 60702 (All Parts) Mineral insulated cables and their terminations with a rated voltage not exceeding 750 V

IEC 60724 Short-circuit temperature limits of electric cables with rated voltages of 1 kV (Um = 1.2 kV) and 3 kV (Um = 3.6 kV)

IS/IEC 60898 Electrical accessories - Circuit- (All Parts) breakers for overcurrent protection for household and similar installations

IS/IEC 60947-2 Low-voltage switchgear and controlgear - Part 2: Circuitbreakers

IS/IEC 60947-3 Low-voltage switchgear and controlgear - Part 3: Switches, disconnectors, switchdisconnectors and fusecombination units

IEC 60947-6-2 Low-voltage switchgear and controlgear - Part 6-2: Multiple function equipment - Control and protective switching devices (or equipment) (CPS)

IEC 60947-7 Low-voltage switchgear and (All Parts) controlgear - Part 7: Ancillary equipment

IEC 60949 Calculation of thermally permissible short-circuit currents, taking into account non-adiabatic heating effects

IEC 60998 (All Parts) Connecting devices for lowvoltage circuits for household and similar purposes - Part 1: General requirements

IEC 61000-2 Electromagnetic compatibility (All Parts) (EMC) - Part 2: Environment

IEC 61009 (All Parts) Residual current operated circuit-breakers with integral overcurrent protection for household and similar uses (RCBOs)

IEC 61024-1 : 1990 Protection of structures against lightning - Part 1: General principles

IEC 61082 (All Parts) Preparation of documents used in electrotechnology

IEC 61140 Protection against electric shock - Common aspects for installation and equipment

IEC 61312-1 : 1995 Protection against lightning electromagnetic impulse - Part 1: General principles

IEC/TS 61312-2 : 1999 Protection against lightning electromagnetic impulse (LEMP) - Part 2: Shielding of structures, bonding inside structures and earthing

IEC/TS 61312-3 : 2000 Protection against lightning electromagnetic impulse - Part 3: Requirements of surge protective devices (SPDs)

IEC 61346-1 : 1996 Industrial systems, installations and equipment and industrial products - Structuring principles and reference designations - Part 1: Basic rules

IEC 61439-1 Low-voltage switchgear and controlgear assemblies - Part 1: General rules

IEC 61439-2 Low-voltage switchgear and controlgear assemblies - Part 2: Power switchgear and controlgear assemblies

IEC 61534 (All Parts) Power track systems

IEC 61535 Installation couplers intended for permanent connection in fixed installations

IEC 61537 Cable management - Cable tray systems and cable ladder systems

IS/IEC 61557-1 : 2007 Electrical safety in low voltage distribution systems up to 1 000 V a.c. and 1 500 V d.c. - Equipment for testing, measuring or monitoring of protective measures: Part 1 General requirements

IS/IEC 61557-2 : 2007 Electrical safety in low voltage distribution systems up to 1 000 V a.c. and 1 500 v d.c. - Equipment for testing, measuring or monitoring of protective measures: Part 2 Insulation resistance

IEC 61577-6 Electrical safety in low voltage distribution systems up to 1 000 V a.c. and 1 500 V d.c. - Equipment for testing, measuring or monitoring of protective measures - Part 6: Residual current devices (RCD) in TT and TN systems

IEC 61558-2-1 Safety of power transformers, power supplies, reactors and similar products - Part 2-1: Particular requirements for tests for separating transformers and power supplies incorporating separating transformers for general applications

IEC 61558-2-4 Safety of power transformers, power supply units and similar Part 2-4: Particular requirements for isolating transformers for general use

IS/IEC 61558-2-6 : 1997 Safety of power transformers, power supply units and similar - Part 2-6: Particular requirements for safety isolating transformers for general use

IEC 61558-2-15 Safety of power transformers, power supply units and similar - Part 2-15: Particular requirements for isolating transformers for the supply of medical locations

IEC 61643 (All Parts) Low-voltage surge protective devices

IEC 61643-1 : 1998 Surge-protective device connected to low-voltage power distribution systems - Part 1: Performance requirements and testing methods

IEC 61936-1 Power installations exceeding 1 kV a.c. - Part 1: Common rules

IEC 61995 (All Parts)Devices for the connection of luminaires for household and similar purposes

IEC Guide 104 The preparation of safety publications and the use of basicsafety publications and group safety publications

IS/IEC 62305-1 : 2010 Protection against lightning - Part 1: General principles

IS/IEC 62305-3 : 2010 Protection against lightning - Part 3: Physical damage to structures and life hazard

IS/IEC 62305-4 : 2010 Protection against lightning - Part 4: Electrical and electronic systems within structures

IS/ISO 834 Fire-resistance tests - Elements of building construction

IS/ISO 8528-12 : 1997 Reciprocating internal combustion engine driven alternating current generating sets - Part 12: Emergency power supply to safety services

ISO 30061 : 2007 Emergency lighting