Customer Support: +44 (0)203 327 3140

Login to i2i Subscription Intertek.com
  • There are no items in your cart
We noticed you’re not on the correct regional site. Switch to our AMERICAS site for the best experience.
Go to AMERICAS site
Dismiss alert
Please enter a keyword to search
Advanced search

BS 6704:1996

Current
Current

The latest, up-to-date edition.

Code of practice for selection, installation and maintenance of intrinsically safe electrical equipment in coal mines
Available format(s)

Hardcopy , PDF

Language(s)

English

Published date

15-11-1996

Publisher

British Standards Institution

Committees responsible
Foreword
Code of Practice
Section 1. General
1.1 Scope
1.2 References
1.3 Definitions
1.4 Information on legislation
1.5 Information on certification
1.6 Information on certification of electrical
      apparatus and systems
1.7 Marking of apparatus certified to BS 5501 Part 7
Section 2. Selection and installation of electrical
apparatus and systems
2.1 Selection
2.2 Installation
Section 3. Inspection and testing
3.1 General
3.2 Inspection
3.3 Routine inspection
3.4 Insulation and earth continuity testing
3.5 Records
Section 4. Maintenance and repair
4.1 General
4.2 Maintenance work in a hazardous area
4.3 Maintenance work in a non-hazardous area
4.4 Cable disconnection
4.5 Batteries
4.6 Electrical measuring instruments
4.7 Repair and overhaul
Annexes
A (normative) Competence of personnel
B (informative) Characteristics of mining type cables
Tables
1 Standards dealing with the design, construction and
      testing of electrical apparatus for use in
      hazardous atmospheres
B.1 Telephone cable inductance and resistance ratios
      (nominal values)
B.2 Signalling cable inductance and resistance ratios
      (nominal values)
B.3 Electrical characteristics of pliable wire
      armoured cables to BS 6708:1991 (nominal values)
B.4 Electrical characteristics of two-core steel wire
      armoured cables to BS 6708:1991 (nominal values)
Figures
1 Certification mark
2 Example of marking of apparatus for connection
      to other apparatus and which does not incorporate
      a power source
3 Example of marking of a mains driven power supply
      unit contained within a flameproof enclosure
List of references

Includes inspection, testing, maintenance and repair, and competence of personnel in respect of safe practice.

This British Standard describes the concept of ensuring electrical safety in hazardous atmospheres in coal mines by means of the type of protection ‘i’ (intrinsic safety), provides background information and gives recommendations on the selection, installation, inspection and testing, and maintenance and repair of intrinsically safe electrical apparatus, systems and networks.

Electrical safety of apparatus installed outside the hazardous atmosphere, or which is safeguarded by a type of protection other than intrinsic safety, is also considered in so far as the selection, installation and maintenance of such apparatus could affect intrinsically safe circuits. Only explosion risks due to the presence of flammable gases and vapours are considered. Combustible dusts are excluded except for coal dust layers which could be ignited by elevated surface temperatures.

Design or performance aspects of intrinsically safe apparatus pertinent to operational safety are not considered.

Committee
W/-
DevelopmentNote
Supersedes 94/705033 DC and BS 6704(1987) (09/2005) Reviewed and confirmed by BSI, January 2011. (12/2010)
DocumentType
Standard
Pages
24
PublisherName
British Standards Institution
Status
Current
Supersedes

BS 7924:1999 Code of practice for the repair and overhaul of certified electrical apparatus intended for use in mines susceptible to firedamp
BS 6705:1987 Specification for electrical measuring instruments for use on intrinsically safe circuits in coal mines

BS 6709:1986 Specification for interconnection of electrical apparatus, constructed to two or more British Standards, for use in mines susceptible to firedamp
BS 6556-1:1985 Low speed digital signals for use in coal mines. Specification for optical coupling
BS EN 50014:1998 Electrical apparatus for potentially explosive atmospheres. General requirements
BS 6182-2:1982 Intrinsically safe power supplies for use in coal mines Specification for a.c. power supplies
BS 6708:1991 Specification for flexible cables for use at mines and quarries
BS 6346:1989 Specification for PVC-insulated cables for electricity supply
BS 6353:1983 Specification for underground loudspeaker communication systems in coal mines
BS 5501-9:1982 Electrical apparatus for potentially explosive atmospheres Specification for intrinsically safe electrical systems \'i\'
BS 5501-4:1977 Electrical apparatus for potentially explosive atmospheres Powder filling \'q\'
BS 5501-7:1977 Electrical apparatus for potentially explosive atmospheres Intrinsic safety \'i\'
BS 6556-2:1985 Low speed digital signals for use in coal mines Specification for transformer coupling
BS 6182-1:1994 Intriniscally safe power supplies for use in coal mines Specification for d.c. power supplies
BS 7202:1989 Specification for non-incendive low voltage control/interlock and low voltage earth fault monitoring circuits for use in mines
BS EN 50017:1998 Electrical apparatus for potentially explosive atmospheres. Powder filling \'q\'
BS 5501-6:1977 Electrical apparatus for potentially explosive atmospheres Increased safety \'e\'
BS 5501-1:1977 Electrical apparatus for potentially explosive atmospheres General requirements
BS 5501-5:1977 Electrical apparatus for potentially explosive atmospheres Flameproof enclosure \'d\'
BS EN 50033:1991 Specification for construction and testing of miners\' caplamps in relation to the risk of explosion, for mines susceptible to firedamp
BS 5501-8:1988 Electrical apparatus for potentially explosive atmospheres Encapsulation \'m\'
BS EN 50015:1998 Electrical apparatus for potentially explosive atmospheres. Oil immersion \'o\'
BS 5501-2:1977 Electrical apparatus for potentially explosive atmospheres Oil immersion \'o\'
BS 6182-3:1982 Intrinsically safe power supplies for use in coal mines Specification for rechargeable battery units
BS 5754:1987 Specification for electrical analogue and state signals for use in coal mines
BS 6556-3:1985 Low speed digital signals for use in coal mines Specification for message protocols
BS 5501-3:1977 Electrical apparatus for potentially explosive atmospheres Pressurized apparatus \'p\'
BS EN 50020:2002 Electrical apparatus for potentially explosive atmospheres. Intrinsic safety \'i\'
BS EN 60086-1:2016 Primary batteries General
1994/9/EC : 1994 DIRECTIVE 94/9/EC OF THE EUROPEAN PARLIAMENT AND THE COUNCIL OF 23 MARCH 1994 ON THE APPROXIMATION OF THE LAWS OF THE MEMBER STATES CONCERNING EQUIPMENT AND PROTECTIVE SYSTEMS INTENDED FOR USE IN POTENTIALLY EXPLOSIVE ATMOSPHERES
BS 6705:1987 Specification for electrical measuring instruments for use on intrinsically safe circuits in coal mines
BS EN 50018:2000 Electrical apparatus for potentially explosive atmospheres. Flameproof enclosure \'d\'

View more information
£208.00
Excluding VAT
GBP
CAD
CHF
CNY
DKK
EUR
GBP
HKD
IDR
INR
JPY
KRW
MXN
NOK
NZD
SEK
SGD
USD
ZAR
Hardcopy - English
PDF - English
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50

Access your standards online with a subscription

Features

  • Simple online access to standards, technical information and regulations.

  • Critical updates of standards and customisable alerts and notifications.

  • Multi-user online standards collection: secure, flexible and cost effective.

Learn more on subscription solutions

or

Get in touch with us