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NEC / CEC REFERENCE FOR EXPLOSIVE ATMOSPHERES AND HAZARDOUS LOCATIONS


NEC / CEC PRODUCT MARKINGS

NEC / CEC METHOD OF EXPLOSION PROTECTION

NEC / CEC HAZARDOUS AREA CLASSIFICATION

NEC / CEC EXPLOSION GROUPS

NEC / CEC FULL REFERENCES

ATEX / IEC REFERENCE FOR EXPLOSIVE ATMOSPHERES AND HAZARDOUS LOCATIONS

ATEX / IEC PRODUCT MARKINGS

ATEX / IEC METHOD OF EXPLOSION PROTECTION

ATEX / IEC HAZARDOUS ZONE CLASSIFICATION

ATEX / IEC EXPLOSION GROUPS

ATEX / IEC NAMEPLATE MARKING

ATEX / IEC INGRESS PROTECTION (IP)

ATEX / IEC EXPLOSION ZONES

ATEX / IEC TEMPERATURE CLASSIFICATION

ATEX / IEC FULL REFERENCES

IP Rating

Degree of protection of the enclosures for electrical equipment in accordance with the IEC 529 and EN 60529 standards.

Ingress Protection (IP) or IP Rating consist of 2 numbers, that is IP ??.

The first number mean protect against solid bodies

0 - No protection
1 - Protected against solid bodies larger than 50mm (hand)
2 - Protected against solid bodies larger than 12.5mm (finger)
3 - Protected against solid bodies larger than 2.5mm (tools, wires)
4 - Protected against solid bodies larger than 1mm (fine tools, small wires)
5 - Protected against dust (no harmful deposit)
6 - Completely protected against dust.

Second number mean protect against liquids

0 - No protection
1 - Protected against vertically-falling drops of water
2 - Protected against drops of water falling at up to 15 degree from the vertical.
3 - Protected against drops of water falling at up to 60 degree from the vertical.
4 - Protected against drops of water from all directions.
5 - Protected against jets of water from all directions.
6 - Completely protected against jets of water of similar force to heavy seas.
7 - Protected against the effect of immersion.
8 - Protected against effect of prolonged immersion under specific conditions

Weather Proof    - IP54
Water Tight    - IP65
Dust Tight             - IP66
Immersion Proof - IP67
Explosion Proof    - Exd
Dust Ignition Proof - D.I.P.

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Explosion Proof

Design and Installation of Electrical Systems for Hazardous Areas.

The design and selection of electrical apparatus for hazardous areas applications should be in accordance with the following :-

Classification of the hazardous area
Temperature class or ignition temperature of the gas, liquid, vapour, mist, dust or fibre.
Where applicable, the gas, vapour or dust classification in relation to the group or sub-group of the electrical apparatus.
External influences and ambient temperature.

Apparatus Selection for Zone 0

Intrinsic Safety 'ia'

Apparatus Selection for Zone 1

Electrical apparatus permitted for use in Zone 0, or
Flameproof enclosure 'd'
Pressurised apparatus 'p'
Powder filling 'q'
Oil immersion 'o'
Increased safety 'e'
Intrinsic safety 'ib'
Encapsulation 'm'

Apparatus Selection for Zone 2

Electrical apparatus permitted for use in Zone 0 and Zone 1, or
Electrical apparatus designed specifically for Zone 2 (e.g. type of protection 'n') or
Electrical apparatus complying with the requirements of a recognised standard for industrial electrical apparatus, which does not, in normal operation, have ignition capable hot surface and does not in normal operation produce arcs or sparks. This equipment must be in an enclosure with a degree of protection and mechanical strength suitable for the environment and be assessed by a person who is familiar with the requirement of any relevant standards and codes of practice.

Apparatus Selection for Zone 20, 21 and 22

IEC/EN 61241-0 - Electrical apparatus for use in the presence of combustible dust. General requirements. and
IEC/EN 61241-1 - Electrical apparatus for use in the presence of combustible dust. Protection by enclosure 'tD'.

Type of Protection

Exd - Flameproof (motor, lighting, junction boxes) - Equipment is robust can stand an explosion from within, without transmitting the flame to the outside. Equipment has flameproof gaps (max 0.006" propane/ethylene, 0.004" acetylene/hydrogen)/
Exe - Increased Safety (motor, lighting, junction boxes) - Equipment is very robust and components are made to a high quality
Exo - Oil Immersion (transformer) - Equipment components are completely covered with a layer of oil
Exq - Powder Filled (capacitors, electronics) - Equipment components are completely covered with a layer of Sand, powder or quartz
Exm - Encapsulation (electronics-no heat) - Equipment components of the equipment are usually encased in a resin type material
Exp - Pressurised Enclosure / Rooms (power apparatus) - Equipment is pressurised with a positive pressure; gas cannot get in for air coming out or equipment is purged with a diluting gas such as air. If air is used, it is ducted in from outside the hazardous area.
Exi - Intrinsic Safety (instrumentation, control, measurement) - Any arcs or sparks in this equipment has insufficient energy (heat) to ignite a vapour. Equipment can be installed in ANY housing provided to IP54. A 'Zener Barrier' or 'opto isol' or 'galvanic' unit may be used to assist with certification.
Exn - Non Sparking (motor, lighting, junction boxes, electronics) - Equipment is non-incendive or non-sparking.
Exv - Ventilation -
Exs - Special Protection - This method, being by definition special, has no specific rules. In effect it is any method which can be shown to have the required degree of safety in use. Much early equipment having Ex s protection was designed with encapsulation and this has now been incorporated into IEC 60079-18 [Ex m]. Ex s is a coding referenced in IEC 60079-0. The use of EPL and ATEX Category directly is an alternative for “s” marking.

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References :

IEC/EN 60079-0 - General Requirements
IEC/EN 60079-1 - Flameproof Enclosure 'd'
IEC/EN 60079-2 - Pressurisation 'p'
IEC/EN 60079-5 - Powder Filling 'q'
IEC/EN 60079-6 - Oil Immersion 'o'
IEC/EN 60079-7 - Increased Safety 'e'
IEC/EN 60079-11 -Intrinsic Safety 'i'
IEC/EN 60079-15 -Electrical Apparatus type 'n'
IEC/EN 60079-18 -Encapsulation 'm'
IEC/EN 61241-1 -Dust protection by enclosure

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NEC / CEC REFERENCE FOR EXPLOSIVE ATMOSPHERES AND HAZARDOUS LOCATIONS

ATEX / IEC REFERENCE FOR EXPLOSIVE ATMOSPHERES AND HAZARDOUS LOCATIONS

IP Rating

Explosion Proof