Zones; Degree Of Ignition Protection, Groups And Temperature Classes - Bosch Rexroth MKE Series Project Planning Manual

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Operating Conditions and Application Notes

Zones

Zone 0
Zone 1
Zone 2

Degree of ignition protection, groups and temperature classes

Ignition protection classes
Groups
Rexroth MKE Synchronous Motors | Project Planning Manual
and Controls
Potentially explosive areas are classified into the following zones according to
the probability with which an explosive atmosphere develops in them.
The following information is based on EN 60079-14:1997and the
BGBI. 1996 Part 1. If you would like to receive detailed information,
please consult these documents.
Zone 0 includes areas in which an explosive atmosphere, which contains a
mixture of air and gas, dust and mist, exists continuously, for a long-term or
frequently.
Electrical equipments must only be used in zone 0, if they comply with the
specifications according to EN 50020: 1994 (intrinsic safety "1").
Zone 1 contains areas in which an explosive atmosphere of gas, dust or mist
can exist occasionally.
Electrical equipments must only be used in zone 1, if they are constructed for
zone 0 or for one of the degrees of protection .
Zone 2 contains areas in which an explosive atmosphere of gas, dust or mist
is unlikely to occur. But if it occurs then in all likelihood rarely and for a short
period of time.
Electrical equipment is permissible for use in zone 2 if it:
● is designed according to the requirements for zone 0 or 1;
● is specifically designed for zone 2.
● corresponds to the requirements of a recognized standard for industrial
electrical equipment and has no ignitable hot surfaces when in undistur‐
bed operation.
The electrical equipments for potentially explosive areas are subdivided into:
The electrical equipment is designed according to the type of protection. The
requirements are stipulated in special standards.
Ignition protection class
Oil immersion
Pressurizing
Powder filling
Pressure-resistant casing
Increased safety
Intrinsic safety category a
Intrinsic safety category b
Encapsulation
Fig.9-2: Degree of protection
Electrical equipment of these degrees of protection are certified by way of a
prototype test by a neutral body.
● Group I: Electrical equipment for mines susceptible to fire damp.
● Group II: Electrical equipment for all potentially explosive areas, other than
mines susceptible to fire damp.
Description Standard
o EN50015: 1998
o EN50016.1995
q EN50017: 1998
‑{}‑‑{}‑d EN50018: 1994
e EN50019: 1994
ia EN50020: 1994
ib EN50020: 1994
m EN 50028: 1987