Maximum operating temperature
The highest value of the operating temperature.
NOTE: Every equipment may reach different operating temperatures in differ‐
ent parts.
Maximum surface temperature
The highest temperature which is reached under the most adverse conditions
(but within the recognized tolerances) by any part or surface of an electrical
equipment in service, which would be able to produce an ignition of the sur‐
rounding explosive atmosphere.
Ignition protection class
The specific measures taken for electrical equipment to avoid ignition of a sur‐
rounding explosive atmosphere.
Degree of protection of the housing
(IP)
A numerical classification preceded by the symbol "IP" applied to the housing
of electrical equipment to provide for:
●
the protection of persons against contact with or approach to live parts
and against contact with moving parts (other than plain rotating shafts and
the like) inside the housing,
●
the protection of the electrical equipment penetration of solid foreign bod‐
ies; and, where indicated by the classification,
●
the protection of the electrical equipment against harmful penetration of
water.
NOTE: The housing that provides the degree of protection IP is not necessarily
identical with the housing of the equipment for the ignition protection.
Rated value
A quantitative value assigned usually by the manufacturer for a specified op‐
erating condition of a component, a unit or an equipment.
Rated data
The set of rated values and operating conditions.
Cable entry
A device permitting the feeding-in of one or more electric and / or fibre-optic
cables into an electrical equipment so as to maintain the relevant type of ignition
protection.
Ex cable and line entry
A cable and line entry which is tested separately from the equipment housing,
but certified as an equipment, and which can be fitted to the equipment housing
during installation without further certification being required.
Entry for pipelines
A means permitting the entry of a pipeline into an electrical equipment.
Pressure part
An element of a cable entry acting on the sealing ring to enable the latter to fulfil
its function.
Strength member
An element of a cable entry for preventing tensile or torsional forces of the cable
from being transmitted to the connection parts.
Sealing ring
A ring used for the entry of a cable, conduit or pipeline in order to ensure the
impermeability between the entry and the cable, conduit or pipeline.
Connection compartment
A separate compartment or part of a main enclosure, communicating or not with
the main enclosure, and containing connection facilities.
Connection facilities
Clamps, screws or other parts, used for the electrical connection of conductors
of external circuits.
Feedthrough
An insulation device carrying one or more conductors through an internal or
external wall of a housing.
Ex component
A part of an electrical equipment for potentially explosive areas, or a module
(other than an Ex cable entry), marked with the symbol "U", which is not inten‐
ded to be used alone and requires additional certification, when incorporated
into electrical equipments or systems or use in potentially explosive atmos‐
pheres.
Project Planning Manual | Rexroth MKE Synchronous Motors
Electric Drives
and Controls
| Bosch Rexroth AG
75/131
Operating Conditions and Application Notes
