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Dust explosionproof switchgear assemblies
with terminal boxes in the type of protection
'Protection by enclosure tb/tc'
The program comprising different enclosures is
designed for use in dust explosion-hazardous
areas of Zones 21 and 22 according to IEC
60079-0 and IEC 60079-31. The enclosures are
made of steel, stainless steel, aluminium or
polyester. Adapted to the installation require-
ments, the power distributions can be installed
in customer-specific wall as well as standing
structures.
Normal commercial industrial switchgear which
under operating conditions generate electric arcs
and sparks can be built into dust explosionproof
enclosures. These can be equipped with com-
mand status devices, shafts for operating circuit-
breakers and viewing windows. However, all
built-in devices in the enclosure walls (enclosure
housing) must correspond to a standardized type
of protection – at least of the category 2D/3D
according to Guideline 2014/34/EU. The inlet
flanges are equipped with cable and conductor
entry fittings – within the framework of the certi-
fied maximum number – according to the user's
requirements.
Via busbar systems the different electric circuits
can be rapidly and economically switched
together. For this purpose, special busbar sys-
tems are available which can be configured in
the modular system.
The equipping of dust explosionproof switchgear
assemblies with electric switchgears and com-
ponents is restricted so that, despite the interior
power loss, the surface temperatures corre-
sponding to the temperature class in each case
suffice for the standards to be used. By means
of a routine test, compliance with the tempera-
ture limits (the hottest place on the exterior of the
enclosure) is ensured, corresponding to the
maximum permissible surface temperature given
by the manufacturer.
ZONE 21
含接线端子盒的粉尘防爆开关柜组件的保护型
式
外壳保护为"tb/tc"
包含不同外壳的编排根据IEC60079-0和
IEC60079-31被设计用于粉尘爆炸危险场所21区
和22区。外壳由钢、不锈钢、铝或聚酯制成。
适应安装要求，此外，配电装置可以按照客户指
定的墙壁或直立结构进行安装。
普通商用工业开关柜在工作条件下产生电弧和火
花，它可以内置在粉尘防爆外壳中。可以安装指
令状态装置，空气开关操作轴和观察窗。然而，
所有外壳壁（外壳腔体）中的内置设备必须符合
标准的保护类型- 根据指南2014/34/EU至少属
2D/3D种类。入口法兰配有电缆和导线入口配件
-在认证框架内最大数量-根据用户的要求。
通过母线系统连接不同的电路可快速经济地一起
切换。为此，特殊母线系统可用在配置模块化系
统中。
粉尘防爆开关设备配备的电气开关设备和部件受
到限制，因此功率损耗，对应于每种情况下的温
度等级的表面温度要满足使用的标准。常规测试
目的，确保符合温度限制（设备外部最热的地方
），对应由制造商提供给定的最大允许表面温度
。
ZONE 22
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