Eight types of explosion-proof electrical appliances

The types of explosion-proof electrical appliances are divided into two categories according to the specific use environment: one is for coal mine underground electrical equipment; the other is for factory electrical equipment. According to the characteristics of sparks, arcs, and dangerous temperatures generated by electrical equipment and measures taken to prevent them from igniting explosive mixtures, the following eight forms are available:
(1) Flameproof type (mark d); is an electrical device with a flameproof enclosure that can withstand the explosion pressure of the internal explosive gas mixture to prevent the internal explosion from propagating to the explosive mixture around the enclosure. Suitable for any place of explosion hazardous locations.
(2) Increased safety (mark e). Under normal operating conditions no arcs, sparks, or high temperatures sufficient to ignite the explosive mixture will occur. Various measures are taken structurally to increase safety to avoid arcs, sparks and high temperatures under normal and recognized overload conditions.
(3) Intrinsically Safe (Identifiers ia, ib): Use IEC76-3 spark test device. EDM and thermal effects resulting from normal operation or specified fault conditions do not ignite the specified explosive mixture. This kind of electrical equipment is classified into ia and ib according to the place of use and the degree of safety. The ia rating device does not ignite the explosive gas mixture during normal operation, one failure, and two failures. An ib rating device cannot ignite an explosive gas mixture during normal operation and failure.
(4) Positive pressure type (mark p): It has a positive pressure enclosure that can maintain the internal protective gas, that is, the pressure of fresh air or inert gas is higher than the pressure of the surrounding explosive environment, preventing the external mixture from entering the enclosure.
(5) Oil-filled type (mark U): It is an oil or a part of the electrical equipment immersed in the oil, so that the equipment can not be lit above the oil surface or outside the shell of the explosive mixture, such as high-pressure oil switch is such.
(6) Sand-filled type (mark q): The sand material is filled in the outer shell so that under the conditions of use, arcing, flame propagation, shell wall, or sand material surface overheating of the shell cannot ignite the surrounding explosive mixture.
(7) Non-sparking type (mark n): Under normal operating conditions, the surrounding explosion mixture will not ignite, and generally no ignition failure will occur.
(8) Special type (marker s): Refers to electrical equipment that does not belong to any of the above categories, but uses other special explosion-proof measures. Such as the filling of sand and sand type equipment is such.

Press-Locked Grating is specified due to its clean, smooth look as well as supporting the same loads as welded bar grating though not recommended for rolling loads.

Compared to press-welded grating

Press-Locked Grating possesses the same charateristics with none welding spots and better artistic looking.

Press-locked Steel Grating


Packing

Pallets in containers packed by steel strap and worthy sea shipping, or according to the customers'requirements


Applications



*Passage / Platform / Parking Spot / Fence
*Walkway / Catwalk / Floors
*Facade / Sunscreen Shield
*Building Ceiling



Press-locked Steel Grating

Press-Locked Steel Bar Grating,Galvanized Grating For Oil Pier,Pressure Lock Bar Grating

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