What are the requirements for zone 1 or zone 2 electrical cabinets?
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Hello everyone, as the title says, explosive gas may exist in Zone 1, and exists temporarily in Zone 2. The common requirement is to reach Zone 1. I would like to ask what kind of electrical control cabinet is more suitable for Zone 1? I have seen some use explosion-proof cabinets. The steel plates are 10 millimeters thick. The buttons and lights are all explosion-proof, which is expensive and difficult to operate. Some manufacturers' equipment, such as motor control panels, do not have such protection. What kind of cabinet is more suitable? Can it be positive-pressure explosion-proof? Or an ordinary double-layer cabinet. There is another question. If a positive pressure explosion-proof cabinet is used on the air compressor skid, how to solve the air source problem? To ensure ventilation first, you must manually operate the compressor to inflate the explosion-proof cabinet. After the air supply is guaranteed, you have to switch to automatic. It is very troublesome. I hope relevant experts can give guidance. According to my understanding, air compressors are generally used in safe areas (although it is marked as required to meet Zone 1 group IIA/B T3), and there is no need for positive pressure explosion-proof or bulky explosion-proof operation cabinets. What do you think about this? What kind of control cabinet should be selected in strict accordance with the regulations? This post was last edited by laoyier on 2009-3-9 13:06 ]
Explosion-proof electrical cabinets are very expensive. You can place the electrical cabinet outside the explosion-proof area, but there are a lot of cables. Inspection and maintenance of explosion-proof electrical cabinets in explosion-proof areas during the production process is also a troublesome matter. It is recommended that the electrical cabinet be placed outside the explosion-proof area. The positive pressure electrical cabinet must have a stable source of nitrogen, usually a gas cylinder will suffice.
Haha, what you said above is good, but I probably didn’t think about it properly during the design.
It’s not that I haven’t thought about it. It is a skid equipment, so the control panel must be on the local skid. The equipment requirements must meet the requirements of Zone 1. The positive pressure explosion-proof must ensure an uninterrupted air source. If a gas cylinder is used, the design is not very reasonable. My question is whether the control cabinet must be explosion-proof according to the explosion-proof requirements of Zone 1? Still not necessary. Sometimes the air compressor gas source is natural gas used in mines, so it does not mean that the compressor and other equipment must be explosion-proof. If the control cabinet uses a positive pressure cabinet, an additional inert gas source must be introduced to ensure working requirements. The other is that the air compressor is in a safe zone, so there is no use for it. Now that the equipment is in Zone 1, the control part of the air compressor is not explosion-proof, so what is the use of using explosion-proof in the local control cabinet. This post was last edited by cqfblue on 2009-3-10 10:32 ]
Electrical explosion-proof cabinets should be used, after all, safety comes first
I guess some tie made the decision? Tell the truth. This is not easy to handle. Weigh it yourself. I suggest you respond privately to the relevant leader and wipe his ass. Directly replace it with an explosion-proof cabinet. Of course, it is also allowed to replace it with a positive pressure explosion-proof cabinet. Otherwise you won't be able to shoulder that responsibility. Complete sets of equipment do have such problems. You still don't want to bother with the matching cabinets, as I understand it. It’s hard to pressurize even if you want;P When ordering, you should tell the equipment manufacturer about the explosion-proof requirements. The two parties then negotiated to entrust a third-party explosion-proof company to help build the control cabinet. The equipment manufacturer is responsible for the drawings and technical guidance:P
Thank you upstairs, but sometimes I just mess around to save money. At least I understand that the most suitable thing for us is to use explosion-proof cabinets. The person who did the design at that time cheated the boss and made it like this. In the future, I will strictly follow the specifications to customize the control cabinets. After all, safety is important. If you can use positive pressure explosion-proof cabinets, use positive pressure explosion-proof cabinets. If there are no conditions, you can only use explosion-proof cabinets.
The electrical control cabinet should be an "instrument control cabinet". What does the electrical control cabinet refer to? Because distribution rooms, etc. should be outside explosion-proof areas, except for special circumstances.
I have encountered the situation mentioned by the poster several times. Compressors, air compressors, etc. are relatively large in size, and may include several oil pumps and motors. And there are more interlocks when driving. So it is indeed an electric control cabinet, and the power distribution of some small motors is also in it;P
It may also include PLC and other electrical control cabinets. Thanks for the reply upstairs.
Haha, I haven't encountered it before, putting electrical cabinets in dangerous areas. It's dangerous just thinking about it.