Shenzhen Zhongnuo Testing Technology Co., Ltd. is based in South China, specializing in explosion-proof certification and coal mine safety certification application consulting services, offering one-stop explosion-proof technology consulting services.
What is the difference between Corrosion Resistance Level, Protection Level, and Explosion-proof Certification Level?
Many corporate clients are often confused about the required corrosion resistance, protection, and explosion-proof certification levels for their products.
Due to the fact that there's only a one-character difference in the names, and they both refer to a certain grade of the product, they are similar yet distinct. So, what are the differences between them?
Corrosion prevention involves taking measures to protect metals prone to rust, with the aim of extending their service life. Typically, methods such as physical, chemical, and electrochemical corrosion prevention are employed. There are five common levels: indoor F1, F2, and outdoor WF, WF1, and WF2.
Protection rating, commonly known as IP rating, refers to the dust and water resistance level of the equipment, usually consisting of "IP" followed by two digits.
The explosion-proof grade generally refers to the equipment's explosion-proof certification level. Each electrical device applying for an explosion-proof certification will have a corresponding explosion-proof marking, including the type and grade of explosion-proof. The explosion-proof grade indicates the product's applicable explosion-proof area, gas/dust group, temperature group, and equipment protection level, etc.
Evidently, these are different concepts from various fields. For more information on this topic, feel free to message us anytime!

Certificate of explosion-proof validity and renewal issue
The validity period of the domestic explosion-proof certification is 5 years from the date of issuance.
If the certificate is due to expire, you may choose to renew it or replace it. When the expiration of the company's explosion-proof qualification certificate is approaching,
The company shall provide an application letter for certificate renewal within three months before and after the validity period, and should also bring relevant documents for the renewal application.
Overseas explosion-proof certification, such as ATEX and IECEx certificates, is valid for a specific period.
Due to their method of evidence collection being a type test approach.
A combination of product certification and factory production quality system audit.
Ensure the validity of the certificate.

North American Explosion Proof Certification
North American Electrical Code Certification System (hereinafter referred to as NEC [National Electrical Code]) system
Classification and grouping of explosive materials, hazardous area delineation, explosion-proof protection methods.
There is a significant difference in wiring installation aspects between what is supported by our national standard system's explosion-proof certification system (hereinafter referred to as the GB system).
Currently, North American explosion-proof certification is divided into two major systems: Division and Zone. The Division system uses the explosion-proof marking native to the United States.
The Zone system employs explosion-proof standards consistent with the IEC system.

How to Apply for an Explosion-Proof Certification for a Company:
1. Self-Application: The company applies to the certification body independently, prepares the relevant documents on its own, assists in the debugging of the sample machine independently, and modifies the parts of the documents that are not in accordance with the regulations independently. The process is relatively longer, with higher comprehensive costs, and it takes both time and effort.
2. Agent Application: Refers to the entire process of consulting and applying to Shenzhen ZhongNuo Testing Technology Co., Ltd., including material modifications, prototype debugging, and progress coordination, which are entrusted to the consulting agency. Progress is well-ensured. Fast certification, manageable overall costs, time and labor-saving.
Explosion-proof Certification Application Consulting Service - Shenzhen Zhongnuo Testing Technology Co., Ltd.