Shenzhen Zhongnuo Inspection & Technology Co., Ltd. is based in South China and specializes in explosion-proof certification and coal safety certification application consulting services, offering one-stop explosion-proof technology consulting services.
How to inquire about explosion-proof certification
Buyers and selectors of explosion-proof electrical equipment will always opt for manufacturers or distributors with an explosion-proof certification.
So, as a consumer, how can users verify the authenticity and validity of the explosion-proof certification?
Currently, there are a dozen or so authorized issuing organizations for domestic explosion-proof certification.
There is no unified search platform for explosion-proof certification issued by various certification authorities.
Explosion-proof certificates issued by various institutions can only be accessed on their respective websites.
Of course, every issuing organization can verify the authenticity of certificates by phone.
If the query certificate is genuine, the main parameters and validity period will be displayed below.
Of course, it wouldn't be found then.
It's worth noting that due to the manual uploading of certification documents by various issuing authorities, there is a certain lag.
That is to say, the newly acquired certificate may not yet be searchable on their website, which requires direct consultation with the issuing organization.

North American Intrinsically Safe Certification
North American Electrical Code Certification System (hereinafter referred to as NEC System [NEC: National Electrical Code]).
Classification and grouping of explosive materials, hazardous area delineation, explosion-proof protection methods.
There is a significant difference between the installation and wiring standards and the explosion-proof certification system supported under our national standard system (hereinafter referred to as the GB system).
Currently, explosion-proof certifications in North America are divided into two major systems: Division and Zone. The Division system uses the native American explosion-proof mark.
The Zone system adopts the same explosion-proof standard as the IEC system.

Division of Explosion-Proof Areas in Combustible Dust Environments -- Shenzhen ZhongNuo Testing Technology Co., Ltd.
In explosion-proof certification, hazardous areas are divided into explosive gas environments and combustible dust environments based on the different states of substances present at the location. According to the duration of the presence of hazardous substances in the location, these two types of hazardous areas with different states are further divided into three zones.
For environments with combustible dust, it applies to 20, 21, and 22 zones.
Areas in Zone 20 where flammable dust environments occur continuously or exist for extended periods, typically above 1000 hours per year.
Zone 21 – Areas where combustible dust environments may occur during normal operation, typically 10-1000h/year
Zone 22 is designed to prevent flammable dust environments during normal operation, and such environments, if they occur, are usually sporadic and of short duration, less than 10 hours per year.

How to Apply for an Explosion-Proof Certification for a Company:
1. Self-Application: The company applies to the certification body independently, prepares relevant documents on its own, assists in debugging the prototype, and modifies the parts of the documents that are not in accordance with the regulations. The process is relatively longer, with higher overall costs, and requires more time and effort.
2. Agent Application: It refers to the entire process of consulting and applying to Shenzhen ZhongNuo Testing Technology Co., Ltd., including material revisions, prototype debugging, and progress coordination, all handled by the consulting agency, ensuring a good progress guarantee. Fast certificate acquisition, controllable overall cost, saves time and effort.
Explosion-proof Certification Application Consulting Services - Shenzhen ZhongNuo Testing Technology Co., Ltd.