Shenzhen ZhongNuo Testing 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.
Sample requirements for explosion-proof certification application:
The sample machines submitted by the company for inspection must match the approved drawings and be fully assembled. The number of units inspected should meet the requirements.
If special disassembly tools are required, they should be sent along as well.
For potting-type electrical equipment, a set of both potted and unpotted products should be submitted.
The transparent parts for the observation window should be sent separately with at least 3 pieces, an additional 5 pieces.
The transparent parts of the lighting fixtures should be sent separately in an additional 8 pieces, with at least 5 pieces.
Rubber aging tests should provide 3 to 5 pieces of 35156 rubber blocks.
Two 150-60mm diameter plastic sheets are required for the insulation resistance test of the plastic shell. If the dimensions permit, the test can be conducted directly on the plastic shell.
Finished products typically require 1-2 samples.

Difference between Intrinsically Safe and Explosion-Proof:
This is in two different explosion-proof protection types.
Explosion-proof typically involves using an explosion-proof housing for protection. The housing must have sufficient thickness and strength.
Even in the event of an explosion inside the equipment, the flame will be extinguished due to the width, gap, and roughness of the explosion-proof shell joint surfaces, preventing ignition of the external hazardous environment.
On the other hand, the explosion-proof housing boasts its anti-explosion properties even in hazardous areas outside.
Overall, the housing is both explosion-resistant and shockproof. The equipment will be rather heavy.
intrinsically safe, referring to equipment that achieves intrinsic safety by limiting circuit energy, etc.
Safety-certified products have higher requirements for equipment's circuitry and operating power, typically suitable for handheld devices and low-power products.

Intrinsically Safe Electrical Equipment Explosion Proof Classification | ZhongNuo Inspection
Intrinsically safe equipment has explosion-proof ratings of IA, IB, and IC, determined based on intrinsic circuit evaluation considering both counted and uncounted faults. IA rating is used in Zones 0, 1, and 2; IB rating is suitable for Zones 1 and 2; IC rating is only applicable in Zone 2.
Additionally, intrinsic safety equipment can be used in mining environments and non-mining explosive gas and dust environments, primarily by limiting the energy in the circuit, ensuring it cannot ignite the surrounding explosive atmosphere under normal operating conditions and fault conditions, thus inherently safe, hence referred to as intrinsic safety.
If you have more questions about the design and certification of intrinsically safe equipment, Shenzhen ZhongNuo Testing Technology Co., Ltd. can continue to provide you with answers.

Explaining the Alphabet Meaning of Explosion-Proof Certification Marks | ZhongNuo Inspection
The significance of the alphabetical ratings for explosion-proof classifications is crucial for understanding and selecting the appropriate explosion-proof equipment. Below is a detailed explanation by Shenzhen Zhongnuo Testing Technology Co., Ltd. on the meanings of the alphabetical ratings for explosion-proof classifications:
Basic Components of Explosion-Proof Marking
The explosion-proof marking is typically composed of several letters and numbers, mainly including the following parts:
"Explosion-Proof Mark: 'Ex' marking indicates that the equipment has passed explosion-proof certification and meets explosion-proof standards."
Explosion-proof Type: Usually a letter indicating the type of explosion-proof protection adopted by the equipment.
Gas Groups: Specify the gas group that the equipment is suitable for, such as I, IIA, IIB, IIC, etc., representing different explosive gas environments.
Temperature Group: Represented by the letter "T" followed by a number, where the number indicates the high surface temperature of the equipment during operation. Commonly used are T1 to T6.
Equipment Protection Level: Indicates the Equipment Protection Level (EPL), commonly used to further delineate the safety performance of equipment in explosive environments.
Explosion-proof Certification Application Consultation Services - Shenzhen ZhongNuo Inspection & Technology Co., Ltd.