How Deep to Bury Liquid Tight Conduit
Learn the proper depth requirements for burying liquid-tight conduit to ensure safe and code-compliant electrical installations.

In complex industrial environments, Waterproof joint symbol are not just simple marks, but also a bridge connecting safety and efficiency. Imagine that in the sea breeze and salt spray of an oil platform, or in the humid environment of automated equipment, each symbol on a cable connector has a vital mission. These inconspicuous symbols are actually the “invisible guardians” of the safe operation of the system.
However, the choice of symbols is by no means a trivial matter. A wrong symbol may lead to serious consequences – water seepage, short circuit, and even irreversible safety accidents. These symbols are not just used to convey information, they are also a contract of quality and responsibility, and an important guarantee to ensure the reliability and safe operation of equipment. In an industrial environment, every symbol silently tells of the commitment to safety and quality.
Industrial and safety symbols play a vital role in technical applications. They not only convey information, but also directly affect equipment performance and safety.
IPXX (waterproof and dustproof grade)
Technical meaning: Identifies the protection level of the device, for example, IP68 means it is completely dustproof and can be used underwater for a long time at a certain depth. Ensures the sealing and durability of the device in extreme environments (such as deep sea or humid places).


ATEX/IECEx (explosion-proof certification mark)
Technical meaning: Indicates that the equipment meets safety standards in explosive environments. A safety pass for chemical plants or mining areas to reduce the risk of explosion.
-40°C▲ (extreme temperature tolerance mark)
Technical meaning: Indicates that the equipment can operate normally in extremely low temperature environments. For example, the Arctic oil pipeline remains flexible at -50°C, ensuring the stability of the equipment.
M25x1.5 (thread specification code)
Technical meaning: Identify the thread size to ensure installation matching. Avoid construction delays due to thread mismatch during on-site installation.
⚡ Red lightning mark (anti-electromagnetic interference certification)
Technical meaning: The device has the ability to resist electromagnetic interference. It ensures zero interference with medical equipment or high-precision instrument data and improves work efficiency.
IP67≠IP68
Although both IP67 and IP68 provide dust and water protection, their application scenarios are significantly different. IP67 is suitable for temporary immersion (up to 1 meter deep for 30 minutes), while IP68 supports deeper and longer underwater use (usually more than 1 meter, the specific depth and time are determined by the manufacturer). In a continuous water immersion environment, such as an offshore wind power project, choosing IP68 may extend the life of the equipment by more than 5 times.
Waterproof joint symbol selection steps
The following is a recommended process for Waterproof joint symbol selection, which can be presented in the form of an infographic:
Typical Waterproof joint symbol combination
Offshore wind power projects: It is recommended to use “IP68 + 316 stainless steel + anti-UV certification” to ensure the long-term stable operation of the equipment in high salt fog and high ultraviolet environments.
Chemical plant explosion-proof area: It is recommended to choose “ATEX/IECEx certification + IP67 or IP68” to ensure the safety of the equipment in explosive environments.
Extreme cold environment: It is recommended to use “-40°C▲ + IP68” to ensure that the equipment can still work normally under low temperature conditions.
Every batch of ATEX-certified products is equipped with a unique traceability code. By scanning the code via mobile app or web portal, clients can:
We implement laser engraving technology to transform standard symbols into brand-specific assets:
COMPANY_IP68_2025Q3)We provide FREE symbol education kits to bridge technical gaps:
Physical Components
Digital Resources
Value Delivered:
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When you interpret each Waterproof joint symbol on the cable connector, you are not only choosing the product itself, but also a complete set of industrial guarantee systems behind it that have undergone 342 rigorous tests. From the IP68 sealing test under 300 meters of water pressure in the deep sea to the material performance verification in the extremely cold environment of -50°C; from the 1000-hour continuous combustion experiment required by the explosion-proof certification to the micron-level tolerance control of the thread accuracy – these symbols carry not only technical parameters, but also a solemn commitment to safety, reliability and responsibility.
Our value lies in converting cold codes into traceable trust: behind each ATEX certification mark is a 72-hour uninterrupted explosion-proof pressure test video; under each set of IP grade numbers, there is salt spray corrosion data repeatedly verified in the laboratory. When you choose these symbol combinations, you actually get support covering the entire life cycle of the product – from the precise matching of thread specifications during the installation phase to the anti-aging performance guarantee in extreme environments, and even the traceability of spare parts 20 years later.
This is not only a product competition, but also an upgrade of industrial logic. What we convey through Waterproof joint symbol is the certainty verified by 342 processes, the confidence to reduce the risk of downtime of oil platforms by 3%, and the precise guarantee for medical equipment to achieve zero electromagnetic interference. The next time you see these Waterproof joint symbol, please remember: they are not only marks on the connectors, but also our silent oath to work with you to protect safe production and efficient operation and maintenance.