Gas / duct / fiber material measurements
Electrical safety tutorial
Measures related to gas / ducts / fiber materials
It is very important to take into account the safety measures when working with gas, ducts, fibrous material. It is recommended that a person working with these wear the required safety gear and carry all the necessary tools.
Gas safety measures
The incident rate has reached 6% due to electrical enclosures at oil and gas companies around the world. Safety measures play an essential role and help to avoid electrical hazards.
For reliability and safety reasons, it is necessary to periodically check and maintain the electrical system in good condition after installation.
Proper care and experience is required for expansion, modification and renovation of existing facilities when working withc a direct factory.
It takes a professional to choose the perfect electrical equipment to install in a gas industry. For example, an HRC fuse is suitable for these industries instead of a kit-kat fuse.
The installation, design, testing and maintenance of electrical equipment must meet the standards of the respective nationalities to guarantee the expected quality as well as safety.
Conduit / Fiber Safety Measures
The conduit (s) are the cable tray and protect them.
Electrical conduits must follow the standard specifications of -
- ASTM F2160
- NEMA TC7
- UL 651A & B and UL 2024
- National Electrical Code (chapter 9)
It is essential to focus on the diameter of the duct ∓ interior duct, the number of interior ducts, the length anddirection, duct composition, coefficient of friction, blocking combination, pulling speed, temperature, elevation, inner duct weight, mechanical stress, tension and radii of curvature, etc.
Trained professionals should choose the conduits as per the requirement of the environment, including an underwater, underground, exterior or interior location. Use symbols for underground wiring that can keep people from digging and dealing with accidents.
The electrician should use a tensiometer, cable lubricants and the required electrical equipment.
Safety measures related to fiber material
Fiber optic cables must be handled with care with a good knowledge of the radius of curvature, and twist of the cable.
Use a laser beam to find damage in the cable de optical communication.
Do not stick broken cable ends or drop pieces of fiber on the ground. Avoid skin contact with the fiber material.
Remember not to eat or drink anything near the installation area.
Group classification of flammable gases / vapors
Flammable gas or vapor can be ignited by an arc or spark in the electrical system and lead to dangerous accidents. There are four Class I group classifications in section 500-5 (a) according to NEC.
Group A: Acetylene
Group B: Hydrogen and gases equivalent to a dangerous nature
Group C: Ethyl ether or gas or vapors equivalent to a hazardous nature
Group D: Gasoline, alcohol, acetone, natural gas and similar materials
These groups were formed according to the level of danger linked to the explosion pressures of the specific atmosphere. In addition, these engineers should follow the "Practice for Classification of Flammable Liquids, Gases, or Vapors" in NFPA 497.
Group Classification of Ducts
There are different types electrical conduits or conduits used for various applications.
Rigid Galvanized Conduit
Thick galvanized steel tubing protects electrical wiring and becomes an electrician's choice in commercial and industrial applications.
Electrical l tubes
These conduits are made of steel or aluminum and limited to a specific radius for bending. It is very popular in commercial, residential and industrial buildings.
Non-llic electric tubes
It is moisture resistant and flame retardant and it is easy to bend by hand due to its flexibility.
Flexible l duct
It's known as "Greenfield of flex " meaning it doesn't maintain permanent curvature. It is recommended for dry areas.
Liquid Tight Flexible Metal Conduit
These are covered with waterproof plastic coating which is applicable for general wiring in wet or damp locations.
Rigid l conduit
It is made of stainless steel or coated aluminum which prevents corrosion.
Flexible non-llic liquid tight conduit
These are the flame retardant type which is recommended as a raceway for the installation of approved conductors (600 volt gauge).
It is used in large amounts of water areas and areas prone to corrosion as it prevents corrosion.
It is resistant to moisture and corrosion, which also has the highest coefficient of thermal expansion.survey.
Based on the Electrical conduits of design and shape are classified as follows -
- Individual round pipe
- Extended plenum
- Reduction trunk
- Multiple return air
The following figure shows the differences between the supply duct systems -
La following figure shows a typical conduit connection and a -
- Reducer Tee
1. The Class I group classification of flammable gases / vapors / liquids is described in ______.
a) NFPA 70
b) NEC Article 500
d) None of the above
2. To which group does flammable hydrogen gas belong?
a) Group D
b) Group C
c) Group B
d) Group A
3. Which of the following is known as “Greenfield Flex”?
a) Conduit flexible llic liquid tight
b) Galvanized rigid conduit
c) PVC conduit
d) Flexible l conduit