Steel Conduit Systems Quiz

Which of the following is a disadvantage of steel conduit systems?

• They are easy to install.

• They are resistant to corrosion.

• They are expensive compared with some other systems.

• They are lightweight.

Answer explanation

Steel conduit systems are known for their durability, but they can be costly compared to alternatives like PVC or EMT. This higher expense is a significant disadvantage when considering budget constraints.

Which finish is not mentioned for steel conduit?

• Galvanised

• Black enamelled

• Painted

• Polished

Answer explanation

The finish 'Painted' is not typically mentioned for steel conduit, while 'Galvanised', 'Black enamelled', and 'Polished' are common finishes used to protect and enhance the appearance of steel conduit.

Which box type is designed to allow a conduit to pass straight through?

• Terminal Box

• Through Box

• Angle Box

• U-Box

Answer explanation

The Through Box is specifically designed to allow a conduit to pass straight through it, making it the correct choice. Other box types, like Terminal and Angle Boxes, serve different purposes.

What is the role of stocks and dies in conduit systems?

• Bending conduits

• Cutting conduits

• Threading conduits

• Painting conduits

Answer explanation

Stocks and dies are tools used for threading conduits, allowing for the creation of screw threads on the ends of pipes. This is essential for connecting conduits securely, making 'threading conduits' the correct answer.

What is a disadvantage of PVC conduit systems?

• Does not require painting

• Minimal condensation

• Care must be taken when gluing joints

• Excellent electrical properties

Answer explanation

A disadvantage of PVC conduit systems is that care must be taken when gluing joints. Improper gluing can lead to leaks or weak connections, compromising the integrity of the system.

Why might PVC conduit joints not be waterproof?

• If too much adhesive is used

• If insufficient adhesive is used

• If they are painted

• If they are too light

Answer explanation

PVC conduit joints may not be waterproof if insufficient adhesive is used, as this can lead to gaps that allow water to penetrate. Proper adhesive application is crucial for ensuring a watertight seal.

What is a characteristic of PVC conduit systems regarding maintenance?

• Requires frequent painting

• Does not require painting

• Needs regular cleaning

• Prone to rust

Answer explanation

PVC conduit systems are designed to be low-maintenance and do not require painting, unlike metal conduits that may need regular painting to prevent rust. This makes PVC a more convenient option for electrical installations.

What is the conduit factor for a 3.5 m run with four bends and a diameter of 32 mm?

• 311

• 563

• 404

• 720

Answer explanation

To calculate the conduit factor, use the formula: Length + (Bends x 1.5 x Diameter). For a 3.5 m run with four bends and a diameter of 32 mm, the calculation is 3500 + (4 x 1.5 x 32) = 563. Thus, the correct answer is 563.

What is the multiplication factor used for 4 off solid core 2.5mm² cables?

• 27

• 39

• 58

• 54

Answer explanation

The multiplication factor for 4 off solid core 2.5mm² cables is 39. This value is used to calculate the total current-carrying capacity of the cables in various applications.

What is the conduit size required according to Table E4?

• 20mm

• 25mm

• 30mm

• 35mm

Answer explanation

According to Table E4, the required conduit size is specified as 25mm, making it the correct choice among the options provided.