ICIT: Electrical Final Circuit and Wiring system

The severity of an electric shock is determined by the amount of the current flow which, in turn, is governed by the

• wire resistance.

• size of body.

• mass of body.

• circuit resistance and the voltage.

The human body can sense a current of around

• 1 mA.

• 20 mA.

• 30 mA.

• 50 mA.

ISO 3864 defines four basic formats for safety signs. Identify the particular type of safety message.

• Warning sign

• Prohibition sign

• Mandatory action

• Safety information Sign

State the common accessories use in installation in industrial premise.

• Silcon conduit and pipe.

• Plastic conduit and box.

• rubber pipe and duct.

• metal trunking and metal conduit.

For wire in metal trunking , should not filled more than

• 20%

• 45%

• 60%

• 90%

The common standard sizes of conduit are

• 1.5mm, 2.5mm

• 10mm, 30mm

• 20mm, 25mm

• 35mm, 63mm

The inner radius of the conduit bend not be less than

• 0.5 times the conduit outside diameter.

• 2.5 times the conduit outside diameter.

• 5 times the conduit outside diameter.

• 10 times the conduit outside diameter.

All cables of an alternating current circuit must be contained in the

• same conduit.

• different conduit.

• same box.

• different boxes.

Conduit must be completely installed and firmly fixed before

• any tests are done.

• call for inspection.

• supply is turn on.

• any cables are drawn in.

Metallic Conduit system should be connected to the earthing system to protect against

• direct contact shock.

• indirect contact shock.

• electrical contact shock.

• indirect contact shock.