Electrical Design

which one of the following types of circuit would a 24v fire alarm circuit be classes as

• low voltage

• high voltage

• distribution

• safety circuit

which one of the following is the maximum length of span, between two buildings, where the wiring system is thermoplastic sheathed cables without any intermediate support

• 1m

• 3m

• 30m

• 15m

which one of the following is the trunking factor for determining the capacity for a 75mm x 38mm trunking

• 767

• 1146

• 1555

• 2091

which one of the following devices would not operate if there was a short circuit

• RCD

• RCBO

• HRC Fuse

• semi-enclosed fuse

which one of the following is the trunking factor for determining the capacity for a 100 x 50mm trunking

• 993

• 1542

• 3189

• 2091

the earth return path within the suppliers cable of a TN-C-S system is the

• earth conductor

• cable sheath

• pen conductor

• installation earth electrode

which one of the following is most likely used as a CPC

• PVC trunking

• single core conductor

• flexible conduit

• hot & cold water pipes

which one of the following defines the term `exposed conductive part`

• an insulated part forming part of the electrical installation

• a conductive part forming part of the electrical installation

• an insulated part which is not part of the electrical installation

• a conductive part which is not part of the electrical installation

which one of the following defines a metal conduit system which is fixed on a wall where it drops for a light switch

• exposed conducting part

• insulated part

• unearthed conductive part

• extraneous part

which one of the following is the most common material used for cables suspended by pylons used for transmission systems

• brass

• copper

• steel

• lead