Cable Calculations

Maximum disconnection time for a 32A submain 230V

• 0.1s
• 0.4s
• 1s
• 5s

Maximum disconnection time for a 16A immersion 230V.

• 0.1s
• 0.4s
• 1s
• 5s

Evie is setting up a new electrical system in her home and has chosen a 25 sqmm line conductor. Select an appropriate earthing conductor size for her setup.

• 16 sqmm

• 25 sqmm

• 10 sqmm

• 6 sqmm

State the INSTALLATION METHOD for a cable installed in conduit on a wall

• method B
• method A
• method E
• method C

Evie is calculating the 'tabulated current' for an electrical circuit. Select the correct formula she should use.

• Ib/correction factor

• In/correction factor

• It x correction factor

• Ib x correction factor

A circuit has a Ze value of 0.55 ohms. If the (R1+R2) value is 0.85 ohms, state the value of Zs for the circuit

• 0.9 ohms
• 1.4 ohms
• 0.3 ohms
• 1.55 ohms

Identify the correct symbol for the rating of the protective device

• In
• Ib
• Iz
• It

Anaya is working on an electrical project and needs to select an appropriate earthing conductor size for a circuit with a 50 sqmm line conductor. What size should she choose?

• 25 sqmm

• 10 sqmm

• 6 sqmm

• 50 sqmm

State the INSTALLATION METHOD for a cable buried in ducting

• method F
• method C
• method A
• method D

Identify the correct symbol for the rating of the 'tabulated current', where correction factors have had to be applied

• It
• In
• Iz
• Ib