Cable Calcs Etc

What is the maximum volts-drop for a 230v lighting circuit?

• 5%

• 3%

• 10%

• 7%

What does RCBO stand for?

• Residual Current Breaker with Overload

• Residual Current Circuit Breaker

• Residual Current Device

• Residual Current Breaker with Overload and Short-circuit protection

What is the rating of an RCD for additional protection?

• 10mA

• 50mA

• 20mA

• 30mA

What is the maximum volts-drop for a 230v non-lighting circuit?

• 5%

• 7%

• 3%

• 10%

What does Ib stand represent?

• Tabulated Current

• Protective Device Rating

• Design Current

• Current

What does In stand for?

• Protective Device Rating

• Design Current

• Tabulated Current

• Current

What does CSA stand for?

• Cross Sectional Application

• Cable Size Applicable

• Cross Sectional Area

• Calculate Size Application

​ ​ (a)   > ​ (b)   > (c)   > ​ (d)  

​

• It
• Iz
• In
• Ib

Step 1 for cable calculations is to

• Select the Protective Device Rating

• Calculate the Design Current

• Apply Derating Factors

• Select a Cable

The Units for Power is .....

• Joules

• Volts

• Ohms

• Watts