Cable Calculations

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

Name this type of cable

• Steel Wire Armour

• PVC Sheathed

• Mineral Insulated

• SY Flex

Name this Type of Cable

• Mineral Insulated Cable

• PVC Sheathed Singles

• PVC Twin & Earth

• PVC Sheathed Twin & CPC

What is the relationship between BS7671 & Electricity at Work Regulations?

• If I follow BS 7671 I am more than likely to comply with EAWR

• BS 7671 is Statutory

• EAWR is Non Statutory

​ What does Ca Stand for in terms of Cable Calculations?