Low Voltage Temporary Electrical Installation

introduction
BS 7909 deals specifically with setting-up and use of temporary electrical systems in the events and entertainment industry. Temporary electrical systems are typically required to be set-up hastily in challenging conditions, which in turn leads to a heightened risk of damage or other problems. BS 7909 therefore requires systems to be designed in accordance with the IET Wiring Regulations (BS 7671) so that adequate protection against the risks of electric shock, fire and interference are ensured.
OBJECTIVES
By the end of this training course, participants will be able to:
• Recognize roles of competent persons
• Explain characteristics and operations of fuses and circuit breakers
• Determine factors for voltage drop and earth impedances
• Understand the importance of earthing and bonding
• Review the cables and connectors
Course Outline
DAY 1
Identification of competent and authorized persons
• Requirements for competent and responsible person
• Criteria and areas of responsibilities of competent electrical worker
• Requirements for handover
• Tasks identified and executed before handover
• Understanding of direct and indirect contact
• Electric shock hazards
DAY 2
Methods and impacts of effective earthing and bonding
• Earthing and equipotential bonding
• Earthing methods and network designs
• Automatic disconnection of supply
• Operations of fuses and circuit breakers
• Simple and complex systems
• Standby diesel generators and utility transformers

DAY 3
Appropriate cable and connector selection for designated wiring systems
• Connector type and use
• Illustrate the merits of various types of cable connectors
• Cable selection and use
• Common low voltage cable characteristics
• Installation Practices
• Conduit and trucking system

DAY 4
Impact of volt drop and earth fault current
• Factors associated with volt drop
• Calculating volts drop
• Earth fault loop path
• Understanding of Ze and Zs and their relevance
• Problem-solving
• Trouble shooting and common diagnostic instrument

DAY 5
Impact of volt drop and earth fault current
• Factors associated with volt drop
• Calculating volts drop
• Earth fault loop path
• Understanding of Ze and Zs and their relevance
• Problem-solving
• Trouble shooting and common diagnostic instrument