Self-Contained – Single Point

Advantages:

• The installation is faster and cheaper
• Standard wiring material may be used
• Failure of mains supply due to cable burn-through will automatically trigger the affected emergency luminaire to come on

Central Battery Source

Advantages:

• Maintenance and routine testing is easier, with only one location to consider
• The life of a battery is between 5 and 25 years, dependent upon type
• Environmentally stable in a protected environment; the slave luminaire can operate at relatively high or low ambient temperatures