1. SmartScreen
L1 Certificate in Access to Building Services
Engineering Unit 104 Worksheet 7
Unit 104: Introduction to building services engineering
Worksheet 7: Electrical systems
Explain the function of the two main electrical systems and why their effective
performance is important to the building and its occupants. Describe the overall purpose
of the systems and their inclusion in a building
The two main electrical systems are...
 Power supply systems
 Lighting systems