1. Computer Networking
2. Internet (Ethernet Cable, Fiber Cable)
3. CCTV & Security System
In general, but not limited to, electricians:
read and interpret electrical, mechanical and architectural drawings, specifications, and applicable codes to determine wiring layouts,
cut, thread, bend, assemble and install conduits and other types of electrical conductor enclosures and fittings, pull wire through conduits and holes in walls and floors, position, maintain and install distribution and control equipment such as switches, relays, circuit breaker panels and fuse enclosures, install, replace, maintain and repair electrical systems and related electrical equipment,
install data cabling, splice, join and connect wire to form circuits, test circuits to ensure integrity and safety, install and maintain fibre optic systems and, install, replace, maintain and repair electrical generation sources and related equipment, and may specialize in renewable energy (eg. wind/solar).
Some electricians work in specific types of installations:
residential (housing developments),
commercial (office buildings),
institutional (hospitals), and
industrial (plants, factories).