Practicalities

Ground

• A ground is defined as an infinite source or sink of current
• If two elements are connected to ground, they form a circuit

Ground drawing

NEMA

• National Electrical Manufacturers Association
• Specifies plug types

Standard United States Plugs

Other NEMA Plugs

International Plugs

Plug Types

International wiring

• IEC 60446 (international electrotechnical commission)
• Brown - Hot
• Blue - Neutral
• Green/Yellow - Ground

Outlet wiring

Residential wiring

Residential wiring

Residential wiring

Circuit breaker

• Disconnects circuit if current reaches a threshold
• Allows for manual switching of current

Outlet wiring

• Are outlets wired in series or parallel?

Outlet wiring

Outlet wiring

240 Volt Outlet

Old wiring

Romex wiring

Ground wire

• Why do we have a ground wire?