electrical power distribution. forms of energy all forms of energy fall under two categories...

Electrical Power Distribution

Forms of Energy

All forms of energy fall under two categories

POTENTIALStored energy or energy

of position(gravitational)

KINETICEnergy of motion (motion of waves,

electrons, atoms, molecules, and substances)

Work Power

Electrical Power is measured in Watts (W) or kWatts (kW)

W = joule per second

Work is done when a force that is applied to an object moves that object. The work is calculated by multiplying the force by the amount of movement of an object (W = F * d).

Power Generation

Power Transmission Lines

Power Generation and Transmission

Electrical Systems Incoming Service - Power Switchgear / Distribution Equipment Feeders Grounding Motor Br. Branch/Equip. Connect Emergency Generators / ATS / UPS Lighting Fixtures / Lighting Control Devices - Lighting Devices - Power Lighting Branch Power Branch Fire Alarm System Site Lighting Telephone / Data Conduit Incoming Service - Telephone

Electrical Terms

Utility Power XFMR Switchboard Panelboard Motor Control Center Disconnect Switch Transformer Circuit Breaker Feeder One-Line Diagram Equipment Connection

Branch Circuit Homerun Receptacle Switch Automatic Transfer Switch Generator UPS

Electrical Symbols

10

Service equipment is the electrical equipment that constitutes the main control and means of power cutoff to the electric service (normally Power Company supply) brought into the building.

Service Equipment

11

All buildings have an electrical service.

Primary service (utility company) is shown on the one-line diagram.

A utility transformer is installed outside the building on a pad (site drawing) or pole.

Incoming Service - Power

12

Incoming Service - Power

13

Incoming Service - Power

14

Common Electrical Distribution Systems

Common Electrical Distribution Systems

Common Electrical Distribution Systems

Common Electrical Distribution Systems

Common Electrical Distribution Systems

Common Electrical Distribution Systems

1φ2W, 240 Vac1φ3W, 120/240 Vac3φ3W, 240 Vac3φ3W, 240 Vac corner ground delta3φ4W, 208Y/120 Vac 120 x 3 = 208 V3φ4W, 480Y/277 Vac 277 x 3 = 480 V3φ3W, 480 Vac3φ4W, 600Y/347 Vac3φ3W, 600 Vac2W, 250 Vdc3W, 125/250 Vdc

Residential Power Distribution

Commercial and Industrial Power Distribution

Utility Primary Transformer

23

In-Coming Service - Power

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8 FeedersIncoming Service – power feeders

One-Line Diagram

Power Distribution System Equipment

Power Distribution System Equipment

30

Switchboard

Main Distribution Board (MDB)

32

Main Distribution Board (MDB)

Main Switchboard (MSB)

Incoming Section

Meter Main Section

Distribution SectionCircuit BreakersFusible Switches

Grounding

Bonding

Switchboard

Incoming Section

Meter Main Section

Distribution SectionCircuit BreakersFusible Switches

Grounding

Bonding

Switchboard

Incoming Section

Meter Main Section

Distribution SectionCircuit BreakersFusible Switches

Grounding

Bonding

In-Coming Service - Power

Incoming Section

Meter Main Section

Distribution SectionCircuit BreakersFusible Switches

Grounding

Bonding

Switchboard

Incoming Section

Meter Main Section

Distribution SectionCircuit BreakersFusible Switches

Grounding

Bonding

Switchboard

Incoming Section

Meter Main Section

Distribution SectionCircuit BreakersFusible Switches

Grounding

Bonding

Switchboard

Incoming Section

Meter Main Section

Distribution SectionCircuit BreakersFusible Switches

Grounding

Bonding

Switchboard

Incoming Section

Meter Main Section

Distribution SectionCircuit BreakersFusible Switches

Grounding

Bonding

Switchboard

42

Panelboard

43

Panelboard

44

Panelboard

Primary Transformer

[480/277V 3ϕ 4W]

Power Panelboard

PanelboardsLighting, appliances, motor/equip

Step-Down Transformer

[120/208V 3ϕ 4W]

Main BreakerEnclosed

Disconnect

45

Panelboard

Motor Control Center (MCC)

Safety Switch - Disconnect Switch

Fusible or Non Fusible250V or 600V2 Pole or 3 Pole30A60A100A200A400A600A800A1200A

Disconnect Switch

4 & 6-Pole Heavy Duty Safety Switches

Two-speed, two-winding motors

4-pole switches are also used in 3-phase, 4-wire circuits when a switching neutral is required.

49

Disconnect Switch

Five Guys Burgers and Fries

Atlantic Food Company Example

E-6 One-Line Diagram/Switchboard Detail

E-7 Electrical Riser Diagram

E-5 Electrical Schedules

North State ElectricCompany Information

North State ElectricEstimating Procedures

Take Off Color Code

Estimate Setup Package

Forms:PricingTake Off SheetFeeder Take Off SheetMotor / Equip Branch Take Off SheetRFQ