Electrical Systems Basics
LESSON 15 | CHAP 15
BUILDING SYSTEMS FOR INTERIOR DESIGNERS
Electricity + Interior Design Integration
Safety, Function, and Efficiency
Electrical System Basics
Why Electrical Systems Matter
Electricity powers lighting, HVAC, appliances, and communication
Critical to function, safety, and ambiance
Interior designers ensure:
• Power is available where needed
• Systems are safe + code-compliant
• Lighting supports design intent
Indicate: • Receptacles, switches, lighting • Equipment + electrical needs Understand: • Panel locations • Wiring constraints • Emergency systems
Role of the Interior Designer
Coordinate with architects & electrical engineers
Electricity = flow of electrons
Requires:
• Conductor (metal)
• Closed circuit
Materials:
• Conductors (copper, aluminum)
• Insulators (plastic, glass)
Basic Electrical Concepts
A closed circuit allows current to flow, but an open circuit leaves electrons stranded.
Key Terms
Voltage (V): electrical pressure Current (Amps): flow of electricity Resistance (Ohms): opposition to flow Power (Watts): energy use rate Energy: measured in kWh
Electrical Circuits
Circuit = closed loop of electricity
Types:
• Series: one path (failure stops all)
• Parallel: multiple paths (standard in buildings)
Short circuit: unintended path → dangerous heat
An electrical circuit is a complete conductive path that allows electrical current to flow from a power source through a device (load) and back to the source. Current will only flow if the circuit is complete (closed) back to the source.
Direct Current (DC):
• One-direction flow
• Used in batteries, solar
Alternating Current (AC):
• Reverses direction
• Standard building power (60 Hz in U.S.)
AC vs DC Power
Power generated → transmitted → stepped down
Typical building:
• High voltage → transformer → 120/240V
Designers must understand:
• Panel locations
• Circuit distribution
Electrical Distribution Overview
Electrical drawings include:
• Lighting layouts
• Receptacles & switches
• Data/communication systems
Interior designers produce:
• Power plans
Electrical Plans & Coordination
Coordination is essential across disciplines
NEC (National Electrical Code): • Safety requirements (legally enforced) ANSI & NEMA: system standards
• UL: product testing + approval
Codes and Standards
Always specify UL-listed products
Main risks:
• Fire from overload/short circuit
• Electrical shock
Design considerations:
• Proper wiring
• Safe material selection
• Code compliance
Electrical Safety Basics
Grounding
Provides safe path for stray electricity Three wires: • Hot (power) • Neutral (return) • Ground (safety) Prevents shock + equipment damage
Circuit Protection
Fuses:
• Melt when overloaded
Circuit breakers:
• Trip and reset
Protect against:
• Overloads
• Short circuits
• Fire hazards
GFCIs & Surge Protection
GFCI (Ground-Fault Circuit Interrupter):
• Shuts off power instantly if leakage detected
• Required in wet areas (bathrooms, kitchens)
Surge protectors:
• Protect electronics from voltage spikes
Sustainable Electrical Systems
Photovoltaic (solar): Converts sunlight to electricity (DC → AC)
Sustainable Electrical Systems
Wind energy: Turbines generate power
Sustainable Electrical Systems
Net metering: Sell excess energy to grid
key takeaways
Coordinate with architects & electrical engineers
Source + Assist in specifying electrical systems
• Always specify UL-listed products
Although this provides only a brief overview of the principles of electricity, grasping this information can enhance your communication with electrical engineers and other members of the building team. Next, we will explore how electricity is distributed throughout a building.
CONDUIT
Stanley Saitowitz | Natoma Architects Inc. San Francisco, California
Conduit Restaurant emerged from the found circumstances. The ground floor commercial space in a new residential building had a low ceiling and a tangled maze of plumbing, sprinkler and electrical conduits serving the residences above. To cover these pipes would have further reduced the space. Instead, even more conduits were layered over the existing to counteract and remediate the situation.
Electrical Systems Basics
Maryse Jospitre
Created on February 27, 2026
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Transcript
Electrical Systems Basics
LESSON 15 | CHAP 15
BUILDING SYSTEMS FOR INTERIOR DESIGNERS
Electricity + Interior Design Integration
Safety, Function, and Efficiency
Electrical System Basics
Why Electrical Systems Matter
Electricity powers lighting, HVAC, appliances, and communication Critical to function, safety, and ambiance Interior designers ensure: • Power is available where needed • Systems are safe + code-compliant • Lighting supports design intent
Indicate: • Receptacles, switches, lighting • Equipment + electrical needs Understand: • Panel locations • Wiring constraints • Emergency systems
Role of the Interior Designer
Coordinate with architects & electrical engineers
Electricity = flow of electrons Requires: • Conductor (metal) • Closed circuit Materials: • Conductors (copper, aluminum) • Insulators (plastic, glass)
Basic Electrical Concepts
A closed circuit allows current to flow, but an open circuit leaves electrons stranded.
Key Terms
Voltage (V): electrical pressure Current (Amps): flow of electricity Resistance (Ohms): opposition to flow Power (Watts): energy use rate Energy: measured in kWh
Electrical Circuits
Circuit = closed loop of electricity Types: • Series: one path (failure stops all) • Parallel: multiple paths (standard in buildings) Short circuit: unintended path → dangerous heat
An electrical circuit is a complete conductive path that allows electrical current to flow from a power source through a device (load) and back to the source. Current will only flow if the circuit is complete (closed) back to the source.
Direct Current (DC): • One-direction flow • Used in batteries, solar Alternating Current (AC): • Reverses direction • Standard building power (60 Hz in U.S.)
AC vs DC Power
Power generated → transmitted → stepped down Typical building: • High voltage → transformer → 120/240V Designers must understand: • Panel locations • Circuit distribution
Electrical Distribution Overview
Electrical drawings include: • Lighting layouts • Receptacles & switches • Data/communication systems Interior designers produce: • Power plans
Electrical Plans & Coordination
Coordination is essential across disciplines
NEC (National Electrical Code): • Safety requirements (legally enforced) ANSI & NEMA: system standards • UL: product testing + approval
Codes and Standards
Always specify UL-listed products
Main risks: • Fire from overload/short circuit • Electrical shock Design considerations: • Proper wiring • Safe material selection • Code compliance
Electrical Safety Basics
Grounding
Provides safe path for stray electricity Three wires: • Hot (power) • Neutral (return) • Ground (safety) Prevents shock + equipment damage
Circuit Protection
Fuses: • Melt when overloaded Circuit breakers: • Trip and reset Protect against: • Overloads • Short circuits • Fire hazards
GFCIs & Surge Protection
GFCI (Ground-Fault Circuit Interrupter): • Shuts off power instantly if leakage detected • Required in wet areas (bathrooms, kitchens) Surge protectors: • Protect electronics from voltage spikes
Sustainable Electrical Systems
Photovoltaic (solar): Converts sunlight to electricity (DC → AC)
Sustainable Electrical Systems
Wind energy: Turbines generate power
Sustainable Electrical Systems
Net metering: Sell excess energy to grid
key takeaways
Coordinate with architects & electrical engineers
Source + Assist in specifying electrical systems
• Always specify UL-listed products
Although this provides only a brief overview of the principles of electricity, grasping this information can enhance your communication with electrical engineers and other members of the building team. Next, we will explore how electricity is distributed throughout a building.
CONDUIT
Stanley Saitowitz | Natoma Architects Inc. San Francisco, California
Conduit Restaurant emerged from the found circumstances. The ground floor commercial space in a new residential building had a low ceiling and a tangled maze of plumbing, sprinkler and electrical conduits serving the residences above. To cover these pipes would have further reduced the space. Instead, even more conduits were layered over the existing to counteract and remediate the situation.