Electrical Distribution
LESSON 16 | CHAP 16
BUILDING SYSTEMS FOR INTERIOR DESIGNERS
Understand components of electrical distribution systems
Identify key equipment and terminology
Recognize the interior designer’s role
Apply electrical planning to space design
Learning Objectives
What is Electrical Distribution?
System that delivers electricity throughout a building
Powers:o Lighting
o HVAC equipment
o Appliances and devices
Includes power + communication systems
1. Electrical Power System
o Supplies energy to building
2. Communication/Signal System
o Data, phone, TV
Two Main Electrical Systems
Interior designers mainly coordinate with power systems, but must consider both
Major System Components
Service entrance equipment
o Transformers, meters, disconnects
Distribution equipment
o Conductors, raceways
Loads
o Lighting, motors, outlets
Electrical Design Process
Electrical engineer: o Calculates load requirements o Determines service entry Interior designer: o Provides furniture layouts o Identifies equipment needs
Collaboration is essential early
Electrical Drawings
Show:
o Outlets
o Switches
o Equipment
Interior designers contribute:
o Receptacle locations
o Special equipment needs
Layout drives electrical planning
Power path:
1. Utility transformer
2. Meter
3. Main service panel
4. Distribution panels
5. Branch circuits
Service Entrance & Power Flow
Typical residential: 120/240V, 3-wire system
Transformers
o Adjust voltage levels
Meters
o Measure energy use
Switchboards / Switchgear
o Distribute bulk power
Panelboards
o Divide power into circuits
Key Equipment
Located in:
o Utility rooms
o Corridors
o Electrical closets
Design considerations:
o Accessibility (code required clearance)
o Aesthetics (flush vs surface mount)
o Coordination with walls and millwork
Panelboards & Interior Design
Contain:
o Panels
o Transformers
o Communication equipment
Must provide:
o Clearance (min. ~4 ft working space)
o Ventilation and lighting
o Fire-rated enclosure
Electrical Closets
Avoid placing in primary design focal areas
Deliver power to end uses
Types:
o Lighting circuits
o Appliance circuits
o General-purpose circuits
Design guidelines:
o Keep runs under ~100 ft
o Separate lighting + equipment loads
Branch Circuits
Receptacles & Layout Planning
Placement depends on: o Furniture layout o Function of space Examples: o Offices: per square footage o Retail: per 300 sq ft
• Avoid: Overuse of extension cords
Wiring Systems & Materials
Conductorso Copper (common)o Aluminum (lightweight, less common in interiors) Cableso NM (Romex) – residentialo BX (armored) – commercial Racewayso Conduits, trays Interior impact: exposed vs concealed systems
Coordinate:
o Outlet locations with furniture
o Lighting controls with user experience
Address:
o Visible devices (plates, switches)
o Open ceilings and exposed wiring
Plan for:
o Flexibility and future technology
Interior Design Considerations
Energy & Sustainability
Strategies:
o Load control systems
o Smart meters
o Energy management systems (EMCS)
Goal:
o Reduce energy use by 10–20%
Emergency Power Systems
Required for most buildings
Supports:
o Exit lighting
o Fire alarms
o Elevators
Types:
o Battery systems
o Generators
o UPS systems
Residential Design Considerations
Outlet spacing:
o Every 12 ft (max 6 ft from any point)
Dedicated circuits:
o Kitchen, laundry, HVAC
GFCI required in:
o Kitchens
o Bathrooms
o Exterior areas
Emerging Technologies
Wireless systems:
o Reduce need for wiring
Smart controls:
o Lighting automation
Underfloor systems:
o Flexible layouts for offices
key takeaways
Electrical systems are invisible but critical
Interior designers influence: Functionality, Safety, + Aesthetics
Early coordination = better design outcomes
Metal-clad cable (Type MC) is used where the use of BX (armored) cable is restricted. It has an additional ground wire, allowing for more applications.
Armored cable (Type AC) is flexible and consists of conductors wrapped in paper or plastic, covered by a metal jacket. It is commonly used in commercial applications and must be secured at intervals.
Fiber optic cable. Previously used mainly in low-voltage applications, but now it can be a conductor for electrical components. It contains thin strands of glass or plastic that carry light and may include an electrical cable, forming a composite cable
Fiber optic cable is essential for high-speed data transmission over long distances, serving as the backbone of internet, telephone, and cable services, enabling fast data transfer. It's also used in medical, automotive, and decorative lighting applications.
Romex is a trade name for non-metallic cable (Type NM). It consists of insulated conductors with a ground wire, all surrounded by moisture-resistant plastic material. Its use is mainly limited to single-family and multi-family homes up to three stories.
Flat cable (Type FCC) is a small cable used under carpet tiles. Its use is not permitted in wet or hazardous areas, as well as in residential buildings, hospitals, and schools.
Electrical Distribution
Maryse Jospitre
Created on February 27, 2026
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Transcript
Electrical Distribution
LESSON 16 | CHAP 16
BUILDING SYSTEMS FOR INTERIOR DESIGNERS
Understand components of electrical distribution systems
Identify key equipment and terminology
Recognize the interior designer’s role
Apply electrical planning to space design
Learning Objectives
What is Electrical Distribution?
System that delivers electricity throughout a building Powers:o Lighting o HVAC equipment o Appliances and devices
Includes power + communication systems
1. Electrical Power System o Supplies energy to building 2. Communication/Signal System o Data, phone, TV
Two Main Electrical Systems
Interior designers mainly coordinate with power systems, but must consider both
Major System Components
Service entrance equipment o Transformers, meters, disconnects Distribution equipment o Conductors, raceways Loads o Lighting, motors, outlets
Electrical Design Process
Electrical engineer: o Calculates load requirements o Determines service entry Interior designer: o Provides furniture layouts o Identifies equipment needs
Collaboration is essential early
Electrical Drawings
Show: o Outlets o Switches o Equipment Interior designers contribute: o Receptacle locations o Special equipment needs
Layout drives electrical planning
Power path: 1. Utility transformer 2. Meter 3. Main service panel 4. Distribution panels 5. Branch circuits
Service Entrance & Power Flow
Typical residential: 120/240V, 3-wire system
Transformers o Adjust voltage levels Meters o Measure energy use Switchboards / Switchgear o Distribute bulk power Panelboards o Divide power into circuits
Key Equipment
Located in: o Utility rooms o Corridors o Electrical closets Design considerations: o Accessibility (code required clearance) o Aesthetics (flush vs surface mount) o Coordination with walls and millwork
Panelboards & Interior Design
Contain: o Panels o Transformers o Communication equipment Must provide: o Clearance (min. ~4 ft working space) o Ventilation and lighting o Fire-rated enclosure
Electrical Closets
Avoid placing in primary design focal areas
Deliver power to end uses Types: o Lighting circuits o Appliance circuits o General-purpose circuits Design guidelines: o Keep runs under ~100 ft o Separate lighting + equipment loads
Branch Circuits
Receptacles & Layout Planning
Placement depends on: o Furniture layout o Function of space Examples: o Offices: per square footage o Retail: per 300 sq ft • Avoid: Overuse of extension cords
Wiring Systems & Materials
Conductorso Copper (common)o Aluminum (lightweight, less common in interiors) Cableso NM (Romex) – residentialo BX (armored) – commercial Racewayso Conduits, trays Interior impact: exposed vs concealed systems
Coordinate: o Outlet locations with furniture o Lighting controls with user experience Address: o Visible devices (plates, switches) o Open ceilings and exposed wiring Plan for: o Flexibility and future technology
Interior Design Considerations
Energy & Sustainability
Strategies: o Load control systems o Smart meters o Energy management systems (EMCS) Goal: o Reduce energy use by 10–20%
Emergency Power Systems
Required for most buildings Supports: o Exit lighting o Fire alarms o Elevators Types: o Battery systems o Generators o UPS systems
Residential Design Considerations
Outlet spacing: o Every 12 ft (max 6 ft from any point) Dedicated circuits: o Kitchen, laundry, HVAC GFCI required in: o Kitchens o Bathrooms o Exterior areas
Emerging Technologies
Wireless systems: o Reduce need for wiring Smart controls: o Lighting automation Underfloor systems: o Flexible layouts for offices
key takeaways
Electrical systems are invisible but critical
Interior designers influence: Functionality, Safety, + Aesthetics
Early coordination = better design outcomes
Metal-clad cable (Type MC) is used where the use of BX (armored) cable is restricted. It has an additional ground wire, allowing for more applications.
Armored cable (Type AC) is flexible and consists of conductors wrapped in paper or plastic, covered by a metal jacket. It is commonly used in commercial applications and must be secured at intervals.
Fiber optic cable. Previously used mainly in low-voltage applications, but now it can be a conductor for electrical components. It contains thin strands of glass or plastic that carry light and may include an electrical cable, forming a composite cable
Fiber optic cable is essential for high-speed data transmission over long distances, serving as the backbone of internet, telephone, and cable services, enabling fast data transfer. It's also used in medical, automotive, and decorative lighting applications.
Romex is a trade name for non-metallic cable (Type NM). It consists of insulated conductors with a ground wire, all surrounded by moisture-resistant plastic material. Its use is mainly limited to single-family and multi-family homes up to three stories.
Flat cable (Type FCC) is a small cable used under carpet tiles. Its use is not permitted in wet or hazardous areas, as well as in residential buildings, hospitals, and schools.