Transcript 346N_091404_panel_sizing_lighting_intro

1) I feel ______ that we will finish
electrical design today.
A.
B.
C.
D.
Happy
Sad
Indifferent
I didn’t know we were studying electrical
design
Branch Circuit Design
• Handout for Panel B (~Panel D in other
example)
• How to determine size of breaker?
• 125% increase in ampacity (safety)
• Allows for longer conductor length
• Some breakers have are for more than one leg (i.e.
higher voltage equipment)
• How to determine size of conductor?
• Same as earlier work – use breaker amperage
2)What does MLO imply?
A. The panel is a main panel that feeds other
panels.
B. The panel requires a main circuit breaker.
C. The panel is probably in a residential
building.
D. The panel is probably in a commercial
building.
E. The panel is used for higher voltage loads.
3) If the panel has aluminum feeders?
A. It won’t meet the NEC.
B. The feeders will be smaller than if it had
copper feeders.
C. The feeders will be larger than if it had
copper feeders.
D. The panel is probably in a commercial
building.
4) Why are neutral totals not the sum
of the power on each leg?
A. You don’t need to include the 125% sizing
factor when sizing the neutral
B. Not all of the current goes through the
neutral
C. Not all duplex outlets/lighting will be used
at the same time
Other Panels
• Examples in text for other panels
• Review guidelines for branch circuits
• (I won’t ask memory questions?)
Conduits for Branch Circuits
• Types
• AC or MC flexible armored conduit
• EMT rigid (thin wall) ½ to 4 inches
• IMC/Rigid (thick wall)
• Unless otherwise indicated can use conduit for
grounding
• Install conductors for all phases and neutral in same
conduit
• Can’t mix wiring (communications, etc.) in conduits
• Can’t use conduits smaller than 1 inch and no more
than 9 conductors in a conduit
Procedure
1.
2.
3.
4.
5.
Analyze building needs
Determine electrical loads
Select electrical systems
Coordinate with other design decisions
Prepare plans and specifications
Lighting in Text
• Chapter 1 – Introduction / lighting design
terms
• Chapter 2 – Photometrics
• Chapter 3 – Lighting technology
• Chapter 4 – Lighting design issues
• Chapter 5 – Daylighting
• Chapter 6 – Design examples (non-numeric)
• Chapter 7 – Design examples (numeric)
Lighting
• Describe why lighting is important
• Describe motivations for lighting
• Calculate basic lighting terms
• Photometrics
• List differences between fluorescent and
incandescent lamps
• IES Handbook
Source: DOE
Motivation
• Lighting represents a third of commercial
building energy use
• Lighting has been measured to influence:
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•
•
•
Worker productivity
Retail sales
Mood/emotion/comfort
Accident avoidance/safety
5) Which lamp will give off more
light?
A. 100 W incandescent > 85 W halogen > 14 W
CFL
B. 14 W CFL > 85 W halogen > 100 W
incandescent
C. 85 W halogen > 100 W incandescent > 14 W
CFL
D. 100 W incandescent > 14 W CFL > 85 W
halogen
6) Which lamp will draw the most
power
A. 100 W incandescent > 85 W halogen > 14 W
CFL
B. 14 W CFL > 85 W halogen > 100 W
incandescent
C. 85 W halogen > 100 W incandescent > 14 W
CFL
D. 100 W incandescent > 14 W CFL > 85 W
halogen
7) Which lamp will be the hottest?
A. 100 W incandescent > 85 W halogen > 14 W
CFL
B. 14 W CFL > 85 W halogen > 100 W
incandescent
C. 85 W halogen > 100 W incandescent > 14 W
CFL
D. 100 W incandescent > 14 W CFL > 85 W
halogen
8) Which lamp will be the most
efficient?
A. 100 W incandescent > 85 W halogen > 14 W
CFL
B. 14 W CFL > 85 W halogen > 100 W
incandescent
C. 85 W halogen > 100 W incandescent > 14 W
CFL
D. 100 W incandescent > 14 W CFL > 85 W
halogen
Other questions
• Will the 14 W compact fluorescent draw more
than 14 W because of the ballast?
• What is the power factor of each lamp?
Homework 2
• By completing this assignment, you should be
able to:
• 1)Design residential electrical systems
• Locate input data on appliances/devices
• 2)Size commercial electrical panels and electrical
systems
• 3)Differentiate lighting efficiency and efficacy