POWER DISTRIBUTION BASICS

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POWER/ DISTRIBUTION BASICS

• ELECTRICITY at the BUILDING
• S/R Sect 26.1-26.7
• 26.28- 26.33
• 26.38-26.39
• Review all of Sect. 27

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POWER Distribution
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Central Fossil Fuel Plant
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Substation
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POWER, LIGHTING, DENSITY, FORM ??
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Large Building Block Diagram Major component- not
full detail diagram When spatial relations are
shown it is a Riser diagram When Electrical
symbols are used(instead of blocks) it is a
Single line diagram
S/R Figure 15.1- (27.1) 10th
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Large Building Service S/R Figure 15.1- (27.2)
10th
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Raised floor distribution
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Electric Load Chart
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Distribution lines
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Wire/ Cable sizes sizes
Cable - conductor 6AWG or larger or several
conductors, assembled into a single unit, of any
size Wire- a single conductor 8AWG or smaller
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Wire codes on sheathing
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Service Panel 60 Amp Fuse Panel 1950-65 1-240V
appliance Typically updated to 100 Amp service
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Circuit Breaker Panel 100 amp service Min in
residential design SubPanels can be added for
additional service Breakers switch
individual Circuits Main Breaker at top Circuits
(demand loops)are Assigned to each circuit and
Identified on panel cover
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