BASIC ELECTRICITY 101
Kevin Booker, Executive Director
State Electrical Division of Nebraska
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An overview of electrical hazards and ways to mitigate them. It covers topics such as single phase electric panels, National Electrical Code requirements, and hazards and risks of electricity. The document also includes information on shock and its effects, as well as protection from abnormal conditions.
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2021/2022
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BASIC ELECTRICITY 101
Kevin Booker, Executive DirectorState Electrical Division of Nebraska
Review some typical hazardsassociated with electricity andlearn how to mitigate thehazards. OBJECTIVES
SINGLE PHASE ELECTRIC PANEL
The following drawing shows howcircuit breakers access theincoming power:
ELECTRIC
PANEL
Main Breaker
Bus Bars
Neutral
Ground
Main Power240v / 120v -1Ø
Double PoleCircuit Breaker240v
240v Circuit
120v Circuit
Single PoleCircuit Breaker120v
I = V/R
So a 2000 watt UPS will draw howmany amps?
2000/120 =16.66 amps
A standard 20 amps outlet isdesigned to carry 80%, thatwould be 16 amps.How much additional load will thiscircuit handle?
Rated?
Listed
Venting
NEC 110.13. Mounting and Cooling ofEquipment. This requirement is always in dispute, itseems. Cramming equipment into anovercrowded arrangement to maximizerevenue per square foot sounds like areally good idea until that equipmentstarts failing left and right, or the wholeplace just burns down.
NATIONAL ELECTRICAL CODE
Do YOU push the test buttonon GFCIs and AFCIs monthly?It’s HARD to rememberwithout calendaring the task!
NEC 110.3. Examination, Identification,and Use of Equipment. This section gives8 requirements for examination in part(A). In (B), it says "Listed or Labeledequipment shall be installed and used inaccordance with any instructionsincluded in the Listing or Labeling." In other words, use the product asintended. Unauthorized modificationsvoid the Listing and expose the modifierto civil, and potentially criminal, litigationand liability.