4th year
Help!
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| Class one copper lightning protection terminals have a min.diameter of | 3/8 inch
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| Class 2 copper air terminal | 1/2 inch
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| Class 1 aluminum air tetminal | 1/2 inch
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| Class 2 aluminum air terminal | 5/8 inch
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| Class 1 | 75' or lower smaller than class 2
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| Class 2 | 75' larger and heavier
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| Ground Rods min. Depth | 10 ft.
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| What needs to be at least 10 inches above the object of area its protecting of lightning strikes | The tip of the air terminal
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| For lightning protection systems all structures require at least 2 down conductors and at least one additional down conductor | For every 100 ft. Of roof perimeter over 250 ft.
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| NFPA _______ is the standard for the installation of lightning protection systems | 780
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| 4 main parts of lightning protection systems | 1.intercept 2.strike termination devices3.termunal4.lightning rods
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| 2nd part lightning strikes down the building.includs the bonding of metallic bodies to a LPS conductors in an attempt to keep all metallic components at ___________during lightning strike event | Equal potential
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| 3rd part | Disperses lightning strike safety to earth materials,ground rods electrodes,ground rings,radials
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| 4th part | Surge suppression devices to dispose of ant unwanted electrical currents attempting to enter the building through conductive wiring
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| Bimetallic can't be used within______ of earths surface | 18 inches
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| Ground ring electrode | Conductor encircles a structure that is in direct contact with earth
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| If you have pride you also have to have | Effort and dedication
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| Labelled | It means there is some sort of symbol or identifying mark from an organization that is acceptable to AHJ
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| Listed | When it is on a list published by an organization
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| Loop conductor | A conductor that encircles a structure that interconnecs ground electrodes
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| Depth of topsoil before encasement in concrete | Less than 18 inches
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| How many feet between supports of cables | 3ft.
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| Air terminals that extend 24 inches above an object are permitted to be in place of intervals not exceeding ______ | 25 ft.
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| Lightning protection in a basement and crawl space? | Close as possible to outer perimetet
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| Bonding conductor | A conductor used for potential equalization between grounded metal bodies and a LPS
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| The surge protection devices installed at a service entrance have a min rating of 40 ka and a nominal discharge of | 20 ka
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| Main conductor | A conductor that carries lightning currents between strike terminations devices and grounding electrodes
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| What is not found on a motor plate | VA
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| The output of an alternator is controlled by a stator or rotor wire length strength of magnetic field | Speed of motor RPM,speed of generator
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| Magnetic flux is densist and magnetic force is strongest | At the poles north pole to south pole
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| Change the direction of DC motor | Commutator
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| Change the direction of ac motor | Switch the legs
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| Trouble shooting motors use a | Digital multi meter
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| What is connected to the rotor of a wound rotor motor specifically the set of secondary resistor | Slip rings
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| 1 HP = | 746 watts
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| The actual voltage applied to s motor should be within plus or minus_____ of the motors nameplate voltage | 10%
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| Motor power is rated in | Horsepower/watts
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| Motor A | Normal starting torque and normal starting current
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| Motor B | Normal starting torque low starting current *most common
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| Motor C | Has a high starting torque and low starting current
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| Motor D | High starting torque high slip and low starting current
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| A _______ DC motor has the highest starting torque characteristic | Series
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| In a 2 pole single phase motor the start winding is placed ____ from the run winding | 90 degrees
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| In a capacitor start motor forward and reverse I'd controlled by a | Drum switch
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| The _______ of a squirrel cage induction motor are short ckt | Rotor windings
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| The ______ of a wound rotor motor ate not short ckt | Rotor windings
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| The _______is used in a DC generator to keep the polarity and output in one direction | Commutator
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| Overload relay | Time delay devices that allow temporary overloads without disconnecting the motor
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| Primary colors | Blue green red
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| Secondary colors | Cyan magenta yellow
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| How do u measure lighting | Footcandles
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| What lighting is adjustable | A symmetrical
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| The visual task occurs at the ______ in the kitchen | Counter level
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| Lumen maintenance | Describes how long a light source will retain its own lumen output
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| What is SAD | Seasonal affective disorder
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| SAD and circadian are known as what type of issue | Photo biological disorfet
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| Argon and crypton | Combined with vaporized mercury produce visible light with phosphor
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| Chief disadvantage to use his and electromagnetic ballast lifting systems is | Lumen maintenance
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| Configurable relay | Relay designed to accept additional sets of contacts called add ons
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| Machine control relay | Electromagnetic relay that consists of several contacts typically 2-8 up to 12
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| Interposing relay | A really that enables the energy in a high power ckt to be switched by a low power control signal
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| Recommended d.b. for hazardous situation | 25 above ambient sound
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| What % of the world used motors | 63%
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| Type of enclosures | Type 1 I door,2 outdoor,3 both 4 submerged
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| Size holes iec | 16 or 22.5 smaller
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| Nema | 30.5 larger
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