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Exam (elaborations)

NM ES-3 TEST QUESTIONS AND ANSWERS LATEST UPDATE

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NM ES-3 TEST QUESTIONS AND ANSWERS LATEST UPDATE

Institution
NM ES-3
Course
NM ES-3

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NM ES-3 TEST QUESTIONS AND ANSWERS
x x x x x




Whatxisxthexminimumxclearancextoxthexedgexofxaxwoodxstudxforxaxwirexhole?x–xanswer-
1x1/4xinches(NECx300.4xAx1)

Whatxisxthexminimumxseparationxbetweenxaxclassx1xfirexalarmxcircuitxconductorxandxaxclass
x2xorxclassx3xcircuit?x–xanswer-x1/4xinch




Axbasicxalarmxsystemxwillxhavex__xpowerxsources.x–xanswer-2

Whatxisxthexminimumxrequiredxclearancexbetweenxaxreceivingxantennaxandx250xvoltxlinexno
txinsulated?x–xanswer-2xFeet

Thexminimumxclearancexforxanxantennaxtoxotherxconductorsxis?x–xanswer-
2xFeetx(NECx810.13)

Howxfarxawayxmustxcommunicationsxcablesxbexfromxelectric,xlight,xorxpowerxconductorsx–
xanswer-2xinches




Whatxisxthexmaximumxblinkxratexonxaxstrobexlightxperxsecond?x–xanswer-
2x(NFPAx72x18.5.2.1)

Onxaxvoicexalarmxsystemxwhatxisxthexminimumxnumberxofxcyclesxitxhasxtoxreportxanxevacuat
ionxprocedure?x–xanswer-2x(NFPAx72x24.4.1.2.1)

Whatxisxthexminimumxrequiredxheightxforxaxproprietyxmanualxpullxfirexalarm?x–xanswer-
3x1/2xfeetxorx42xinches

Anxoverheadxfeederxmustxhavexaxclearancexofx__xfromxchimneys,xradio,xandxtelevisionxant
ennas.x–xanswer-3xFeetx(NECx225.19xB)

ThexNECxclassifiesxContinuousxLoadxasxequipmentxrunningxatxaxmaximumxloadxofx__x____
?x–xanswer-3xhours

Axcontinuousxloadxisxaxloadxwherexthexmaximumxcurrentxisxexpectedxtoxcontinuexforxaxcerta
inxlengthxofxtime.xThisxamountxofxtimexis?x–xanswer-3xhoursxorxmore

Thexminimumxheadxroomxofxworkingxspacexabovexservicexequipment,xswitchboards,xpanel
xboards,xorxmotorxcontrolxcentersxshallxbexatxleast:x-xanswer-6.5xfeet

, Whatxisxthexminimumxrequiredxseparationxbetweenxcommunicationxcablesxandxlightingxcon
ductors?x–xanswer-6xfeet

WhatxisxthexminimumxseparationxrequiredxbetweenxcoaxialxcablexinxaxCATVxsystemxandxlig
htingxconductorsx–xanswer-6xfeet

Onxaxradioxantennaxreceivingxstationxwhatxisxthexminimumxclearancexbetweenxlead-
inxconductorsxandxconductorsxformingxaxpartxofxaxlightningxprotectionxsystem?x–xanswer-
6xfeet

Whatxisxthexminimumxlengthxofxaxgroundingxrodxinxanxapplicationxofxlessxthanx50xvolts?x–
xanswer-8xFeetx(NECx250.5.2.5)




Utilityxownedxlow-
voltagexcommunication,xradio,xandxtelevisionxcoaxialxcablesxmayxpassxdirectlyxoverxaxpoolx
ifxatxaxminimumxheightxof:x-xanswer-10xfeet

Allxofxthexfollowingxisxacceptablexasxaxgroundxexcept?x–xanswer-
10xfootxgasxpipex(NECx250.5.2xA)

Anxantennaxisxinstalledxonxaxbuildingxforxsignalxreception,xwhatxisxthexsmallestxsizexcopperx
groundingxconductorxthatxwouldxbexpermitted?x–xanswer-10xGaugex(NECx810.21.8xH)

Electricalxconduitxburiedx18xinchesxbelowxgradexshallxhavexaxwarningxtapexatxhowxmanyxinc
hesxabovexthexconduit?x–xanswer-12xinchesx(NECx300.5xDx3)

Whatxisxthexsmallestxgroundxwirextoxtoxcommunicationsxboxx–xanswer-
14xAWGx(NECx830.100xAx3)

Whatxisxthexminimumxsizexgroundingxconductorxforxcommunicationsxcircuitsx–xanswer-
14xAWG

Whatxisxthexmaximumxintervalxthexfirexalarmxsignalxisxallowedxatxthexconsul?x–xanswer-
15xSecondsx(NFPAx72x23.8.1.3.1.1)

Whatxisxthexminimumxwirexsizexforxconnectingxbells,xsirens,xorxcontrolxcircuitry?x–xanswer-
18xAWGx(NECx760.49xA)

AccordingxtoxNECxclassx3xcircuitsxarexallowedxaxminimumxwirexsizexofxwhatxgauge?x–
xanswer-18xAWGx(NECx725.179xH)
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