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NABCEP PV Installation Exam 1 With Correct Questions And Answers 2024
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NABCEP PV Installation Exam 1 With Correct Questions And Answers 2024
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NABCEP PV Installation Exam 1 WithCorrect Questions And Answers 2024
What .kind .of .ground .faults .do .most .inverters .detect? .- .correct .answer.DC .
- .Inverters .detect .dc .ground .faults. .Ac .ground .faults .are .detected .on .the .ac .side .of .the
.inverter .often .at .a .distribution .panel, .i.e., .main .service .panel, .load .center .or .switchgear.
Which .is .the .worst .design .error? .- .correct .answer.Different .tilt .angles .in .a .PV .source
.circuit
- .Different .tilt .or .azimuth .orientation .within .a .source .circuit .is .bad. .Series .connections
.
. should .not .have .different .orientations.
A .system .that .sits .on .a .flat/low-slope .rooftop .and .has .no .penetrations .is .called .a .- .correct
.answer.Ballasted .system .
- .Ballasted .systems .are .common .fat .low .slope .(fat) .roof .systems .that .are .not .penetrating
.the .roof. .A .ballast .is .something .that .is .relatively .heavy .keeps .the .PV .from .blowing .away.
What .will .be .increased .by .reflective .surfaces .(albedo)? .- .correct .answer.Current
- .Reflections .and .increased .light .increases .current. .Reflected .light .can .also .be .called
.albedo
Which .room .cannot .have .a .PV .dc .disconnect? .- .correct .answer.Bathroom .
- .PV .dc .disconnect .not .allowed .in .bathroom .(think .of .wet .feet).
Best .sealant .for .residential .rooftop? .- .correct .answer.Polyurethane .
- .and .silicone .are .the .best .rooftop .sealants .(Polyurethane .is .even .better .than .silicone).
.Silicone .is .a .sealant; .silicon .is .what .solar .cells .are .made .of. .There .is .a .big .difference.
In .California .(west .of .the .zero-degree .isogonic .line) .the .north .needle .of .the .compass .will
.point? .- .correct .answer.East .of .true .North
, - .In .California, .magnetic .declination .is .to .the .east. .This .means .that .the .north .end .of .the
.
. compass .will .point .slightly .to .the .east.
If .an .array .is .facing .south .at .equinox .at .noon, .what .must .the .tilt .angle .be .in .order .for .the
.array .to .face .directly .at .the .sun .at .latitude .30? .- .correct .answer.30 .degrees
- .Explanation: .If .you .were .on .the .equator, .you .would .be .at .zero .latitude .and .the .sun .with
.
.be .right .over .your .head .at .solar .noon .at .equinox. .That .would .be .zero .latitude .with .a .zero-
degree .tilt. .If .you .were .1 .degree .latitude .north, .then .you .would .have .to .tilt .the .module .a .1
.degree .tilt .to .the .south .to .compensate .for .being .1 .degree .from .where .you .first .were. .If .you
.are .30 .degrees .north .and .the .sun .is .in .line .with .the .equator .(equinox), .then .you .would
.have .to .tilt .your .PV .module .30 .degrees .to .line .up .with .the .sun .at .solar .noon .at .equinox. .If
.you .were .at .90 .degrees .latitude .on .the .north .pole, .you .would .have .the .sun .on .the .horizon
.and .would .have .to .tilt .your .PV .at .a .90- .degree .tilt .to .directly .point .at .the .sun.
What .is ."blocking" .used .for? .- .correct .answer.Attaching .to .a .roof .in .a .place .where .there .is
.no .rafter
- .Blocking .is .done .by .roofers .when .they .need .to .add .a .block .to .get .the .strength .of .a .rafter
.
.when .making .an .attachment. .There .are .cases .where .a .solar .installer .wants .to .make .an
.attachment .in .a .place .on .a .roof .where .there .is .no .rafter, .so .they .can .take .a .block .of .wood
.and .fasten .it .to .adjacent .rafters .to .get .a .strong .connection. .Wooden .roofs .are .often .made
.with .rafters .and .on .top .of .the .rafters .is .a .roof .deck, .which .is .often .made .of .plywood .or
.oriented .strand .board .(OSB). .The .roof .deck .itself .is .considered .by .most .to .not .be .strong
.enough .to .fasten .a .solar .system .to, .so .the .connection .will .be .made .to .the .rafters. .Rafter
.roofs .have .the .rafters .on .a .sloped .roof .go .from .up .to .down. .Other .types .of .roofs .use
.purlins .instead .of .rafters .and .purlins .will .go .from .side .to .side .on .the .roof. .Most .metal .roofs
.are .purlin .roofs. .There .is .a .diode .called .a .blocking .diode, .which .prevents .reverse .current.
If .you .are .going .to .work .on .the .roof .to .fix .a .ground .fault .and .the .dc .disconnect .is .on .the
.ground .level, .which .of .the .following .is .the .best .safety .procedure? .- .correct
.answer.Lockout .Tagout
- .LOTO .(lockout .tagout) .is .a .system .of .turning .something .off .and .then .locking .it .in .the .off
.position, .so .that .nobody .comes .by .and .tries .to .turn .the .system .on .while .you .are .working
.on .it. .Fall .protection .should .also .be .used .in .this .situation, .since .the .troubleshooter .is .on
.the .roof.
If .an .inverter .indicates .that .there .has .been .a .ground .fault, .what .is .the .first .thing .that .a
.O&M .technician .should .do? .- .correct .answer.Open .all .the .disconnects .
- .The .best .thing .is .the .safest .thing .and .the .safest .thing .to .do .here .is .to .turn .everything .off.
.Turning .off .electrically .means .opening .disconnects. .If .we .do .something .that .leaves .the
.inverter .on, .that .is .not .safer. .If .we .replace .the .fuse, .that .does .not .take .care .of .the
.problem. .Often .times .a .fuse .is .replaced .and .the .system .may .work .for .a .while .until .there .is
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