Army Electrical Explosives Safety
(Ammo-28) With 100% Correct Answers
Which |two |publications |provide |detailed |information |on |lightning |protection |systems? |-
|Correct |Answer- |DA |PAM |385-64
NFPA |780
Which |statements |about |lightning |protection |are |true?Select |all |that |apply. |- |Correct
|Answer- |Lightning |can |detonate |munitions |and |explosives.
Lightning |seeks |the |path |of |least |resistance |to |ground.
Lightning |cannot |be |stopped |or |prevented.
Which |statement |is |true |about |a |mast |LPS? |- |Correct |Answer- |Each |mast |must |have |two
|paths |to |ground.
A |30-foot |tall |building |is |protected |by |a |catenary |system. |How |far |from |the |building |should
|the |masts |be |placed? |- |Correct |Answer- |at |least |6 |feet
Which |LPS |uses |air |terminals |and |conductors |mounted |directly |to |the |structure? |- |Correct
|Answer- |Integral
Why |does |the |wooden |mast |have |an |air |terminal |on |top |and |two |down |conductors |running
|its |entire |length? |- |Correct |Answer- |The |wooden |mast |is |not |electrically |conductive
Which |of |the |following |is |NOT |a |requirement |for |air |terminals? |- |Correct |Answer- |Air
|Terminals |must |be |at |least |6 |feet |tall.
During |the |inspection, |John's |team |logged |a |discrepancy |for |this |air |terminal. |Why? |-
|Correct |Answer- |The |air |terminal |is |not |attached |to |a |conductor.
How |many |down |conductors |are |required |for |a |building |with |a |perimeter |length |of |325
|feet? |- |Correct |Answer- |4
While |conducting |an |LPS |inspection, |you |see |mast |down |conductors |routed |as |shown |in
|the |image |below. |Do |you |write |it |up |as |a |discrepancy? |Why |or |why |not? |- |Correct |Answer-
|Yes, |because |mast |down |conductors |should |be |180 |degrees |apart.
A |steel |beam, |connected |to |the |main |LPS |at |its |upper |and |lower |extremities, |is |used |as |a
|down |conductor. |At |what |intervals |should |it |be |connected |to |the |grounding |system? |-
|Correct |Answer- |60 |feet |or |less
, Which |statement |about |grounding |systems |is |true? |- |Correct |Answer- |The |resistance
|should |be |25 |ohms |or |less.
Which |of |the |following |statements |regarding |bonding |are |true? |Select |all |that |apply. |-
|Correct |Answer- |Bonding |reduces |the |threat |of |sideflash |by |providing |a |low |impedance
|path |to |ground.
Bonding |is |a |way |of |connecting |LPS |conductors |to |grounded |metal |objects.
When |should |a |grounded |metal |object |be |considered |for |bonding? |- |Correct |Answer-
|When |it's |within |6 |feet |of |a |conductor
Which |bonding |method |is |the |most |permanent |and |secure? |- |Correct |Answer- |Exothermic
|weld
Which |factors |are |used |to |calculate |bonding |distance?Select |all |that |apply. |- |Correct
|Answer- |Height |of |proposed |bond
Flashover |medium
Number |of |down |conductors
While |conducting |the |inspection, |John's |team |noticed |a |new |metal |light |pole |installed |3
|feet |from |the |down |conductor |at |the |corner |of |this |building. |They |logged |a |discrepancy.
|Why? |- |Correct |Answer- |Because |grounded |metal |objects |within |6 |feet |of |LPS |conductors
|should |be |bonded |to |it
Which |types |of |information |does |an |LPS |record |provide? |Select |all |that |apply. |- |Correct
|Answer- |Test |locations
Test |item |descriptions |or |listing
Type |of |test
Responsibilities |for |conducting |and |administering |the |test |plan
Which |section |of |DA |PAM |385-64 |provides |LPS |visual |inspection |guidance? |- |Correct
|Answer- |Appendix |D
How |often |is |a |visual |inspection |required |on |an |LPS? |- |Correct |Answer- |Every |12 |months
While |conducting |the |LPS |inspection, |the |team |saw |these |surveillance |cameras. |Does
|this |building |comply |with |LPS |standards? |- |Correct |Answer- |No, |because |the |surveillance
|cameras |are |outside |the |zone |of |protection.
How |long |must |LPS |test |results |be |kept |on |file? |- |Correct |Answer- |6 |inspection |cycles
(Ammo-28) With 100% Correct Answers
Which |two |publications |provide |detailed |information |on |lightning |protection |systems? |-
|Correct |Answer- |DA |PAM |385-64
NFPA |780
Which |statements |about |lightning |protection |are |true?Select |all |that |apply. |- |Correct
|Answer- |Lightning |can |detonate |munitions |and |explosives.
Lightning |seeks |the |path |of |least |resistance |to |ground.
Lightning |cannot |be |stopped |or |prevented.
Which |statement |is |true |about |a |mast |LPS? |- |Correct |Answer- |Each |mast |must |have |two
|paths |to |ground.
A |30-foot |tall |building |is |protected |by |a |catenary |system. |How |far |from |the |building |should
|the |masts |be |placed? |- |Correct |Answer- |at |least |6 |feet
Which |LPS |uses |air |terminals |and |conductors |mounted |directly |to |the |structure? |- |Correct
|Answer- |Integral
Why |does |the |wooden |mast |have |an |air |terminal |on |top |and |two |down |conductors |running
|its |entire |length? |- |Correct |Answer- |The |wooden |mast |is |not |electrically |conductive
Which |of |the |following |is |NOT |a |requirement |for |air |terminals? |- |Correct |Answer- |Air
|Terminals |must |be |at |least |6 |feet |tall.
During |the |inspection, |John's |team |logged |a |discrepancy |for |this |air |terminal. |Why? |-
|Correct |Answer- |The |air |terminal |is |not |attached |to |a |conductor.
How |many |down |conductors |are |required |for |a |building |with |a |perimeter |length |of |325
|feet? |- |Correct |Answer- |4
While |conducting |an |LPS |inspection, |you |see |mast |down |conductors |routed |as |shown |in
|the |image |below. |Do |you |write |it |up |as |a |discrepancy? |Why |or |why |not? |- |Correct |Answer-
|Yes, |because |mast |down |conductors |should |be |180 |degrees |apart.
A |steel |beam, |connected |to |the |main |LPS |at |its |upper |and |lower |extremities, |is |used |as |a
|down |conductor. |At |what |intervals |should |it |be |connected |to |the |grounding |system? |-
|Correct |Answer- |60 |feet |or |less
, Which |statement |about |grounding |systems |is |true? |- |Correct |Answer- |The |resistance
|should |be |25 |ohms |or |less.
Which |of |the |following |statements |regarding |bonding |are |true? |Select |all |that |apply. |-
|Correct |Answer- |Bonding |reduces |the |threat |of |sideflash |by |providing |a |low |impedance
|path |to |ground.
Bonding |is |a |way |of |connecting |LPS |conductors |to |grounded |metal |objects.
When |should |a |grounded |metal |object |be |considered |for |bonding? |- |Correct |Answer-
|When |it's |within |6 |feet |of |a |conductor
Which |bonding |method |is |the |most |permanent |and |secure? |- |Correct |Answer- |Exothermic
|weld
Which |factors |are |used |to |calculate |bonding |distance?Select |all |that |apply. |- |Correct
|Answer- |Height |of |proposed |bond
Flashover |medium
Number |of |down |conductors
While |conducting |the |inspection, |John's |team |noticed |a |new |metal |light |pole |installed |3
|feet |from |the |down |conductor |at |the |corner |of |this |building. |They |logged |a |discrepancy.
|Why? |- |Correct |Answer- |Because |grounded |metal |objects |within |6 |feet |of |LPS |conductors
|should |be |bonded |to |it
Which |types |of |information |does |an |LPS |record |provide? |Select |all |that |apply. |- |Correct
|Answer- |Test |locations
Test |item |descriptions |or |listing
Type |of |test
Responsibilities |for |conducting |and |administering |the |test |plan
Which |section |of |DA |PAM |385-64 |provides |LPS |visual |inspection |guidance? |- |Correct
|Answer- |Appendix |D
How |often |is |a |visual |inspection |required |on |an |LPS? |- |Correct |Answer- |Every |12 |months
While |conducting |the |LPS |inspection, |the |team |saw |these |surveillance |cameras. |Does
|this |building |comply |with |LPS |standards? |- |Correct |Answer- |No, |because |the |surveillance
|cameras |are |outside |the |zone |of |protection.
How |long |must |LPS |test |results |be |kept |on |file? |- |Correct |Answer- |6 |inspection |cycles
