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construction seminars > Untitled Deck > Flashcards

Untitled Deck Flashcards

1
Q

What shall nonshielded conductors over 750V be?

A

Grounded

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2
Q

What is the minimum distance allowed between switchgear and an outdoor oil storage tank?

A

10 ft

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3
Q

What is the minimum vertical separation on a pole between the supply cable and the lowest communication attachment?

A

16 inches

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4
Q

What is the vertical clearance for insulated communication conductors above or crossing railroad tracks?

A

23.5 feet

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5
Q

What is the minimum clearance for non-insulated communication conductors over pedestrian walkways?

A

12 feet

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6
Q

What is the minimum clearance of open supply conductors over 750V to 22KV crossing over bridges?

A

5.5 feet

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7
Q

What is the minimum vertical clearance between ordinary supply conductors over 8.7 kV and communication conductors?

A

40 plus .4 per kV over 8.7 kV inches

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8
Q

What should backfill within 6” of conduit be free of?

A

Solid material greater than 4” maximum dimension

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9
Q

How high should horizontal runs of supply cables be supported above the floor in underground structures?

A

At least 3 inches

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construction seminars (7 decks)

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