Monday, May 13, 2013

NEC Test Quesions - Overhead Service Conductors

1. Minimum vertical clearance required to provide for 600V supply at the electrical service entrance of the building is:
a) 12 ft
b) 16 ft
c) 16 ft
d) 18 ft


2. Service mast is provided with Braces or Guys for providing adequate strength for supporting service drop conductors:
a) True
b) False


3. Pumps and emergency systems can be supplied with additional number of services:
a) True
b) False


4.Additional services shall be permitted to the buildings or structures where the capacity requirements are in excess of 1000 amperes at the supply voltage of 600 V or less:
a) True
b) False


5. Ground conductors and service conductors shall be installed in the same raceway or service cable:
a) True
b) False


6. Service conductors installed as open conductors or multi-conductor cables without any overall jacket shall have a clearance not less than __ from windows, doors, balconies, ladders or stairs:
a) 2.5 ft
b) 3 ft
c) 4 ft
d) 6 ft


7. Overhead conductors shall not be installed beneath the openings of the buildings from where material can be removed:
a) True
b) False


8. Dried tree branches can be used as supporting structures for the over head service conductors:
a) True
b) False


9. The minimum vertical clearance ____ is required to be permitted for over head service conductors over public streets, alleys, roads and parking areas:
a) 12 ft
b) 14 ft
c) 16 ft
d) 18 ft