Exam (elaborations)
IEC YEAR 1 FINAL EXA1
- Course
- Institution
IEC YEAR 1 FINAL EXA1
[Show more]
Content preview
IEC YEAR 2 FINAL EXAMAnex _____ in the NEC contains examples of load calculations for dwellings. -
ANSWER D
Which of the installations listed below would be a wet location?
-a receptacle installed on the exterior wall of a building
- a run of PVC conduit installed on a fishing pier
-a luminaire installed on a parking lot pole - ANSWER all of these
Which of the following is an example of a bare conductor?
- a 12 awg THHN copper wire
- the bare ground wire contained within romex (NM cable) sheathing
-the bare aluminum wire twisted with triplex - ANSWER the bare aluminum wire
twisted with triplex
Which of the following statements is TRUE for an individual (or dedicated) branch
circuit that is run in a conduit with other circuits? - ANSWER it can share a neutral
with another circuit
Equipment designed to open circuits under ____ shall have an interrupting rating not
less than the nominal circuit voltage and the current that is available at the line side
of the equipment.
- short circuit
-overload
-ground fault - ANSWER all of these
The NEC permits the insulation for an ungrounded conductor to be _____ in color.
- orange
-black
-brown
-yellow - ANSWER any of these
Which of the following locations requires that a three-way switch be installed at the
lower landing and another three-way switch be installed at the upper landing to
control the stair way lighting between the 1st and 2nd floors? - ANSWER a
townhome
A 175- amp breaker protects a feeder that originates in a 277/480-volt, 3-ph, 4 wire
service panel in an office building. Which of the following conductors is the smallest
size permitted for the feeder ? - ANSWER 2/0
A 200-amp breaker protects a feeder that originates in a 120/240 volt, 3 ph, 4 wire
service panel in a movie theatre. Which of the following THHN/THWN conductors is
the smallest size permitted for the feeder ? - ANSWER 3/0
The maximum number of 3-pole circuit breakers used as service disconnects
permitted in a 3 phase panelboard is ______. - ANSWER 6
, Which of the following are characteristics of THHN/THWN insulation?
- heat-resistant
- a nylon outer covering or some equivalent
- flame retardant
-moisture-resistant - ANSWER all of these
For the purpose of determining the number of current-carrying conductors in a cable
or conduit, the neutral _____ counted when the branch circuit is 120/240-volt, 1
phase, 3 wire connected to a 120/240-volt, 3 phase delta, 4 wire panelboard. Each of
the two circuits carries 16 amps and serves resistive (linear) loads. - ANSWER is
not
Where a 120/240 volt, 1 phase, 3 wire multiwire branch circuit is connected to a
"split-wired" duplex receptacle in a barber shop, the branch-circuit OCPD/disconnect
is permitted to be ______
i. two single-pole circuit breakers without handle ties
ii. two single-pole circuit breakers with identified handle ties
iii. a 2-pole circuit breaker - ANSWER ii or iii only
Which of the following is a type of circuit condition?
i.short circuit
ii. overload - ANSWER i and ii
A 20-amp multiwire branch circuit is connected to breakers 1 and 3 in a 120/208 volt
3 phase 4 wire panelboard. _____ if the "hot" from breaker 3 and the neutral are
connected to a 2000-watt lighting fixture load. - ANSWER The load will operate
normally and the breaker will not trip
When ____ touch together this is a short circuit.
-i. two ungrounded circuit conductors
- ii.an ungrounded and a grounded circuit conductor
- iii. an ungrounded circuit conductor and the metal conduit. - ANSWER i or ii only
You are going to pull in three dedicated (individual) branch circuits into one conduit.
Each circuit supplies power to a 120-volt load. The ungrounded conductors will be
connected to breakers 2,4 and 6 in a 120/240 volt single phase 3- wire panel board.
Per the NEC, the fewest number of neutral conductors you can install for the branch
circuit is _______. - ANSWER 2
In a run of conduit, when couplings and connectors are loose this will ____ the
amount of time required for a circuit breaker to open when an overload occurs. -
ANSWER have no effect on
Your only available grounding electrode is the metal underground water pipe from
the water utility. You are required by the NEC to have one other grounding electrode
for your service. Which of the following driven electrodes could you use ? - ANSWER
10 ft of trade size 1 rigid metal conduit
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller leonardmuriithi061. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $17.99. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
80189 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now