Electrical level 4 - Mod 1 - Load Calculations , Feeders and || || || || || || || || || || ||
Services Exam with verified answers || || || ||
All circuit conductors between the service equipment, the source of a separately derived
|| || || || || || || || || || || || ||
system, or other power supply source and the final branch-circuit overcurrent device. -
|| || || || || || || || || || || || ||
correct answer✔✔Feeder ||
The conductors and equipment for delivering electric energy from the serving utility to the
|| || || || || || || || || || || || || ||
wiring system of the premises served. - correct answer✔✔Service
|| || || || || || || ||
A conductor that has overcurrent protection ahead of its point of supply that exceeds the
|| || || || || || || || || || || || || || ||
value permitted for similar conductors that are protected. - correct answer✔✔Tap Conductors
|| || || || || || || || || || ||
The purpose of _____ _____ load calculations is to determine the size of these overcurrent
|| || || || || || || || || || || || || || ||
protection devices and the circuit conductors using NEC requirements. Typically supply
|| || || || || || || || || || ||
transformers, motor control centers, and subpanels. - correct answer✔✔Feeder Circuit
|| || || || || || || || ||
What NEC Article covers feeder circuits? It goes on to state that feeders shall have an
|| || || || || || || || || || || || || || || ||
ampacity that is not less than that required to supply the load. - correct answer✔✔NEC
|| || || || || || || || || || || || || || ||
Article 215 ||
The minimum ________________ shall have an allowable ampacity of not less than 100% of
|| || || || || || || || || || || || || ||
the non-continuous load plus 125% of the continuous load. - correct answer✔✔Feeder-
|| || || || || || || || || || ||
Circuit Conductor Size || ||
The factor for a CONTINUOUS load. - correct answer✔✔125% or a multiplier of 1.25
|| || || || || || || || || || || || ||
The factor for a NON-CONTINUOUS load. - correct answer✔✔100% or a multiplier of 1
|| || || || || || || || || || || || ||
, What are the three electrical calculation sections? (Not of the NEC) - correct
|| || || || || || || || || || || || ||
answer✔✔Branch Circuits, Feeders, and Services || || || ||
1.) Determine the load on branch circuits. 2.) Calculate the feeder load. 3.) Determine the
|| || || || || || || || || || || || || || ||
service load. - correct answer✔✔Sequence of Calculating Loads
|| || || || || || ||
After complying with the NEC, the conductors may have to be __________ to accomodate the
|| || || || || || || || || || || || || || ||
altered alloawable ampacity for that conductor. - correct answer✔✔Increased in Size (NEC
|| || || || || || || || || || || ||
SECTION 110.14c) ||
A continuous duty load is a load that operates without ANY interruption. - correct
|| || || || || || || || || || || || || ||
answer✔✔3 Hours or More || || ||
When derating, these can be used to quickly find a conductor to serve a load. Typically shown
|| || || || || || || || || || || || || || || || ||
on a calculator as 1/x. [Ex. 3 (1/x) = 1/3] - correct answer✔✔Reciprocals (multiplicative
|| || || || || || || || || || || || || ||
inverses)
The NEC recommends that "this" shouuld not exceed 3% to the farthest outlet, and 5% for the
|| || || || || || || || || || || || || || || || ||
combination of feeders and branch circuits to the farthest outlet. - correct answer✔✔Voltage
|| || || || || || || || || || || || ||
Drop for Feeders || ||
VD= 2xLxIxR / 1000 - correct answer✔✔Formula for Voltage Drop
|| || || || || || || || ||
What is used to represent the area of the conductor in "circular mils" of a voltage drop
|| || || || || || || || || || || || || || || || ||
formula? - correct answer✔✔CM || || ||
What letter is used to represent the constant of a voltage drop formula? - correct answer✔✔K
|| || || || || || || || || || || || || || ||
Services Exam with verified answers || || || ||
All circuit conductors between the service equipment, the source of a separately derived
|| || || || || || || || || || || || ||
system, or other power supply source and the final branch-circuit overcurrent device. -
|| || || || || || || || || || || || ||
correct answer✔✔Feeder ||
The conductors and equipment for delivering electric energy from the serving utility to the
|| || || || || || || || || || || || || ||
wiring system of the premises served. - correct answer✔✔Service
|| || || || || || || ||
A conductor that has overcurrent protection ahead of its point of supply that exceeds the
|| || || || || || || || || || || || || || ||
value permitted for similar conductors that are protected. - correct answer✔✔Tap Conductors
|| || || || || || || || || || ||
The purpose of _____ _____ load calculations is to determine the size of these overcurrent
|| || || || || || || || || || || || || || ||
protection devices and the circuit conductors using NEC requirements. Typically supply
|| || || || || || || || || || ||
transformers, motor control centers, and subpanels. - correct answer✔✔Feeder Circuit
|| || || || || || || || ||
What NEC Article covers feeder circuits? It goes on to state that feeders shall have an
|| || || || || || || || || || || || || || || ||
ampacity that is not less than that required to supply the load. - correct answer✔✔NEC
|| || || || || || || || || || || || || || ||
Article 215 ||
The minimum ________________ shall have an allowable ampacity of not less than 100% of
|| || || || || || || || || || || || || ||
the non-continuous load plus 125% of the continuous load. - correct answer✔✔Feeder-
|| || || || || || || || || || ||
Circuit Conductor Size || ||
The factor for a CONTINUOUS load. - correct answer✔✔125% or a multiplier of 1.25
|| || || || || || || || || || || || ||
The factor for a NON-CONTINUOUS load. - correct answer✔✔100% or a multiplier of 1
|| || || || || || || || || || || || ||
, What are the three electrical calculation sections? (Not of the NEC) - correct
|| || || || || || || || || || || || ||
answer✔✔Branch Circuits, Feeders, and Services || || || ||
1.) Determine the load on branch circuits. 2.) Calculate the feeder load. 3.) Determine the
|| || || || || || || || || || || || || || ||
service load. - correct answer✔✔Sequence of Calculating Loads
|| || || || || || ||
After complying with the NEC, the conductors may have to be __________ to accomodate the
|| || || || || || || || || || || || || || ||
altered alloawable ampacity for that conductor. - correct answer✔✔Increased in Size (NEC
|| || || || || || || || || || || ||
SECTION 110.14c) ||
A continuous duty load is a load that operates without ANY interruption. - correct
|| || || || || || || || || || || || || ||
answer✔✔3 Hours or More || || ||
When derating, these can be used to quickly find a conductor to serve a load. Typically shown
|| || || || || || || || || || || || || || || || ||
on a calculator as 1/x. [Ex. 3 (1/x) = 1/3] - correct answer✔✔Reciprocals (multiplicative
|| || || || || || || || || || || || || ||
inverses)
The NEC recommends that "this" shouuld not exceed 3% to the farthest outlet, and 5% for the
|| || || || || || || || || || || || || || || || ||
combination of feeders and branch circuits to the farthest outlet. - correct answer✔✔Voltage
|| || || || || || || || || || || || ||
Drop for Feeders || ||
VD= 2xLxIxR / 1000 - correct answer✔✔Formula for Voltage Drop
|| || || || || || || || ||
What is used to represent the area of the conductor in "circular mils" of a voltage drop
|| || || || || || || || || || || || || || || || ||
formula? - correct answer✔✔CM || || ||
What letter is used to represent the constant of a voltage drop formula? - correct answer✔✔K
|| || || || || || || || || || || || || || ||
