Overcurrent protection - Study guides, Class notes & Summaries

In general, transformer secondary conductors are not considered to be protected by the primary overcurrent protective device. TRUE 240.4(F) An installation consists of a 10-kVA, single-phase transformer with a 440-volt primary and a 110-volt, 2-wire secondary using THWN copper conductors. No secondary OCPD is installed. The secondary loads are considered to be noncontinuous loads. Calculate the minimum size secondary conductors required to handle the secondary full-load current for this transf...

If two 10-ohm resistors are connected in series, what is the total resistance of these resistors? - ANSWER20 ohms In a split-phase motor, how much greater is the starting current when compared to the full-load current? - ANSWER6 to 8 times The terminals of a motor can be identified using a battery and a ___ - ANSWERvoltmeter A 5-ohm and a 20-ohm resistor are connected in parallel. What is the total resistance of these two resistors? - ANSWER4 ohms The normal location to provide overcurrent p...

Where conduits enter a floor-standing switchboard or panelboard at the bottom, the conduits including their end fittings, shall not rise more than _____ above the bottom of the enclosure. a) 6 inches b) 4 inches c) 2 inches d) 3 inches - ANSWERD: 3 inches Ref: 408.5 When installed on the service of a building or structure, a type 2 SPD (TVSS) shall be connected _____. a)on the line side of the service disconnect overcurrent device b) on the load side of the service disconnect overc...

IEC 4th Year Final Questions And Answers 100% Guaranteed Success. Duty on escalator and moving walk driving machine motors shall be rated as ___. Select one: a. continuous b. intermittent c. varying d. periodic e. short-time - correct answer. a. continuous Each carnival ride and concession shall be provided with a fused disconnect switch located within sight of and within ___ feet of the operator's station. Select one: a. 8 b. 10 c. 6 d. 25 e. 50 - correct answer....

A live wire is sometimes called a(n) __________. grounded conductor ungrounded conductor grounding conductor CORRECT ANSWER ungrounded conductor Branch circuit conductors are the ____________. wires to the outlets receptacle wires without insulation amp suppliers CORRECT ANSWER wires to the outlets For a 14-gauge copper wire, the maximum overcurrent protection rating is _____ amps. 30 15 20 CORRECT ANSWER 15 The following item is safe to insert into an electrical...

Which tool is most approprite to clean battery connections? A. B. C. D. - ANSWER The minimum amp circuit breaker that should be used to protect 120V water heater circuit with a 1600-watt element would be rated at _________ amps. A. 15 B. 10 C. 20 D. 30 - ANSWER A. 15 When testing for excessive EMF emissions near a conductor or appliance, the tool of choice is a(an): A. Ohmmeter B. DVOM C. Gauss meter D. infrared sensor - ANSWER C. Gauss meter The primary problem with using a series circuit to su...

A grounding electrode system is generally required for each building or structure served by a feeder - Answer-true Where a building or structure is supplied by an ungrounded system, the feeder from the ungrounded system must include an equipment grounding condcutor or supply-side bonding jumper with the conductors to the building disconnecting means, and it must be connected to the disconnecting means enclosure as well as the grounding electrode conductor - Answer-true NEC ____ provides th...

A(n) _______ is the circuit conductors between the final overcurrent device and the outlets. open circuit branch circuit feeder circuit service conductor correct answers branch circuit The circuit conductors between the service equipment and the final branch circuit overcurrent protection device is a(n) open circuit branch circuit feeder circuit service conductor correct answers feeder circuit When doing service entrance calculations, 1 volt-ampere equals 1 joule 1 watt 1 ohm 1...

A(n) _______ is the circuit conductors between the final overcurrent device and the outlets. open circuit branch circuit feeder circuit service conductor - Answer-branch circuit The circuit conductors between the service equipment and the final branch circuit overcurrent protection device is a(n) open circuit branch circuit feeder circuit service conductor - Answer-feeder circuit When doing service entrance calculations, 1 volt-ampere equals 1 joule 1 watt 1 ohm 1 mil - Answer-1 w...

Journeyman Electrician #4 Exam Questions and Answers Where conduits enter a floor-standing switchboard or panelboard at the bottom, the conduits including their end fittings, shall not rise more than _____ above the bottom of the enclosure. a) 6 inches b) 4 inches c) 2 inches d) 3 inches -Answer-D: 3 inches Ref: 408.5 When installed on the service of a building or structure, a type 2 SPD (TVSS) shall be connected _____. a)on the line side of the service disconnect overcurrent device ...