Master Electrician Study guides, Class notes & Summaries

Type ____ is multiconductor cable identified for use as underground service entrance cable. correct answer: Type USE cable Knife switch rated for more than 1200 Amps at 250Volts or less correct answer: Can be used only as isolating switch, shall not be opened under load Track lighting with outlets in a bathroom is not allowed because ? correct answer: Track lighting has receptacle Where internal combustion engines are used as the prime motor, an on site fuel supply shall be provided ...

There are six conductors in a race way connected to 75° C rated circuit breaker. Each wire has a 70 amp load using THHM conductors. The minimum size conductors used our #_________AWG correct answer: 4 Thermal insulation shall not be installed within _________inches of recessed lighting fixtures correct answer: 3 A 1 inch conduit contains three wire circuits or a phase system. All conductors are number 10 TW. Each circuit consist of two phase conductors and one grounding conductor and on...

MASTER ELECTRICIAN TEST 211 With Verified Solutions Graded A+ Given: Two separate Services are identical in voltage and amperage, except that one service serves only motor - loads and the other serves lighting loads only. in the event of a short circuit in these services, the available short circuit current will be: A) The same in either service B) Higher in the motor-load service C) Higher in the lighting -load service D) 25% greater in the service for the motor load - The same in eithe...

QUESTIONS AND ANSWERS

QUESTIONS AND ANSWERS

In a farm building where livestock is housed and an equipotential plane system is required because wire mesh or other conductive elements are embedded or placed under concrete and bonded to metal structures that could become energized, the equipotential plane is necessary to minimize _____ differences within the plane. - ANSWER-voltage When exceptions are not to be considered, the MINIMUM voltage allowed at the line terminals of a 480-volt, three-phase, fire pump controller under motor starti...

A 150 kVA service transformer has a 480Y/277 volt 3-phase primary and a 208Y/120 volt, 3-phase secondary. What is the approximate full-load ampere rating of the primary of the transformer? - ANSWER-180 amperes Where a conductor is marked RHW-2 on the insulation what does the "-2" represent? - ANSWER-The conductor has a maximum operating temperate of 90 degrees C. For a grounded electrical system supplied by a feeder or branch circuit, the equipment grounding conductor shall be sized in a...

According to the National Electrical Code, the minimum size TW copper conductor for a 5 HP, 3 phase, 230 volt, squirrel cage motor started at full voltage shall not be less than # ___ AWG. - ANSWER-14 How many AWG #12 THHN conductors are allowed in a 1" RMC nipple? - ANSWER-35 wires How many AWG #12 THHN conductors are allowed in a 1" RMC? - ANSWER-26 #12 THHN conductors The circular mil area of a #18 AWG would be ___ CMILS for solid or stranded. - ANSWER-1620 According to Ta...

Given: Two separate Services are identical in voltage and amperage, except that one service serves only motor - loads and the other serves lighting loads only. in the event of a short circuit in these services, the available short circuit current will be: A) The same in either service B) Higher in the motor-load service C) Higher in the lighting -load service D) 25% greater in the service for the motor load - ANSWER-The same in either service (general knowledge) A device...

branch circuit - ANSWER-That portion of a wiring system extending beyond the final overcurrent device is called the: Calculated load - ANSWER-The final sum of the computed loads, based on the minimum code requirements, is the Resistance - ANSWER-As compared to #10, a #8 wire of the same Iength has less: 0.001 inch - ANSWER-One circular mil is the area of a circle whose diameter is: 1,000,000 CM - ANSWER-6. A round bus-bar one inch in diameter, has a circular mil area of: four time...

The ordinary direct current series motor does not operate satisfactorily with alternating current. One of the main reasons for this is a. excessive heating due to eddy currents in the solid parts of the field structure b. that the armature current and field current are out of phase with each other c. that the field flux lags 120 in time phase with respect to the line voltage d. excessive heating due to the low voltage drop in the series field - ANSWER-a. excessive heating due to eddy curr...

In a farm building where livestock is housed and an equipotential plane system is required because wire mesh or other conductive elements are embedded or placed under concrete and bonded to metal structures that could become energized, the equipotential plane is necessary to minimize _____ differences within the plane. - ANSWER-voltage When exceptions are not to be considered, the MINIMUM voltage allowed at the line terminals of a 480-volt, three-phase, fire pump controller under motor starti...