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Transformer Theory
Transformer Formula
Electrical Code
OVERCURRENT PROTECTION
Random
100
The amperage of a single phase transformer is found by dividing the KVA rating of transformer by the primary or what voltage
What is secondary voltage
100
what formula is used for single phase transformers Fault current
What is FLA/IMPEDANCE
100
WHAT TABLE IN THE 2014 ELECTRICAL CODE BOOK IS USED FOR TRANSFORMER OCPD OVER 1000 VOLTS
What is TABLE 450.3 (A)
100
This is the NEC Article that covers "Over-current Protection"
What is Article 240
100
DEFINED AS AN AREA INCLUDING A BASIN WITH A TOILET AND/OR SHOWER IS?
What is BATHROOM?
200
The windings of a open-delta connected system only pull what percentage of the line current
What is 58%
200
WHAT IS THE SQUARE ROOT OF 3
What is 1.732
200
WHAT NEC ARTICLE IS USED TO KNOW THE NEXT SIZE OCPD?
What is SECTION 240.6 (A)
200
This type of fuse is used when a high in-rush current is expected at start-up.
What is a "dual-element time-delay fuse?
200
HOW MANY #12THHN CAN YOU FIT IN A 3/4" EMT CONDUIT?
What is 16
300
How many volts across phase to phase in a 277/480 VOLT system
What is 480 volts
300
What IS 480 DIVIDED BY 277
What is 1.732
300
what NEC article COVERS MOTORS
What is Article 430
300
AT CURRENTS GREATER THAN 9 AMPS,THE PRIMARY OCPD FOR A 30 KVA TRANSFORMER 480 VOLTS 3 PHASE?
What is A 50 AMP OCPD
300
the transfer of electrical energy from one circuit to another without the aid of electric connections is known as?
What is Mutual Induction?
400
This transformer configuration produces these secondary voltages phase to ground, 120, 120, 208.
What is a "Delta".
400
what is the ratio of a 7200 to 240/120 VOLTS
What is 30:1?
400
This NEC Article covers work space about equipment.
What is Article 110
400
IS THE MAXIMUM NUMBER OF SERVICE DISCONNECTS GROUPED TOGETHER WITHOUT REQUIRING A "MAIN" DISCONNECT
What is 6?
400
THIS SECTION IN THE CODE BOOK TALKS ABOUT SWIMMING POOLS?
What is ARTICLE 680?
500
If the transformer voltage is increased the current will do this.
What is DECREASE
500
Assuming a pf of 1.0, a 10kVA transformer will service a load of _____amps @ 240V
What is 42 Amps?
500
this NEC Article covers "Capacitors"
What is NEC Article 460?
500
TRANSFORMERS RATED OVER WHAT VOLTAGE SHALL BE INSTALLED IN A VAULT?
What is 35,000VOLTS
500
THIS ARTICLE COVERS GENERATORS?
What is ARTICLE 445?