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
WHAT FUSE RATING SHALL BE USED IN A SUPERVISED LOCATION FOR PRIMARY PROTECTION?
What is 250%
100
AB AREA INCLUDING A BASIN WITH A TOILET OR SHOWER IS?
What is BATHROOM
200
The windings of a 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 SECTIONS IS USED TO KNOW THE NEXT SIZE OCPD?
What is SECTION 240.6 (A)
200
WHAT IS THE OVER CURRENT PROTECT DEVICE IF CALCULATIONS EQUAL 50.5 AMPS?
What 60 AMPS
200
HOW MANY #12THHN CAN YOU FIT IN A 3/4" EMT CONDUIT? USE ANNEX C IN BACK OF CODE BOOK
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 article COVERS MOTORS
What is Article 450
300
WHAT IS 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 Induction
400
THE UNGROUNDED PHASE TO PHASE VOLTAGE FOR A WYE CONNECTED TRANSFORMER IS THE SAME, BUT THE COIL VOLTAGE IS EQUAL TO WHAT?
What is THE SQUARE ROOT OF 3
400
what is the ratio of a 4,160 to 277/480 VOLTS
What is 8.6 TO 1
400
A TRANSFORMER NOT OVER 112 1/2 KVA SHALL BE HOW FAR AWAY FROM COMBUSTIBLE MATERIALS?
What is 12 INCHES
400
WHAT IS THE PRIMARY AND SECONDARY PROTECTION FUSE RATING OF A SUPERVISED 200 KVA TRANSFORMER 4,160 VOLTS TO 208 VOLTS 3 PHASE WITH A 9.9% IMPEDANCE?
What is 90 AMP FUSE FOR PRIMARY AND 1600 AMP FUSE FOR SECONDARY
400
WHAT SECTION IN THE CODE BOOK TALKS ABOUT SECONDARY TIES?
What is 450.6
500
IF THE VOLTAGE IN A TRANSFORMER IS INCREASED THE AMPERAGE WILL
What is DECREASE
500
WHAT IS THE FORMULA FOR CALCULATING 3 PHASE TRANSFORMERS
What is KVAX1000/EX1.73XPF
500
WHAT IS THE HIGHEST KVA TRANSFORMER 1000 VOLTS OR LESS YOU CAN INSTALL ABOVE A CEILING?
What is 50 KVA
500
TRANSFORMERS RATED OVER WHAT VOLTAGE SHALL BE INSTALLED IN A VAULT?
What is 35,000VOLTS
500
WHAT ARTICLE COVERS GENERATORS?
What is 445
M
e
n
u