Grounding and Bonding
NEC table used to size an equipment grounding conductor
What is table 250.122
The ampere rating of a circuit breaker is located here
What is the handle of the device
Name the type of fuse shown * Show Fuse*
What is Edison-based
Name two of the three basic types of three-phase motors
What is squirrel-cage induction, wound-rotor induction, synchronous motor
Where the midpoint of one phase winding is grounded on a 4-wire delta-connected system the higher phase voltage to ground shall be durably and permanently marked by this color ____
What is orange
110.15
The continuity between service equipment and enclosures is maintained by _____
What is bonding
What is class A
Name any two of the five markings that are required to be attached on a cartridge type fuse
What is Ampere rating, voltage rating, interrupting rating, current limiting, name or trade mark
When connecting a Wye OR Delta motor in a high-voltage application, the motor windings would be connected in _____
What is series
The FLC for a polyphase 50Hp synchronous-type motor operating at 480v
What is 52amps
T430.250
When connected to a rod, pipe, or plate electrode, the minimum size grounding electrode conductor required for a 320amp residential service is
What is #6 AWG
Name one of the two organizations that test and list overcurrent devices as safe to use
What is UL or CSA (Canadian Standards Association)
The term _____ is used when determining the time-current relationship among overcurrent protective devices connected in series
What is coordination
Name two methods used to determine the rotating direction of a three-phase motor
What is bump the motor, phase rotation meter
Conduit or tubing not exceeding ____ in length can be filled to ____ % of their total cross-sectional area
What is 24" and 60%
Chapter 9 table 1 note #4
Name one of the three types of bonding jumpers that are permitted by the code
What is Wire, bus, screw
Frame size for molded-case circuit breakers are identified by the _____ ampere rating available
What is largest
Single-element fuses respond quickly to this type of circuit
What is short circuit
The difference between the speed of the rotating magnetic field and the actual rotor speed in an induction type motor is called ____
What is slip
Isolated power systems (often used in health care facilities) shall have circuit conductors identified by
What is orange and brown with distinctive strip other than white, green, or gray
The minimum size wire type bonding jumper required for a 3000A service fed with 10 parallel runs of 350kCIML
What is 500kCMIL
Table 250.102(C)(1) Note #1
350,000 X 10 = 3,5000,000 x .125= 437,500 round up to 500 kCMIL
In residential applications, the available fault current is rarely higher than _____
What is 10,000 Amps
When sizing fuses for a given application, having a _____ of the system is essential
What is schematic
What is the electrical equivalent in watts of 1 horsepower of mechanical energy
Where the rating from table 430.52(C)(1) is not sufficient for starting current of a motor, an inverse time circuit breaker can be increased to a maximum of ____ % of the FLC when _____ amperes or less.
What is 400% and 100amps
430.52(C)(1)(3)