Services
Makes a panel be a service
What is connection to a serving utility
When is a grounding bushing required by the NEC
When there are concentric knock outs
SSBJ
What is Supply Side Bonding Jumper
Max value of ground resistance
What is 25 ohms
EGC required for a 30 amp circuit
What is #10
Material that cannot be used as a grounding electrode
What is aluminum
NEC article covering the GEC
What is 250.66
Angle that a ground rod is permitted to be driven at
What is 45 deg
Size of EGC is determined by this
What is rating of overcurrent device
Most accurate method of measuring ground resistance
What is the three point fall of potential
GEC for a 4000-amp service
What is #3/0
Maximum length of external bonding conductor
What is 6'
NEC section covering separately derived systems
What is 250.30
Turns ratio of a 480 to 120/208, 3 phase transformer
What is 4 to 1
Minimum diameter of rod and pipe electrodes
What is 3/4"
Minimum diameter of a concrete encased rebar grounding electrode
What is 1/2"
Opposition to current flow is higher or low impedance
What is high impedance.
A generator connection to am ATS with an unswitched neutral connection is a separately derived system - T or F
What is false
Two main purposes of the grounded system conductor
What is to allow the utilization of the phase to neutral voltages and to return phase to ground fault current.
Connected to establish electrical continuity and conductivity
What is bonding
GEC size for a 600-amp Service
What is #2/0
Min. main bond jumper size for a 2500-amp switchboard
What is 400 kcmil
Transformer connection that provides 120/240v, 3ph, 4 wire system
What is a midpoint grounded delta
Line arcing, distance and impedance limits this type of current
What is short current current
Distance from the potential electrode to the electrode under test
What is 62% of the distance from the current electrode to the electrode under test