Question 1 of 10
What is a Separately Derived System (SDS)?
An SDS is defined by its lack of direct electrical connection to the primary power source.
Question 2 of 10
What is the primary function of the System Bonding Jumper (SBJ)?
The SBJ creates a low-impedance path to allow overcurrent devices to quickly clear ground faults.
Question 3 of 10
How many System Bonding Jumpers (SBJs) are permitted in an SDS?
Only one SBJ is allowed to prevent objectionable neutral current flow.
Question 4 of 10
Where does the Grounding Electrode Conductor (GEC) originate?
The GEC must originate at the same point on the SDS where the SBJ is connected.
Question 5 of 10
What is the purpose of the Equipment Bonding Jumper (EBJ)?
The EBJ bonds the metal parts of the SDS to the neutral conductor at the disconnecting means.
Question 6 of 10
How is the Equipment Bonding Jumper (EBJ) sized?
The EBJ is sized according to NEC Table 250.66, which is based on the secondary conductors.
Question 7 of 10
What is a common grounding electrode allowed for multiple SDSs?
A common GEC for multiple SDSs must be sized no smaller than 3/0 AWG copper.
Question 8 of 10
Which of the following is NOT an acceptable grounding electrode?
Metal water pipes, structural steel, and concrete-encased electrodes are all acceptable per NEC; non-metallic pipes are not.
Question 9 of 10
What is the minimum length requirement for a ground ring?
A ground ring must consist of at least 20 feet of bare copper conductor.
Question 10 of 10
What must be bonded to the neutral conductor in the area served by the SDS?
Structural steel and metal piping must be bonded to the neutral conductor to eliminate voltage differences during a fault.
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