Question 1
You are installing a metal junction box in a drywall ceiling. The cable entering is nonmetallic-sheathed cable. What must you ensure regarding bonding?
Question 2
An apprentice is terminating a shielded instrumentation cable. What is the common practice for the shield connection at the field device end in order to reduce noise loops?
Question 3
A 600/120 V single-phase transformer is used to supply a 120 V control circuit from a 600 V feeder. Which conductors must be bonded and grounded on the secondary side?
Question 4
In a typical 120/240 V single-phase residential installation in Canada, which conductor colour is reserved for the equipment bonding (grounding) conductor?
Question 5
Which calculation determines the size of the grounding electrode conductor?
Question 6
Which electrode must be spaced at least 2 meters from a rod electrode?
Question 7
How is the grounding electrode conductor sized?
Question 8
According to the CEC, what is the minimum size of a copper 'grounding conductor' for a service supplied by 3/0 AWG copper conductors?
Question 9
According to CEC Rule 10-102 (Electrode system) concepts, if multiple electrodes (such as a ground rod and a metal water pipe) are used, how must they be connected?
Question 10
Which of the following describes the correct orientation of a 'grounding electrode conductor' at the service entrance?
Question 11
Under CEC Section 10 rules, what is the minimum size of a copper grounding conductor for a service supplied by 3/0 AWG copper ungrounded conductors?
Question 12
During a service upgrade, you are asked whether the existing grounding electrode system for a 120/240 V single-phase dwelling service is adequate. The system currently uses a metal underground water pipe bonded within the required distance of entry. Under what situation would an additional grounding electrode typically be required?
Question 13
A feeder supplies a subpanel in a detached garage. In a modern Canadian installation, how are the neutral and equipment bonding conductors handled at the subpanel?
Question 14
A grounding electrode system includes building steel and a metal underground water pipe. Which practice best ensures a reliable grounding electrode system?
Question 15
On a set of drawings, the riser diagram shows a grounding electrode conductor from the service equipment to building steel and to a water pipe. What is the main purpose of this conductor?
Question 16
A Master electrician is planning the grounding electrode system for a new service. In addition to a metal underground water pipe, what other electrode is commonly installed to comply with grounding electrode requirements?
Question 17
A 120/240 V, single-phase dwelling service has a metal underground water piping system and a concrete-encased electrode present. What is generally required for the grounding electrode system?
Question 18
A detached garage is supplied by a feeder from the dwelling. Under many US codes, what is one key grounding requirement for the garage?
Question 19
A service to a small commercial building uses a metal underground water pipe and a driven ground rod as grounding electrodes. Under typical US code practice, how should these electrodes be treated?
Question 20
What is the primary function of the main bonding jumper (MBJ) in a service entrance equipment?
Question 21
What is the primary function of a ground rod (grounding electrode) in a residential service installation?
Question 22
Which of the following is NOT an acceptable method for securing a grounding electrode conductor (GEC) to an electrode?
Question 23
In a $120/240 \text{ V}$ single-phase, three-wire service, what is the voltage measured between the neutral and the equipment grounding conductor (EGC) under normal, balanced load conditions?
Question 24
When installing multiple ground rods, what is the minimum required spacing between them?
Question 25
What is the standard minimum length for a driven ground rod?
Question 26
What is the primary requirement for a 'Concrete-Encased Electrode' (Ufer Ground)?
Question 27
What is the minimum size for a Ground Ring electrode conductor?
Question 28
Which of the following is an acceptable Grounding Electrode for a service?
Question 29
When installing a ground rod, what is the minimum length required to be in contact with the soil according to general NEC requirements?