Electrical Grounding Safety
1. A ground fault is: a) energized frames resulting from electrical conductivity between energized conductors and equipment frames, b) a fault with the grounding system
2. A person who touches a metal frame where a ground fault condition occurs always receives a shock. T__, F__
3. A ground fault circuit interrupter turns the circuit off when: a) the current flow is too high, b) the voltage is too high, c) 5 ma of current leaves the circuit.
4. A ground fault circuit interrupter protects against the following: a) a person touching an energized equipment frame: a) whose body is also in contact with the ground, b) whose body is in contact with the neutral conductor.
5. All metal frames must be connected : a) through the equipment grounding conductor to the neutral conductor at the source, b) to the ground fault circuit interrupter, c) to the earth.
6. To protect persons from being electrocuted due to a ground fault: a) the resistance of the equipment grounding conductor must be very low, b) the circuit must be protected by a fuse or circuit breaker with the correct ampere rating, c) the circuit must be protected by a fuse or circuit breaker with the correct current interrupting rating (IR or Underwriters Current Limiting (CL) rating), d) downstream electrical components must have sufficient “withstand” capabilities to carry the calculated fault current.
7. Typically, the grounded conductor carries more of the fault current than the grounding electrode conductor. T__, F__
8. The resistance of the equipment grounding conductor can be tested using virtually any good ohm meter. T__, F__
9. Grounding electrode system resistance” is tested using a relatively high-priced tester that has been specifically designed for this purpose. T__, F__
10. The procedure for ground bed testing is referred to as a) the 3-point method, b) the fall of potential method, c) the 62 % method.
11. A grounding electrode system which passes the test has a sufficiently low resistance to protect a person from being electrocuted in the event of a ground fault. T__, F__
12. Factors, which determine grounding electrode system resistance include: a) number of rods or mesh, b) length of rods or mesh, c) depth of rods or mesh, d) ground moisture content, e) dissolved minerals, g) freezing conditions, h) soil type, i) soil particle size , j) soil packing, k) distance between ground conductors or electrodes.
Electrical Grounding Safety - Answers
1. A ground fault is: a) energized frames resulting from electrical conductivity between energized conductors and equipment frames, b) a fault with the grounding system
2. A person who touches a metal frame where a ground fault condition occurs always receives a shock. T__, F__
3. A ground fault circuit interrupter turns the circuit off when: a) the current flow is too high, b) the voltage is too high, c) 5 ma of current leaves the circuit.
4. A ground fault circuit interrupter protects against the following: a) a person touching an energized equipment frame: a) whose body is also in contact with the ground, b) whose body is in contact with the neutral conductor.
5. All metal frames must be connected : a) through the equipment grounding conductor to the neutral conductor at the source, b) to the ground fault circuit interrupter, c) to the earth.
6. To protect persons from being electrocuted due to a ground fault: a) the resistance of the equipment grounding conductor must be very low, b) the circuit must be protected by a fuse or circuit breaker with the correct ampere rating, c) the circuit must be protected by a fuse or circuit breaker with the correct current interrupting rating (IR or Underwriters Current Limiting (CL) rating), d) downstream electrical components must have sufficient “withstand” capabilities to carry the calculated fault current.
7. Typically, the grounded conductor carries more of the fault current than the grounding electrode conductor. T__, F__
8. The resistance of the equipment grounding conductor can be tested using virtually any good ohm meter. T__, F__
9. Grounding electrode system resistance” is tested using a relatively high-priced tester that has been specifically designed for this purpose. T__, F__
10. The procedure for ground bed testing is referred to as a) the 3-point method, b) the fall of potential method, c) the 62 % method.
11. A grounding electrode system which passes the test has a sufficiently low resistance to protect a person from being electrocuted in the event of a ground fault. T__, F__
12. Factors, which determine grounding electrode system resistance include: a) number of rods or mesh, b) length of rods or mesh, c) depth of rods or mesh, d) ground moisture content, e) dissolved minerals, g) freezing conditions, h) soil type, i) soil particle size , j) soil packing, k) distance between ground conductors or electrodes.
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A housing unit, each unit in a residential building that consumes energy for the benefit of people and the necessary (residential) equipped to function autonomously. Homes where no heating is present, not being a revival or delivery system, should not have an Epc services.
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