RCDD 12th Edition Chapter 9 Exam Questions and Answers Fully Solved
Standard for installation of lighting protection systems = - Answers NFPA 780
Primary responsibility of the ITS designer is safeguarding = - Answers Personal, property, and equipment
from foreign electrical voltages and currents
The results of such disturbances could be = - Answers - Death or injury due to electrical shock
- Destruction of electronic equip. and property due to electrical fire
- Component malfunction or degradation
- Work or process disruption
ITS designer must consider = - Answers - Lighting
- Ground potential rise
- Contact with electrical power circuits
- Electromagnetic interface (EMI)
- Radio frequency interface (RFI)
- Electromagnetic compatibility (EMC)
ITS designers are not responsible for = - Answers Engineering the portions of the electrical system
related to alternating current(AC) electrical ground faults, air terminal lighting protection systems, or
transient voltage surge protection
Best time to design a grounding protection scheme = - Answers Initial planning and construction
Bonding = - Answers Two metallic items
ITS designer is typically responsible for = - Answers Telecomm bonding and grounding and the
telecommunications circuit protectors
The ITS designer must recognize that three separate and distinct grounding systems should be in place
at every site = - Answers - AC grounding electrode system
- Equipment grounding system
- Telecomm bonding infrastructure
ITS designer has no authority over = - Answers The AC grounding electrode system
The purpose of the AC grounding electrode system(earthing system) is to = - Answers - Establish a zero
volt reference for AC electrical power systems, whether utility provided or customer derived
, - Provide a path for the dissipation of currents due to lighting or accidental contact with higher voltage
systems
- Provide a path for the dissipation of electrostatic discharge currents
The AC grounding system does not provide adequate electrical protection for = - Answers People and
equipment in the event of an electrical fault
The AC grounding electrode system consist of two main components = - Answers - Grounding electrode
conductor [GEC]
- Grounding electrode
If building steel is used a grounding electrode = - Answers ITS designer must specify that the telecomm
busbar be installed on or near a structural steel member within the TR or EF
In new construction the electrical contractor must = - Answers Provide means of access
Telecommunications personnel should not move, modify or disconnect any ground electrode conductor
without = - Answers The direct participant of a qualified electrical maintenance person
If metallic water pipes are used for grounding (earthing) = - Answers They should never be a single
ground (earth) source
The recommended max AC current value on any bonding conductor should be less than = - Answers 1
amp
The recommended max DC current values should be less than = - Answers 500 milliamperes
Two point bonding measurements = - Answers Earth ground tester
Two point bonding measurements is preformed using an earth grounding resistance tester that is
configured for? - Answers Continuity test
Maximum value for the bonding resistance between these two points is? - Answers 0.1 ohms (100
milliohms)
How do you measure grounding impedance = - Answers Ground impedance tester
The equipment grounding system impedance is dependent on a number of physical characteristics
including the = - Answers - Tightness of the equipment grounding conductor terminations
- Length of the equipment grounding conductor
-Number of bends in the equipment ground conductor path
- Size (diameter) of the equipment ground conductor
Standard for installation of lighting protection systems = - Answers NFPA 780
Primary responsibility of the ITS designer is safeguarding = - Answers Personal, property, and equipment
from foreign electrical voltages and currents
The results of such disturbances could be = - Answers - Death or injury due to electrical shock
- Destruction of electronic equip. and property due to electrical fire
- Component malfunction or degradation
- Work or process disruption
ITS designer must consider = - Answers - Lighting
- Ground potential rise
- Contact with electrical power circuits
- Electromagnetic interface (EMI)
- Radio frequency interface (RFI)
- Electromagnetic compatibility (EMC)
ITS designers are not responsible for = - Answers Engineering the portions of the electrical system
related to alternating current(AC) electrical ground faults, air terminal lighting protection systems, or
transient voltage surge protection
Best time to design a grounding protection scheme = - Answers Initial planning and construction
Bonding = - Answers Two metallic items
ITS designer is typically responsible for = - Answers Telecomm bonding and grounding and the
telecommunications circuit protectors
The ITS designer must recognize that three separate and distinct grounding systems should be in place
at every site = - Answers - AC grounding electrode system
- Equipment grounding system
- Telecomm bonding infrastructure
ITS designer has no authority over = - Answers The AC grounding electrode system
The purpose of the AC grounding electrode system(earthing system) is to = - Answers - Establish a zero
volt reference for AC electrical power systems, whether utility provided or customer derived
, - Provide a path for the dissipation of currents due to lighting or accidental contact with higher voltage
systems
- Provide a path for the dissipation of electrostatic discharge currents
The AC grounding system does not provide adequate electrical protection for = - Answers People and
equipment in the event of an electrical fault
The AC grounding electrode system consist of two main components = - Answers - Grounding electrode
conductor [GEC]
- Grounding electrode
If building steel is used a grounding electrode = - Answers ITS designer must specify that the telecomm
busbar be installed on or near a structural steel member within the TR or EF
In new construction the electrical contractor must = - Answers Provide means of access
Telecommunications personnel should not move, modify or disconnect any ground electrode conductor
without = - Answers The direct participant of a qualified electrical maintenance person
If metallic water pipes are used for grounding (earthing) = - Answers They should never be a single
ground (earth) source
The recommended max AC current value on any bonding conductor should be less than = - Answers 1
amp
The recommended max DC current values should be less than = - Answers 500 milliamperes
Two point bonding measurements = - Answers Earth ground tester
Two point bonding measurements is preformed using an earth grounding resistance tester that is
configured for? - Answers Continuity test
Maximum value for the bonding resistance between these two points is? - Answers 0.1 ohms (100
milliohms)
How do you measure grounding impedance = - Answers Ground impedance tester
The equipment grounding system impedance is dependent on a number of physical characteristics
including the = - Answers - Tightness of the equipment grounding conductor terminations
- Length of the equipment grounding conductor
-Number of bends in the equipment ground conductor path
- Size (diameter) of the equipment ground conductor
