CFAA Fire Alarm Technician · Question
Where should the shield (drain wire) of an SLC/DCL loop be grounded?
To prevent 'ground loops' and circulating currents which cause data errors, shields should be grounded at a single point, usually the Control Unit. All other po
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Question: Where should the shield (drain wire) of an SLC/DCL loop be grounded?
Answer options:
- At every junction box ✅ At one end only (usually the Control Unit)
- At both ends of every segment
- Shields should not be grounded
Correct answer: At one end only (usually the Control Unit)
Explanation: To prevent 'ground loops' and circulating currents which cause data errors, shields should be grounded at a single point, usually the Control Unit. All other points must be insulated.
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Question explanations
- The primary power for a fire alarm system must be:
- If a 120VAC primary power circuit for a fire alarm control unit is consuming 60 Watts of power, what is the cu
- In a steady-state DC circuit, if the conductor length is doubled while maintaining voltage and wire gauge, wha
- A resistor is rated at 10 Watts at 24VDC. If the voltage drops to 20VDC, what is the new power dissipation?
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