Which two statements are correct for a safe wiring installation to the terminal block of the switch or endpoint? (Choose two.)

Question

Options

• AInsert a green ground wire into the terminal block that is marked RT for return.
• BVerify that DC power is live and within 24 VDC voltage range before starting wiring.
• CVerify that the DC power circuit includes an overcurrent protective device that limits the DC
• DBecause this is a low-voltage DC circuit, anyone can install this wiring without electrical training or
• EConnect the positive 24 VDC conductor to the V terminal and connect the negative 24 VDC return
• FA ground wire can optionally be connected to the screw terminal on the front of the switch.

• A
  4% (1)
• B
  4% (1)
• C
  85% (22)
• F
  8% (2)

Explanation

Options C and E are correct because they reflect two non-negotiable electrical safety fundamentals: the DC circuit must include an overcurrent protective device (such as a fuse or breaker) to prevent damage or fire from excess current, and the polarity must be wired correctly - positive 24 VDC to the V terminal and the negative return conductor to the RT terminal.

Why the distractors are wrong:

• A is wrong because the RT terminal is the negative DC return, not a protective earth ground - inserting a green ground wire there would mislabel the circuit and create a safety hazard.
• B is wrong because you must de-energize the circuit before wiring; connecting to a live circuit risks shock, arc flash, and equipment damage.
• D is wrong because low-voltage DC circuits still require qualified personnel - many jurisdictions legally require it, and low voltage does not eliminate risk.
• F is wrong because grounding is generally mandatory, not optional, for equipment safety and code compliance.

Memory tip: Remember "Power Off, Polarity On, Protect Overcurrent" - before touching terminals, confirm power is OFF, wire with correct polarity (E), and ensure overcurrent protection exists (C). Any answer suggesting live wiring, optional grounding, or no training requirement is a red flag.

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