TUNE YOUR LOOP: Electrical Noise Effects on Instrumentation Control Equipment

TUNE YOUR LOOP: Questions to keep you sharp.

Tune Your Loop is a series of posts consisting of questions from ISA Training Courses.

1. For a ground to be an effective ground it must have a low resistive path to earth
(or the conductive surface used as earth).

  1. TRUE
  2. FALSE

2. What National Electrical Code (NEC) Article governs grounding?

  1. 240
  2. 250
  3. 430
  4. 501

3. Potential is measured in volts.

  1. TRUE
  2. FALSE

4. Lightning is a form of ESD.

  1. TRUE
  2. FALSE

5. DC Control voltage (24 V or less) must be grounded.

  1. TRUE
  2. FALSE


What are your answers before you read ahead?

1. a

2. b

3. a

4. a

5. b


From the ISA Course Electrical Noise Effects on Instrumentation Control Equipment (TI21) pre-instructional survey.


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  • Mike Nager

    Related to Question 5 – I once took a poll of system integrators and asked if they typically ground the negative terminal of a 24 VDC power supply and why or why not. The range of answers was quite eye-opening!

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