Communication is where a lot of RC candidates lose easy points. The exam leans hard on COM-002-4 because in the real control room, a botched directive is how a local problem becomes a wide-area event. If you can keep three-part communication, Operating Instructions, and Reliability Directives straight, you'll bank several questions without breaking a sweat.
Why This Topic Matters
When you're coordinating across a Balancing Authority (BA), Transmission Operator (TOP), and neighboring Reliability Coordinators (RCs), the words you use — and the confirmation you get back — are the reliability control. COM-002-4 exists so that an instruction issued under stress is received, understood, and acted on exactly as intended. The exam tests whether you know the difference between a routine Operating Instruction and a Reliability Directive, and what each one obligates you to do.
Test Tips
- Know the two definitions cold. Per the NERC Glossary, an Operating Instruction is a command to change or preserve the state, status, output, or input of a BES Element or Facility — general discussion of options or information is NOT an Operating Instruction. A Reliability Directive is a communication initiated by an RC, TOP, or BA where action by the recipient is necessary to address an actual or expected Emergency. Every Reliability Directive is an Operating Instruction; not every Operating Instruction is a Reliability Directive.
- Memorize the three parts, in order. Three-part communication is: (1) the issuer states the instruction, (2) the receiver repeats it back — repeat, restate, rephrase, or recapitulate, and (3) the issuer confirms it was correct or reissues it to resolve a misunderstanding. If a question describes the issuer just "assuming" the receiver understood, that's the wrong answer.
- Watch the "identify it" trap. Under COM-002-4, when you issue a Reliability Directive you must explicitly identify the action as a Reliability Directive to the recipient. The exam loves answer choices where the operator gives a correct instruction but never flags it as a directive — that's a compliance miss.
- Don't confuse COM-002 with COM-001. COM-002-4 governs communication protocols and three-part communication. The COM-001 standard governs communication capability — having Interpersonal Communication and Alternative Interpersonal Communication available. Capability vs. protocol is a classic distractor.
- Direction matters. The obligation runs both ways: the issuer identifies and confirms; the receiver repeats back and acts. If you receive a Reliability Directive you believe cannot be safely executed, you still communicate — you don't just go silent. Silence is never the compliant choice.
- Emergency framing is the tell. If the scenario involves an actual or expected Emergency and an RC/TOP/BA is initiating action, you're almost certainly in Reliability Directive territory — which means the three-part sequence and explicit identification both apply.
5 Practice Questions
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Per the NERC Glossary, a Reliability Directive is best described as:
- A. Any routine switching order issued during a shift
- B. A communication initiated by an RC, TOP, or BA where action by the recipient is necessary to address an actual or expected Emergency
- C. A written log entry documenting a system condition
- D. A general discussion of operating options between two operators
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An RC issues an oral, two-party Operating Instruction to a TOP operator. Under COM-002-4, the receiver is required to:
- A. Acknowledge with a simple "copy" and take the action
- B. Repeat, restate, rephrase, or recapitulate the instruction back to the issuer
- C. Log the instruction and confirm by email within the hour
- D. Wait for a written follow-up before acting
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Which sequence correctly describes three-part communication?
- A. Issuer states → issuer logs → receiver acts
- B. Receiver requests → issuer states → receiver acts
- C. Issuer states the instruction → receiver repeats it back → issuer confirms it was correct or reissues it
- D. Issuer states → receiver acts → issuer documents afterward
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When issuing a Reliability Directive under COM-002-4, the issuer must first:
- A. Obtain written approval from the compliance department
- B. Explicitly identify the action as a Reliability Directive to the recipient
- C. Notify the Regional Entity before speaking
- D. Confirm the recipient's certification status
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An operator needs to establish that the required Alternative Interpersonal Communication capability is available and tested. Which standard family is the primary source for that requirement?
- A. COM-002 (operating communications / three-part communication)
- B. COM-001 (communications capability)
- C. TOP-003 (data specification)
- D. PRC-005 (protection system maintenance)
Answer Key & Explanations
- B. This matches the NERC Glossary definition of a Reliability Directive — RC/TOP/BA-initiated, with recipient action needed to address an actual or expected Emergency. A routine switching order or a discussion of options is not, by itself, a Reliability Directive.
- B. COM-002-4 R1 requires documented protocols in which the receiver of an oral two-party, person-to-person Operating Instruction repeats, restates, rephrases, or recapitulates it — the second leg of three-part communication.
- C. Three-part communication under COM-002-4 is issuer states → receiver repeats back → issuer confirms correct or reissues. The confirmation/reissue step is what closes the loop and catches misunderstandings.
- B. COM-002-4 requires the issuer to identify the action as a Reliability Directive to the recipient. Giving a correct instruction without flagging it as a directive is a common exam trap and a real-world compliance gap.
- B. The COM-001 standard governs Interpersonal Communication and Alternative Interpersonal Communication capability (having and testing the means to communicate). COM-002 governs the protocols for how instructions are issued and confirmed — capability vs. protocol.
Keep Building Reps
Communication questions are some of the most predictable points on the RC exam — but only if you've drilled the definitions and the three-part sequence until they're automatic. EPG Solutions builds RC exam-prep resources and practice questions written by people who've actually issued Reliability Directives in a live control room. Visit the EPG Solutions store to keep sharpening for exam day.