# HEATING VALUE DETERMINATION AND RECORDS

**Citation:** NCUC Rule R6-35  
**Type / status:** regulation / current  
**Agency:** North Carolina Utilities Commission  
**Effective:** Not stated  
**Published:** Not stated

(a) The utility may not be required to determine the heating value of the gas sold if its gas supply is purchased from pipeline companies which determine the heating value in a manner acceptable to the Commission; however, if the utility sells any of its gas on a BTU basis, it shall determine the he

## Document text

(a) The utility may not be required to determine the heating value of the gas sold if its gas supply is purchased from pipeline companies which determine the heating value in a manner acceptable to the Commission; however, if the utility sells any of its gas on a BTU basis, it shall determine the heating value and install a calorimeter in the manner provided in subsection (b)(1), (2), (3) of this rule.

(b) The utility, if required to determine heating value under subsection (a) of this rule, shall provide and maintain a calorimeter of a type acceptable to the Commission for the regular determination of the heating value of the gas sold.

(1) The calorimetric equipment shall be installed in a suitably located testing station acceptable to the Commission and subject to its inspection.

(2) The accuracy of all calorimeters, as well as the method of making heating value tests, shall be acceptable to the Commission. Recording calorimeters shall be tested with a standard gas at least once each month.

(3) Heating value test records shall be preserved for at least 3 years.

## Provenance

- Official: Yes
- Source: <https://www.ncuc.gov/ncrules/Chapter06.pdf>
- Source ID: `nc-ncuc-chapter-6`
- SHA-256: `6159ca7f2f3695f3cefdf8d2586da4bb5f95b0a0a85ac4ae61a2d7abda558b91`
- Retrieved: 2026-08-20T09:05:56.011Z
- Exported: 2026-08-22T16:51:05.773Z
- Document slug: `nc-ncuc-r6-35`

### Source metadata

```json
{
  "jurisdiction": "US-NC",
  "chapter": 6,
  "rule": "R6-35",
  "category": "adjacent-gas-safety",
  "corpusScope": "bounded-ncuc-chapter-6-pipeline-and-materially-adjacent-gas-safety",
  "selectedRuleCount": 23,
  "chapterHeadingCount": 101,
  "statutoryAuthority": "N.C. Gen. Stat. § 62-50",
  "incorporatedFederalStandards": [],
  "references": [],
  "scopeCaveat": "This is a bounded Chapter 6 pipeline/gas-safety corpus, not the entire 122-page Natural Gas chapter and not a claim to all North Carolina pipeline law. It preserves complete selected rules while excluding broader tariff, billing, customer-relations, metering-administration, service-territory, accounting, expansion-funding, and economic-development rules, plus repealed and reserved provisions.",
  "applicabilityCaveat": "Applicability depends on NCUC jurisdiction under G.S. 62-50, operator and facility status, the rule-specific definition of utility, federal/state jurisdiction and preemption, Commission exemptions or orders, and incorporated federal standards. Chapter 6 also reaches interstate natural-gas companies only insofar as the Commission has safety jurisdiction; it does not establish state jurisdiction over every pipeline or customer-owned installation in North Carolina.",
  "incorporationCaveat": "R6-39 and R6-41 incorporate federal pipeline requirements and amendments, including 49 CFR Parts 191, 192, 193, 198, and 199, with stated North Carolina modifications. Other selected rules refer to privately published ASME, NFPA, ASA, AGA, NARUC, and testing standards. This connector preserves references but does not reproduce or determine the current content, licensing terms, or legal effect of incorporated material.",
  "publicationCaveat": "The source is the current agency-hosted Chapter 6 compilation retrieved on the recorded fetch date. NCUC warns on its rules index that posting can lag an order adopting or revising a rule. Publisher history dates are retained as history entries and are not represented as effective dates unless the source expressly says so.",
  "rights": "North Carolina government text and official source links are preserved for provenance. Public availability does not determine rights in agency seals, site presentation, privately authored standards, or incorporated third-party material; redistribution and downstream use require rights review.",
  "rightsReviewRequired": true,
  "region": "NC"
}
```