# HEATING VALUE

**Citation:** NCUC Rule R6-34  
**Type / status:** regulation / current  
**Agency:** North Carolina Utilities Commission  
**Effective:** Not stated  
**Published:** Not stated

(a) Manufactured and Mixed Gas. - The heating value of manufactured gas and mixed gas, including LP Gas mixed with air, shall be considered as being under the control of the utility, except that natural gas when mixed with manufactured or LP Gas for peak shaving or emergency purposes shall not be co

## Document text

(a) Manufactured and Mixed Gas. - The heating value of manufactured gas and mixed gas, including LP Gas mixed with air, shall be considered as being under the control of the utility, except that natural gas when mixed with manufactured or LP Gas for peak shaving or emergency purposes shall not be considered a mixed gas.

(1) The average heating value on any one day shall not exceed or fall below the standard total heating value (see Rule R6-5(1)(a)) by more than five percent.

(2) The monthly average heating value shall be not less than the standard total heating value.

(b) Natural and LP Gas. - The heating value of natural gas and undiluted, commercially pure LP Gas shall be considered as being not under the control of the utility.

(c) When Appliances to Be Readjusted. - The utility shall determine the allowable range of monthly average heating values within which its customers' appliances may be expected to function properly without repeated readjustment of the burners. If the monthly average heating value is above or below the limits of the allowable range for two successive months, the customers' appliances must be readjusted in accordance with Rule R6-18.

## Provenance

- Official: Yes
- Source: <https://www.ncuc.gov/ncrules/Chapter06.pdf>
- Source ID: `nc-ncuc-chapter-6`
- SHA-256: `e88658ada959ad724c3f158db6642332f42bc4f46370d4512b106cdcf38a37d4`
- Retrieved: 2026-08-20T09:05:56.011Z
- Exported: 2026-08-23T19:27:45.228Z
- Document slug: `nc-ncuc-r6-34`

### Source metadata

```json
{
  "jurisdiction": "US-NC",
  "chapter": 6,
  "rule": "R6-34",
  "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": [
    {
      "citation": "R6-5",
      "referenceType": "north-carolina-commission-rule",
      "url": "https://www.ncuc.gov/ncrules/Chapter06.pdf"
    },
    {
      "citation": "R6-18",
      "referenceType": "north-carolina-commission-rule",
      "url": "https://www.ncuc.gov/ncrules/Chapter06.pdf"
    }
  ],
  "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"
}
```