# 255.467 External corrosion control: electrical isolation. **Citation:** 16 NYCRR 255.467 **Type / status:** regulation / current **Agency:** New York State Public Service Commission **Effective:** Not stated **Published:** Not stated Transmission and Distribution of Gas. (a) Each buried or submerged pipeline must be electrically isolated from other underground metallic structures, unless the pipeline and the other structures are electrically interconnected and cathodically protected as a single unit. (b) One or more insulating devices must be installed where electrical isolation of a portion of a pipeline is necessary to fa ## Document text (a) Each buried or submerged pipeline must be electrically isolated from other underground metallic structures, unless the pipeline and the other structures are electrically interconnected and cathodically protected as a single unit. (b) One or more insulating devices must be installed where electrical isolation of a portion of a pipeline is necessary to facilitate the application of corrosion control. (c) Except for unprotected copper inserted in a ferrous pipe, each pipeline must be either electrically isolated from any metallic casing that is part of the underground system or, if isolation is not achieved because it is impractical, must be treated by other measures to minimize corrosion of the pipeline inside the casing. (d) Inspection and electrical tests must be made to assure that electrical isolation is adequate. (e) An insulating device may not be installed in an area where a combustible atmosphere is anticipated unless precautions are taken to prevent arcing. (f) Where a pipeline is located in close proximity to electrical transmission tower footings, ground cables or counterpoise, or in other areas where fault currents or unusual risk of lightning may be anticipated, it must be provided with protection against damage due to fault currents or lightning, and protective measures must also be taken at insulating devices. (g) For any pipeline constructed after December 1, 1993 that is located parallel and in close proximity to or crosses underneath an overhead high-voltage (69 kV or higher) electric transmission facility, the step and touch voltages induced by magnetic fields of overhead electric lines under steady state conditions shall be limited to 15 volts or less at all points where a person could normally touch the pipeline or a pipeline appurtenance. This does not apply to buried pipelines or to locations where access is limited by use of fences or barriers to personnel that are trained in safe practices regarding step and touch voltages. The short term emergency loading condition of the circuit as defined by the New York Independent System Operator for the electric facility shall be used in determining the magnitude of such step-and-touch voltages. (1) Step voltage means the root mean square voltage difference between any two points on the ground surface separated by one meter (approximately the distance of one step) in the direction of the maximum voltage gradient. (2) Touch voltage means the root mean square voltage difference between any point on the ground where a person may stand and any point on the pipeline or its appurtenances which can be touched simultaneously by either hand. ## Provenance - Official: Yes - Source: - Source ID: `ny-dps-nycrr` - SHA-256: `7c2a3aaea7e2dae66feba11464dd98445010fb0ed977685be359813a6c09f5fd` - Retrieved: 2026-08-12T06:20:40.894Z - Exported: 2026-08-22T07:47:25.061Z - Document slug: `ny-nycrr-255-467` ### Source metadata ```json { "jurisdiction": "US-NY", "title": 16, "part": "255", "partTitle": "Transmission and Distribution of Gas", "scopeKind": "gas-pipeline-safety", "tocPath": [ "Part 255 Transmission and Distribution of Gas", "Requirements for Corrosion Control" ], "legalScope": "Complete current terminal legal unit exposed by the DPS-designated Title 16 NYCRR pipeline-safety part inventory.", "applicabilityCaveat": "Applicability depends on the part and section, Commission jurisdiction, commodity and facility type, intrastate or interstate status, operator and activity, exemptions, waivers, federal preemption, Commission orders, and incorporated law. DPS inspects portions of interstate systems for PHMSA, but PHMSA retains federal enforcement authority. DPS states that all jurisdictional Part 256 gas-holder and Part 257 LPG-plant facilities have been decommissioned even though those regulations remain unrepealed.", "incorporationCaveat": "These parts incorporate or rely on federal pipeline regulations, federal and New York statutes, Commission rules and orders, and privately authored technical standards. Part 10 supplies incorporation details. References metadata preserves explicit citations but does not reproduce external material, determine licensing rights, or decide whether a particular incorporation is static or dynamic.", "publicationCaveat": "The New York Department of Public Service identifies these eleven Title 16 NYCRR parts as its state pipeline-safety regulations and links to the public DOS/Westlaw NYCRR reading copy. That site labels the online text unofficial and directs users needing evidentiary accuracy to the Official NYCRR maintained by the Department of State Division of Administrative Rules. Each section's 'Current through' date is the most recent official NYCRR supplement covering that section, not a uniform corpus-wide amendment date.", "rights": "New York government-edict text is preserved with DPS, Department of State, and publisher attribution. The public reading site's presentation and enhancements, agency marks, forms, annotations, and incorporated federal or privately authored standards require separate rights review; this connector does not claim rights in those materials.", "rightsReviewRequired": true, "currentThrough": "2024-05-31", "historyEvents": "No event is emitted because the section reading copy does not supply an explicit adoption, filing, or effective-date history.", "publisherCitation": "16 CRR-NY 255.467", "identityAnomaly": null, "references": [], "region": "NY" } ```