40 CFR § 751.603 - Definitions.

---
identifier: "/us/cfr/t40/s751.603"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 751.603 - Definitions."
title_number: 40
title_name: "Protection of Environment"
section_number: "751.603"
section_name: "Definitions."
chapter_name: "ENVIRONMENTAL PROTECTION AGENCY"
subchapter_number: "R"
subchapter_name: "TOXIC SUBSTANCES CONTROL ACT"
part_number: "751"
part_name: "REGULATION OF CERTAIN CHEMICAL SUBSTANCES AND MIXTURES UNDER SECTION 6 OF THE TOXIC SUBSTANCES CONTROL ACT"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "15 U.S.C. 2605, 15 U.S.C. 2625(l)(4)."
regulatory_source: "84 FR 11435, Mar. 27, 2019, unless otherwise noted."
cfr_part: "751"
---


# 751.603 Definitions.

The definitions in Subpart A of part 751 apply to this Subpart unless otherwise specified in this section. In addition, the following definitions apply to this Subpart:

*3rd generation machine* means a dry-to-dry machine with a refrigerated condenser, as those terms are defined in 40 CFR part 63, subpart M.

*4th or 5th generation machine* means a dry-to-dry machine with a carbon adsorber and refrigerated condenser, as those terms are defined in 40 CFR part 63, subpart M.

*Distribute in commerce* has the same meaning as in section 3 of the Act, except that the term does not include retailers for purposes of §§ 751.613 and 751.615.

*ECEL* has the same meaning as in § 751.5 and, for PCE, is an airborne concentration of PCE of 0.14 part per million (ppm).

*ECEL action level* means a concentration of airborne PCE of 0.10 part per million (ppm) calculated as an eight (8)-hour time-weighted average (TWA).

*Energized electrical cleaner* means a product that meets both of the following criteria: (1) the product is labeled to clean and/or degrease electrical equipment, where cleaning and/or degreasing is accomplished when electrical current exists, or when there is a residual electrical potential from a component, such as a capacitor; and (2) the product label clearly displays the statements: “Energized Equipment use only. Not to be used for motorized vehicle maintenance, or their parts.”