46 CFR § 108.407 - Detectors for electric fire detection system.

---
identifier: "/us/cfr/t46/s108.407"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "46 CFR § 108.407 - Detectors for electric fire detection system."
title_number: 46
title_name: "Shipping"
section_number: "108.407"
section_name: "Detectors for electric fire detection system."
chapter_name: "COAST GUARD, DEPARTMENT OF HOMELAND SECURITY"
subchapter_number: "I-A"
subchapter_name: "A—MOBILE OFFSHORE DRILLING UNITS"
part_number: "108"
part_name: "DESIGN AND EQUIPMENT"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "43 U.S.C. 1333; 46 U.S.C. 3102, 3306; DHS Delegation No. 00170.1, Revision No. 01.4."
regulatory_source: "CGD 73-251, 43 FR 56808, Dec. 4, 1978, unless otherwise noted."
cfr_part: "108"
---


# 108.407 Detectors for electric fire detection system.

(a) Each detector in an electric fire detection system must be located where—

(1) No portion of the overhead of a space protected is more than 3 meters (10 feet) from a detector;

(2) Beams and girders extending below the ceiling of the space protected and any other obstructions do not detract from the effectiveness of the detector; and

(3) Damage to the detector is unlikely to occur if it is not protected.

(b) Each detector must be set to activate at not less than 57 °C (135 °F) and at not more than 73 °C (165 °F), except that if a space normally has a high ambient temperature each detector may be set to activate at not less than 80 °C (175 °F) and not more than 107 °C (225 °F).