USCG Exam PracticeSwitchboards and distribution systems
Under 46 CFR §183.330, what minimum working space must be maintained in front of a main distribution panel or switchboard?
- A. 455 millimeters (18 inches)
- B. 305 millimeters (12 inches)
- ✓ 610 millimeters (24 inches)Correct
- D. 760 millimeters (30 inches)
Why C is correct
46 CFR §183.330(e) specifies that working space of at least 610 millimeters (24 inches) must be provided in front of all main distribution panels and switchboards. The 455 mm (18 inch) figure applies to the required working space behind the switchboard.
Cited:46 CFR §183.330