Switchgear

Module from the Electrical Engineering Curriculum curriculum.

Module 4 - Switchgear and Motor Control Centers · Learning Objectives · 1. Apply ANSI C37 ratings: continuous, short-time, interrupting · 2. Select LV power panelboards (ANSI), MCCs, or PDP by load type · 3. Specify MV switchgear with vacuum or SF6 breakers · 4. Verify bus bracing and arc-flash/arc-resistance · 5. Apply 2-second short-time withstand coordination with upstream · Switchgear Ratings Reference

Class	Voltage	Continuous A	SC kA	Common Use	Standard
LV panelboard	480V	225-1200	22-65 kA	Lighting/small motor	UL 67
LV switchgear	480V	800-5000	42-85 kA	Plant distribution	ANSI C37.20.1
MCC 600V class	480V	600-2500	22-65 kA	Motor starters grouped	UL 845 / NEMA ICS 18
MV switchgear 5 kV	4.16 kV	1200-3000	25-63 kA	MV distribution	ANSI C37.20.2
MV switchgear 15 kV	13.8 kV	1200-3000	25-63 kA	Plant primary	ANSI C37.20.2
MV metal-enclosed switch	15 kV	600-1200	12 kA	Feeder sectionalizing	IEEE C37.20.3

Source: Electrical_Engineering_Curriculum_v1.xlsx · Sheet: Switchgear

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