Differences Between Switchboards, Switchgears, and Panelboards

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What Are the Main Differences Between Switchgear, Switchboards, and Panelboards?
	Switchgear	Switchboards	Panelboards
	Substations	Industrial
Standards	ANSI STD C37.20.1 UL STD 1558 NEMA STD SG-5	NEMA PB-2 UL 891	NEMA PB-1 UL 67 UL 50
Lug Standards	ANSI/NEMA CC 1-2009
Lug Mounting Bolt Configuration	NEMA C1-2009 1/2" bolt and 1.75" spacing	3/8" bolt and 1.375" spacing (?)	3/8" bolt and 1.375" spacing (?)
Dielectric Voltage	2200 V	2X Rated Volts + 1000V	2X Rated Volts + 1000V
In Use Voltages	Nominal Voltage + 5.8%	Nominal Voltage 240V, 480V, 600V
Circuit Protection	LV PCB (Low Voltage power curent breakers) ANSI 37-13 NEMA SG-3 UL1066	ICCB In Circuit Circuit Breaker Molded Case Circuit Breaker MCCB UL 489 Fusible Switches UL508 and UL 977 Fusible Switches UL 98 Power Circuit Breaker UL 1066 5000A Max Main	Molded Case Circuit Breaker MCCB UL 489 Fusible Switches UL 98 1200A Max Main
Short Circuit Test	Unfused 15% PF (Power Factor) 30 cycles	20% PF (Power Factor) 3 cycles Must have "instantaneous" trip funtion to maintain UL 891 rating
Panel Mounting and Access	Generally requires rear and front access which takes up more space	Free Standing May be mounted against a wall if < 45" deep allowing front access only but saves space Front or rear access	Flush or surface wall-mounted with front access only
Cost Continuity of Power	Generallly higher cost but increased power continuity likelihood	Generally lower cost but more likely than switchgear to have a power trip outage
Phases		Usually 3 phase	1 or 3 phase

NEMA Bolt Hole Deminsional Requirements for Terminal Connectors

nema 1 hole layout

Ref. ANSI/NEMA CC 1-2009 Electric Power Connection for Substations, Annex C

Alternate mounting hole spacing and bolt size, non NEMA standard

1 3/8SPACING 3/8 MOUNTING BOLT LAYOUT

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