SynC · Topic
These are the standards in the SynC Standards library that cover Switchgear. Each one is a complete, plain-language specification: the scope it applies to, the requirements that govern it, and a structured equipment datasheet listing the values a project has to decide — ratings, materials, setpoints, and the standards each is verified against. All of it is free to read without an account and published under CC BY-SA 4.0.
A standard usually carries several topics, so most of the entries below also appear under neighbouring subjects. The topics each one carries are listed on its own page.
Automatic transfer switches rated 1000 V and below, listed to UL 1008, that move a load between a normal source and an alternate source without operator action. Covers the switching mechanism, transition type, bypass-isolation construction, neutral treatment, the controller and its sensing, time delays, exerciser, load management and communications provisions, ratings including withstand and closing and short-time ratings, service-entrance construction, enclosures, identification, factory and field testing, installation, warranty, and spare parts, for switches serving emergency, legally required standby, optional standby, critical operations, and health care essential electrical system loads.
Cast-in-place concrete equipment pads and housekeeping pads that receive mechanical, electrical, and plumbing equipment - generators, pad-mounted and dry-type transformers, switchgear and switchboard lineups, chillers, air handlers, condensing units, pumps, compressors, boilers, and similar equipment - whether the pad bears on grade, on an interior finished floor, on a structural slab, or on an exterior platform. Covers the decisions a pad standard actually owns: pad geometry and height, attachment to the supporting concrete, reinforcement method, cast-in and post-installed equipment anchorage, cast-in raceway and grounding provisions, liquid containment, surface finish and grout bed, isolation from adjacent construction, dimensional and anchorage tolerances, and the verification performed before concrete is placed and before equipment is set.
Stationary battery systems with chargers providing 24, 48, 125, or 250 VDC control power to switchgear protective relays, breakers, transfer switches, communications, generator starting, emergency lighting inverters, and other critical control loads in substations, generating stations, industrial facilities, and electrical rooms. Covers vented lead-acid (VLA), valve-regulated lead-acid (VRLA), and vented nickel-cadmium (Ni-Cd) chemistries; their chargers; DC distribution; battery monitoring; and the battery room or cabinet. Cross-references the loads they serve (see Low Voltage Switchgear and Medium Voltage Switchgear) and grounding of the DC system (see Grounding And Bonding).
Identification labels, nameplates, warning signs, panel directories, and color-coding for electrical distribution equipment and wiring rated 600V and below and for medium-voltage equipment served by the same project — switchgear, switchboards, panelboards, transformers, motor control centers, disconnects, automatic transfer switches, junction boxes, raceways, and conductors. Covers arc-flash warning labels driven by the arc-flash study, voltage-class and system color coding (normal, emergency, critical, standby, fire alarm, security), panelboard circuit directories, disconnecting-means identification, available fault current marking, and conductor and conduit identification.
Dedicated indoor electrical rooms and closets housing service entrance equipment, distribution switchgear, switchboards, panelboards, motor control centers, dry-type transformers, automatic transfer switches, indoor standby generators or paralleling switchgear, DC battery systems, and the associated grounding, raceway, and control infrastructure for commercial, institutional, healthcare, higher-education, data center, and industrial buildings. Covers working clearances, dedicated electrical space, headroom, door and egress arrangement, fire-resistance ratings of enclosing assemblies, ventilation and cooling for equipment heat rejection, room illumination, convenience power, drainage and plumbing restrictions, security and access control, equipment anchorage, finishes, and signage.
Metal-enclosed, low voltage power circuit breaker switchgear rated 600V and below for commercial, institutional, and industrial facilities. Covers indoor and outdoor configurations with drawout power circuit breakers.
Metal-clad medium-voltage switchgear rated above 1 kV through 38 kV using drawout vacuum or SF6 circuit breakers, built to IEEE C37.20.2 and the ANSI/IEEE C37.04 / C37.06 / C37.09 series, for utility-customer substations, large commercial campuses, healthcare and higher-education central plants, data centers, and industrial facilities. Covers 5 kV, 15 kV, 27 kV, and 38 kV voltage classes, indoor and outdoor walk-in (protected aisle) configurations, arc-resistant ratings per IEEE C37.20.7, multifunction microprocessor protective relays, and optional IEC 61850 station bus communications.
Calculation of available three-phase and line-to-ground short-circuit currents at every bus, transformer secondary, switchboard, panelboard, motor control center, and significant motor connection in a low- or medium-voltage power distribution system. The study output is used to specify equipment interrupting ratings, withstand ratings, and bus bracing, and to verify that installed and proposed equipment complies with NFPA 70 Article 110.9 and 110.10.