NEMA locking (twist-lock) plugs L5-15 to L23-30: voltage, poles, wires and amp rating by family (L5-20, L6-20, L6-30, L14-30, L21-30) — dimension sheet Source: Xem Studio, https://xemstudio.com/objects/nema-locking-plugs-l5-l6-l14-l21/ (sheet CC BY 4.0) Basis: Elliott Electric's NEMA twist-lock chart, AutomationDirect's wiring-devices catalog and Wikipedia's NEMA connector article; configuration table only, no blade dimensions and no files Catalog version: 2026-10-20 Sizes: see table below - Reading a name: L = locking (twist-lock, curved blades), the number after it is the family (voltage, poles and wires), the number after the hyphen is the amp rating, and a trailing P / R / C is plug, receptacle or corded connector (flanged inlet FI and outlet FO also exist). So L5-20P is a 20 A, 125 V, 2-pole 3-wire grounded locking plug; L6-30R is a 30 A, 250 V receptacle; L14-30P is 30 A, 125/250 V, 3-pole 4-wire grounded; L21-30P is 30 A, three-phase wye 120/208 V, 4-pole 5-wire grounded. - Sources: Elliott's chart gives voltage, poles / wires and the amp ratings for each family; AutomationDirect's catalog tables list the individual configurations with amps, volts, poles and wires for L5 to L9, L14 to L17, L21 and L22; Wikipedia adds L10 to L13 and L19 to L21 wording. Where they differ both are shown: Elliott calls L10 '3-pole, 3-wire ungrounded' and Wikipedia '2-pole + neutral, non-grounding'; Elliott calls L19 and L20 '4-pole, 4-wire' and Wikipedia '3-pole, four-wire'. L17 appears only in AutomationDirect's tables. - Not given: blade and pin dimensions of the locking configurations. They are in ANSI/NEMA WD 6, which is sold, and Wikipedia states no locking dimensions. The blade numbers for L5-30 and L14-30 that public summaries print are on nema-plug-receptacle-configurations; this page adds the other families. - Elliott's page has visible linking slips (for example the L11 plug row links to an L10-20P page and L23 receptacles link to L22 pages); only the printed chart text is used. A 15 A rating is shown only where the chart lists it (L5, L6, L7; Wikipedia also names L11-15). - No file: a plug drawn from the voltage and amp rating would not be the part you can buy. Maker CAD: McMaster-Carr lists twist-lock devices with per-part STEP; not linked here. family voltage as published poles / wires amp ratings (A) notes L5 125 V 2-pole, 3-wire, grounded 15, 20, 30 AD lists L5-15, L5-20, L5-30 L6 250 V 2-pole, 3-wire, grounded 15, 20, 30 AD lists L6-15, L6-20, L6-30 L7 277 V AC 2-pole, 3-wire, grounded 15, 20, 30 AD lists L7-15, L7-20, L7-30 L8 480 V AC 2-pole, 3-wire, grounded 20, 30 AD lists L8-20, L8-30 L9 600 V AC 2-pole, 3-wire, grounded 20, 30 AD lists L9-20, L9-30 L10 125/250 V 3-pole, 3-wire, ungrounded 20, 30 Wikipedia words it '2-pole + neutral, non-grounding' L11 3-phase 250 V 3-pole, 3-wire, ungrounded 20, 30 Wikipedia also names L11-15 L12 3-phase 480 V 3-pole, 3-wire, ungrounded 20, 30 L13 3-phase 600 V 3-pole, 3-wire, ungrounded 30 L14 125/250 V 3-pole, 4-wire, grounded 20, 30 AD lists L14-20, L14-30 L15 3-phase 250 V 3-pole, 4-wire, grounded 20, 30 AD lists L15-20, L15-30 L16 3-phase 480 V 3-pole, 4-wire, grounded 20, 30 AD lists L16-20, L16-30 L17 3-phase 600 V 3-pole, 4-wire, grounded (AD) 30 AD lists L17-30; not on Elliott's chart L18 3-phase wye 120/208 V 4-pole, 4-wire, ungrounded 20, 30 Wikipedia: '4-pole, no ground' L19 3-phase wye 277/480 V 4-pole, 4-wire, ungrounded (Elliott) 20, 30 Wikipedia words it '3-pole, four-wire, non-grounding': poles disagree L20 3-phase wye 347/600 V 4-pole, 4-wire, ungrounded (Elliott) 20, 30 Wikipedia words it '3-pole, four-wire, non-grounding': poles disagree L21 3-phase wye 120/208 V 4-pole, 5-wire, grounded 20, 30 AD lists L21-20, L21-30 L22 3-phase wye 277/480 V 4-pole, 5-wire, grounded 20, 30 AD lists L22-20, L22-30 L23 3-phase wye 347/600 V 4-pole, 5-wire, grounded 20, 30 AD shows L23-20R and L23-30R in its wiring diagrams only Files elsewhere (not hosted by Xem Studio; license as stated by the publisher): - Elliott Electric: NEMA twist lock plug, receptacle and connector configuration chart (L5 to L23; voltage, poles, wires, 15 / 20 / 30 A) — web — Publisher's page; dimensions are facts — https://elliottelectric.com/nema-twist-lock-plug-receptacle-connector-chart.aspx - AutomationDirect: Wiring devices: plugs, connectors and receptacles catalog (locking L5 to L22: amps, volts, poles, wires) — web — Publisher's page; dimensions are facts — https://cdn.automationdirect.com/static/specs/wiringdevicesplugsconnsreceps.pdf - Wikipedia: NEMA connector (locking L-series: voltage, poles, wiring; curved-blade twist-locking) — web — CC BY-SA 4.0 (text); ratings are facts — https://en.wikipedia.org/wiki/NEMA_connector No true-size file yet: the published figures do not fix the whole shape; a measured scan is planned. API: https://xemstudio.com/api/geometry?object=nema-locking-plugs-l5-l6-l14-l21