Template · Commercial and industrial

Elevator feeder with shunt-trip disconnect single line diagram

A fused shunt-trip disconnect in the machine room, with the car lighting, machine room and pit circuits beside it. Use this for an elevator: the feeder to a fused shunt-trip disconnect in the machine room, the controller and hoist motor, and the separate circuits for car lighting and for the machine room and pit lighting and receptacles.

A free template with typical ratings, conductor callouts and general notes. Open it, change what differs on your job, fill in the title block and export a PDF.

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Elevator feeder with shunt-trip disconnect single line diagram: A fused shunt-trip disconnect in the machine room, with the car lighting, machine room and pit circuits beside it. — Elevator feeder with shunt-trip disconnect. 16 devices on an 11 × 17 in sheet with a title block and notes column.

What the reviewer checks on this drawing

The reviewer checks the lockable disconnect and where it is, what operates the shunt trip, the car lighting on its own circuit with its own fused disconnect, and the machine room and pit lighting kept on circuits separate from their receptacles and off the GFCI.

What the drawing shows

Every device on the sheet, in the order power reaches it.

Symbol	Label	Rating or detail	Conductors feeding it
From (continues off sheet)	From distribution panel	120/208V 3φ 4W
Circuit breaker	100A 3P	Elevator
Fused disconnect	Elevator disconnect	100A · fused 100A, shunt trip · in machine room	3 #3 Cu + #8 G
Device	Elevator controller (ELEV)	20 HP · 208V, 83A nameplate
Motor	Hoist motor	20 HP · 208V · 59A
Circuit breaker	20A 1P	Car lighting
Fused disconnect	Car lighting disconnect	30A · fused 20A, lockable · in machine room	2 #12 Cu + #12 G
Lighting	Car lighting and fan	120V
Circuit breaker	20A 1P	MR lighting
Lighting	Machine room lighting		2 #12 Cu + #12 G
Circuit breaker	20A 1P	MR receptacle
Receptacle	Machine room receptacle	GFCI	2 #12 Cu + #12 G
Circuit breaker	20A 1P	Pit lighting
Lighting	Pit lighting		2 #12 Cu + #12 G
Circuit breaker	20A 1P	Pit receptacle
Receptacle	Pit receptacle	GFCI	2 #12 Cu + #12 G

Notes on the sheet

Elevator disconnect is a fused switch that can be locked open, in the machine room within sight of the controller (NEC 620.51). Fuses and their size per the elevator manufacturer.
Feeder ampacity from the controller’s nameplate current plus the other loads on it (NEC 620.13). The example assumes a controller rated 83A: a continuous-rated 20 HP motor with 59A on its nameplate, × 140% for elevator duty (NEC Table 430.22(E)). Feeder on #3 Cu (100A at 75 °C), which also matches the 100A protection.
Shunt trip: where the hoistway or machine room is sprinklered, heat detectors beside the sprinkler heads open the disconnect before water flows (NFPA 72 and the elevator code). The fire alarm system supervises the shunt-trip power.
Car lighting on its own circuit, with a fused, lockable disconnect in the machine room (NEC 620.22 and 620.53).
Machine room lighting, machine room receptacle, pit lighting and pit receptacle are four separate circuits with nothing else on them (NEC 620.23 and 620.24). The lighting is not on the load side of a GFCI; the receptacles are GFCI protected.
Where the elevator has battery lowering, an auxiliary contact on the disconnect tells the controller the disconnect is open. In Canada: CEC Section 38 and CSA B44.

Diagram is schematic and not to scale. Field-verify existing equipment ratings. Ratings and conductor sizes shown are typical. Confirm against the adopted code, the equipment listing and a load calculation before installation. Code references are to the 2023 NEC and the 2024 Canadian Electrical Code: see references and editions.