Elevators and Escalators - hdbk109220040103

DOE-HDBK-1092-2004

OSHA Sections 29 CFR 1910.269 (p)(4), 1926.952 (b)

Figure 6-2. A minimum clearance of 10 ft between overhead power lines and

equipment is required for 50 kV and below while a clearance of 10 ft plus 4 in. for

every kV above 50 kV is required.

6.3

ELEVATORS AND ESCALATORS

Elevators and escalators are used to move people and elevators are also used to move

materials. Design, installation, inspection, and maintenance activities require specialized

knowledge for safe operation and use.

6.3.1

CODES AND STANDARDS

A comprehensive electrical safety program for elevators and escalators can be achieved

through the application of the correct codes and standards. All elevators are required to be

constructed, installed, and maintained in accordance with ANSI/ASME A17.1. Reference

standards include NFPA 70 (NEC) for the electrical equipment wiring and NFPA 101 (Life

Safety Code). These standards reflect the interrelated roles of electrical design, maintenance,

and fire protection in the electrical safety process.

6.3.2

DESIGN SPECIFICATIONS

The electrical designer shall provide for the installation requirements of Article 620 of the NEC

as well as the ANSI/ASME A17.1 requirements for signaling, automatic fire protection, and

emergency power as required. The manufacturer shall provide the required fire service key

switches, audible alarm devices, and internal wiring up to the terminal strips in the elevator

control panel.

6.3.2.1 VOLTAGE AND CURRENT LIMITATIONS

There shall be a 300-V limitation on all operating control and signal circuits and related

equipment, including door operators. Exceptions are permitted for 25 to 60 Hz ac if the current

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