The electrical safety requirements for specific equipment are determined by the following standards:

1. NFPA 70, National Electrical Code (NEC)

2. 29 CFR 1910, Occupational Safety and Health Standards

3. 29 CFR 1926, Safety and Health Regulations for Construction.

4. NFPA 70E, Standard for Electrical Safety Requirements for Employee Workplaces.

29 CFR 1910 and 1926 frequently reference other safety guidelines for design, operation, and maintenance. Such other guidelines comprise ANSI, ASTM and IEEE specifications and information derived from various engineering sources or equipment manufacturer association standards. However, the key document is NFPA 70, the NEC; all the other documents are keyed to it. The NEC reflects wiring and installation requirements that provide for a safe electrical system.

6.1 CONVEYING SYSTEMS

Conveying systems are used to move materials, goods, etc., from one place to another. Because of their conditions of use, they are usually classified in service applications as intermittent duty perNEC Tables 430-22(a) and 620-15.

6.1.1 GENERAL DESIGN, INSTALLATION, MAINTENANCE, AND INSPECTION REQUIREMENTS

The general design criteria for elevators, dumbwaiters, wheelchair lifts, escalators, and cranes should comply with:

1. ASME/ANSI A17.1, Safety Code for Elevators and Escalators

2. NFPA 70, National Electrical Code

3. ANSI C-2, National Electrical Safety Code (NESC)

4. Uniform Building Code, Chapter 51 (except enclosures)

5. 29 CFR 1910, Occupational Safety and Health Standards

6. 29 CFR 1926, Safety and Health Regulations for Construction

7. Uniform Federal Accessibility Standard (UFAS), Handicapped Wheelchair Lifts

8. National Electrical Manufacturers Association (NEMA) Standards

9. NFPA 101, Life Safety Code, Chapters 6 and 7

10. Crane Manufacturers Association of America (CMAA)-70, Specifications for Electrical Overhead Traveling Cranes

11. CMAA-74, Specifications for Top Running and Under Running Types of Single Girder Electric Overhead Traveling Cranes

All conveying systems shall be suited to the occupancy requirements of the location where they are installed. Where they penetrate a security barrier, they shall provide the same degree of penetration resistance and intrusion detection as is required by the site-specific security plan.

Additional applicable codes and standards for maintenance and inspection are listed below and provide an overview of electrical and maintenance and inspection requirements.

1. CMAA Crane Operators' Manual

2. CMAA Overhead Crane and Inspection Checklist

3. ANSUASME B30.2, Overhead and Gantry Cranes

4. ANSUASME B30.11, Monorail Systems and Underhung Cranes

5. ANSUASME B30.16, Overhead Hoists

6. ANSUASME A17.2.1, "Inspectors Manual for Electric Elevators." ANSUASME A17.2.2, "Inspectors Manual for Hydraulic Elevators." ANSUASME A17.2.3, "Inspectors Manual for Escalators and Moving Walks."

7. ANSUASME A17.3, Safety Code for Existing Elevators and Escalators.

6.1.2 ELECTRICAL DESIGN CRITERIA

Electrical design criteria should be closely coordinated with the architect, structural engineer, fire protection engineer, mechanical engineer, and electrical safety engineer to ensure that all discipline requirements are coordinated and met.

Factory and field performance tests and control and wiring diagrams should be specified in the purchase order or contract because they are not otherwise provided by the factory. Acceptance tests conductedby the factory representative, qualified independent inspector, or engineer are recommended. Tests conducted by Underwriters Laboratory (UL) and Factory Mutual Engineering Corporation (FM) are also acceptable.

ANSI and CMAA standards should be carefully reviewed to ensure that all applicable safety requirements are covered in the specifications.

The designer should specify the following requirements:

1. Available system voltage

2. Control voltage

3. The motor is constructed for the specific application

4. Motor horsepower, service factor, insulation class, and time ratings are sufficient to meet the load requirements

5. Working clearances and space requirements

6. Disconnecting means and other NEC requirements.