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Standards that apply to Machines Driven
By 120 and 240 Volt Motors:
| OSHA |
(U.S. Occupational Safety and Health
Administration 29 CFR #1910.213. (b) (3)*) |
"On applications where injury to the operator might
result if motors were to restart after a power failure, provisions shall
be made to prevent machines from automatically restarting upon restoration
of power."
*Electrical Controls for Wood Working Machinery
| NFPA 79 |
(Electrical Standard
for Industrial Machinery,
2002 Edition) |
"7.5.3 Restarting. Upon restoration of the voltage or upon switching on the incoming supply, automatic or unintentional
restarting of the machine shall be prevented when such a restart can cause a hazardous condition."
And Annex A:
"A.3.3.104 Undervoltage Protection. The principal objective of this device is to prevent
automatic restarting of the equipment."
| NEC 2005 |
(NFPA 70: National Electrical Code, International Electrical Code Series) |
430.43 Automatic Restarting. . . . A motor overload device that can restart a motor automatically after overload tripping shall not be installed if automatic restarting of the motor can result in injury to persons.
| CSA C22. 1-98 |
(Canadian Electrical
Code Part 1, 28-400 (a) undervoltage protection required for motors) |
"When automatic restarting is liable to create
a hazard, the motor control device shall provide low-voltage protection."
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