Issue:
Product design features
Product Line:
Heavy Duty Safety Switches
Resolution:
For safety switches, the standard for design and testing of the number of switching operations is governed by UL98 and NEMA KS-1.There are two separate tests: (1) endurance test, and (2) horsepower-overload test. The below table shows the minimum number of operations required (OFF to ON to OFF) by UL and NEMA, as well as the number of operations required by Square D:
* endurance test done at switch rated load current
** horsepower test - make/break motor inrush/locked rotor current at rated HP
Product design features
Product Line:
Heavy Duty Safety Switches
Resolution:
For safety switches, the standard for design and testing of the number of switching operations is governed by UL98 and NEMA KS-1.There are two separate tests: (1) endurance test, and (2) horsepower-overload test. The below table shows the minimum number of operations required (OFF to ON to OFF) by UL and NEMA, as well as the number of operations required by Square D:
| Endurance Test Number of Ops | HP Test Number of Ops | |||
| Test Standards | Rated Load* | No Load | Total (L+NL) | At Rated HP** |
| UL | 500 | 2000 | 2500 | 10 |
| NEMA | 600 | 1900 | 2500 | 10 |
| Square D | 600 | 2000 | 2600 | 10 |
* endurance test done at switch rated load current
** horsepower test - make/break motor inrush/locked rotor current at rated HP
Released for:Schneider Electric USA
