Reglamento General de Seguridad e Higiene Industrial, Cap. IV -- Ascensores de personas. No incluido en el índice bajo Ley 149 de 12 dic, 2005

Hoistway doors shall be equipped with hoistway unit system hoistway-door interlocks. 111. 1b - For power freight elevators. The hoistway doors will be provided with an interlock hoistway unit system. Exceptions (1) Hoistway-unit system combination mechanical locks and electric contacts may be used for manually opened vertically sliding counterweighted or vertically sliding biparting counterbalanced doors under the following conditions: (a) Elevators with a travel of fifteen (15) feet or less. For the top landing door and for any door whose sill is located not more than four (4) feet below the sill of the top landing door. (b) Elevators with any travel. For any door whose sill is within five (5) feet of the bottom of the pit. (2) Combination mechanical locks and electric contacts may be used on the door at the bottom landing of sidewalk elevators (See Part IV, Section 401, Rule 401.5b) 15 - TEXTO EN ESPAÑOL es un número empírico que indica el efecto de los cambios de temperatura en la viscosidad de los aceites. Un indice de viscosidad bajo significa relativamente, un amplio cambio de viscosidad con la temperatura. Para información adicional pertinente a las ecuaciones, tablas y cómputos, vea el ASTM Standard 1964, Parte 17, Páginas 243-250. United States