REGULATIONS

Following are references and excerpts from Domestic and Foreign Regulations that have applicability to Selector Switches, Guards and Enclosures.

  • ANSI B 11.1 - 1988 (4.13.4.1)

"Stroking Selector. A means of selecting OFF, INCH, SINGLE STROKE, CONTINUOUS, MAINTAINED CONTINUOUS, or other operating modes when such functions are furnished shall be supplied with the clutch/brake control to select the mode of operation of the press. If more than one stroking selector is provided, each shall have a "remote" position, and the design shall require that all except the controlling selector be in the "remote" position before operation can be enabled. Moving any stroking selector from its "remote" position shall result in a stopping action."

  • NEMA ICS 2 - 1988 (2-216.06)

"Heavy-duty pushbutton stations shall consist of pushbuttons and/or selector switches rated in accordance with ICS 2-216.22, and/or indicating lights in accordance with ICS 2-216.23, mounted in a suitable enclosure."

  • NEMA ICS 2 - 1988 (2-216.08)

"Standard-duty selector switches shall have either two or three positions. Heavy-duty selector switches shall have two, three, or more positions."

  • NEMA ICS 2 - 1988 (2-216.22)

"Heavy-duty pushbuttons and selector switches shall have contact rating designations of A600, A300, A150, N600, N300, or N150 as shown in Table 2-125-1 for alternating current and Table 2-125-2 for direct current."

  • CEN (European Committee for Standardization) EN 418 :1992 (4.1.2)

"The control device and its actuator shall apply the principal of positive mechanical action."

  • CEN (European Committee for Standardization) EN 418 :1992 (4.4.3)

"The emergency stop actuators shall be coloured red. As far as a background exists behind the actuator and as far as it is practicable, it shall be coloured yellow."

  • Ford Manufacturing Standards EA 3 - March 1995 (3.1.6)

"Enclosure Design & Guarding: Units shall not have any sharp corners or edges, and shall be suitable for use with either a bare or gloved hand.................... All units shall have integral guards or shall be capable of being fitted with commonly available ring guards. Guards on Mechanical units shall extend a minimum of 3/16-inch, and guards on Capactive electronic units shall extend a minimum of 1/2 inch, above the top surface of the button in its unactuated state to prevent bridging the buttons with commonly found objects. On Electronic Units, the units configuration and/or guards shall prevent inadvertent operation from small objects and loose clothing (ref: ANSI B11.19, 4.2.4.2.3). All guards required in this Standard shall be either permanently attached to the unit or otherwise removable only with tools. All ring guards shall provide the abovestated height above the top of the button without the use of any seperate spacers or standoffs. Additionally, units with seperate or integral guards shall not be capable of being twisted in their mountings so that a rodlike object can be used to simultaneously actuate both Units used in a Two-Hand Trip or Control Circuit."
ASSOCIATED CONTROL
SWITCHES & ACCESSORIES

 

REES switches exceed the following:

Listed by Underwriters Laboratories per Standard UL 508 File No. E 58589

Certified by Canadian Standards Association per Standard C 22.2 File No. LR 3648

NEMA ICS 2-1988

CEN - EN 418:1992

Following are definitations of terms as relating to Pushbutton Switches:

Pushbutton - A pushbutton switch (pushbutton) is a switch having a manually operable plunger, rocker or button for actuating the switch.

Positive Break - The achievement of contact seperation as the direct result of a specified movement of the switch actuator through non-resilient members. (e.g. NOT dependant upon springs.

Positive Transfer - A contact system so designed that, it remains in one state (NO or NC) until the switch actuator moves to a "point of no return" then the contacts transfer and cannot be teased.

Slow-Make / Slow-Break - A contact system that opens and/or closes at the same rate (speed and time) that the actuator is moved.

Snap Action - A rapid motion of the contacts from one state to another, that is independant of the rate of travel of the actuator. Similar to "Positive Transfer".

Emergency Stop - A device that can be actuated in an emergency situation (one that arises from a sudden and unexpected need) and utilizes a positive mechanical action to function as a "stop category 0" device [i.e. stopping by immediate removal of power to the machine or mechanical disconnection between the hazardous elements and their machine actuator(s)].

Latching Contacts - After the cable tension has been removed the mechanical trip mechanism will return to its normal state; the contacts then require resetting through an independant means.

Operating Force - The amount of pushing or pulling force (in pounds) necessary to change the state of the switch from an at rest condition to one of contact change, that is, to make a set of Normally Open contacts or break a set of Normally Closed contacts.