REGULATIONS

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

  • NEMA ICS 2 - 1988 (2-216.02) "GUARDED PUSHBUTTON"

A guarded pushbutton is a pushbutton so constructed that when properly mounted, the chance of inadvertent operation will be minimal. Recognized constructions are listed below.

  1. Recessed Pushbutton - A pushbutton which has its surface for applied force below the surrounding surface in its initial and operated positions.
  2. Shrouded Pushbutton - A pushbutton which has the relationship between the guard and the actuating means specified by the manufacturer.
  3. Shielded Pushbutton - A pushbutton which requires some movement to operate which is essentially perpendicular to the movement required to enter the shield.
  4. Covered Pushbutton - A pushbutton having an automatically returnable cover which must be displaced prior to operating the pushbutton.
  5. Lockable Pushbutton - A pushbutton which includes provision for locking in specified positions.
  • PUSHBUTTON

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

  • 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 1 - Sept. 1994 (1.1)

"This standard applies primarily to standard size, heavy duty, one-hole mounted, oil-tight push buttons and accessory devices such as selector switches, pilot lights, etc., for mounting as described in Section 2.1.1."

  • Ford Manufacturing Standards EA 1 - Sept. 1994 (1.4.1)

"A "unit" as used throughout this Standard means any push button, selector switch, pilot light, etc., suitable for single hole mounting."
30.5 mm
CONTROL UNITS

 

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.