Cal. Code Regs. Tit. 8, § 2833 - Interrupter Switches
(a)
Rating.
(1) Continuous Current Rating. The
continuous current rating of interrupter switches shall equal or exceed the
maximum continuous current at the point of installation.
(2) Interrupting Rating. The current
interrupting rating of interrupter switches shall equal or exceed the maximum
current which the switch will be required to interrupt.
(3) Momentary Rating. The momentary rating of
interrupter switches shall equal or exceed the asymmetrical short circuit
current available at the switch location. The asymmetrical short circuit
current shall include contributions from all connected sources of energy, such
as other lines, generators, large motors, etc.
(4) Fault Closing Rating. Interrupter
switches shall have a fault closing rating equal to or greater than the
asymmetrical short circuit current which can occur at the switch location,
unless suitable interlocks or operating procedures preclude the possibility of
closing into a fault.
(5) Voltage
Rating. The maximum voltage rating of interrupter switches shall equal or
exceed the maximum circuit voltage.
(b) Enclosure. Circuit breaker installations
located indoors shall consist of metal-enclosed units or fire-resistant
cell-mounted units, or shall be installed in a room of at least 2-hour
fire-resistive construction, or in a transformer vault.
(1) In locations accessible only to qualified
electrical workers, open mounting of circuit breakers is permitted.
(2) A means of indicating the open and closed
position of circuit breakers shall be provided.
(c) Installation Requirements. Interrupter
switches shall be so installed that the center of the grip of the operating
handle of the switch, when in its uppermost position, will be not more than 6
½ feet above the floor or working platform.
(d) Enclosures as Raceways. Switch enclosures
shall not be used as raceways for conductors feeding through, or tapping off,
to other switches, unless adequate space is provided for this
purpose.
(e) Switching of
Conductors. The switching mechanism shall be arranged to be operated from a
location where the operator is not exposed to energized parts and shall be
arranged to open all ungrounded conductors of the circuit simultaneously with
one operation. Switches shall be arranged to be locked in the open position.
Metal-enclosed switches shall be operable from outside the enclosure.
(f) Fuses. Fuses installed with interrupter
switches shall comply with the requirements of Article 24.
(g) Readily and Safely Accessible.
Interrupter switches, except those installed on poles or structures, shall be
so located that they may be operated or maintained from a readily and safely
accessible place.
(h)
Identification. Interrupter switches shall have a permanent and legible
nameplate including the following information: manufacturer's type or
designation, continuous current rating, interrupting current rating, momentary
current rating, fault closing rating, and maximum voltage rating.
(i) Stored Energy for Opening. The stored
energy operator shall be permitted to be left in the uncharged position after
the switch has been closed if a single movement of the operating handle charges
the operator and opens the switch.
Notes
2. Editorial correction of subsection (c) filed 11-3-83 (Register 83, No. 45).
3. Amendment filed 12-10-87; operative 1-9-88 (Register 88, No. 1).
4. Amendment of subsection (b), new subsections (b)(1)-(2), repealer of subsection (f), subsection relettering and amendment of NOTE filed 4-1-2009; operative 4-1-2009. Submitted to OAL for printing only pursuant to Labor Code section 142.3 (Register 2009, No. 14).
Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code.
2. Editorial correction of subsection (c) filed 11-3-83 (Register 83, No. 45).
3. Amendment filed 12-10-87; operative 1-9-88 (Register 88, No. 1).
4. Amendment of subsection (b), new subsections (b)(1)-(2), repealer of subsection (f), subsection relettering and amendment of Note filed 4-1-2009; operative 4-1-2009. Submitted to OAL for printing only pursuant to Labor Code section 142.3 (Register 2009, No. 14).
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