EMC Student Wiring Guide - the Georgia Agriculture Curriculum ...

CAUTION — ENGINEERED SERIES COMBINATION
SYSTEM RATED ____ AMPERES. IDENTIFIED
REPLACEMENT COMPONENTS REQUIRED.
FPN: See Section 240.86(A) for engineered series combination
system.
5.4.3 Tested Series Combination Systems: Where circuit breakers or fuses
are applied in compliance with the series combination ratings
marked on the equipment by the manufacturer, the equipment
enclosure(s) shall be legibly marked in the field to indicate the
equipment has been applied with a series combination rating. The
marking shall be readily visible and state the following:
CAUTION — SERIES COMBINATION SYSTEM RATED
____ AMPERES. IDENTIFIED REPLACEMENT
COMPONENTS REQUIRED. NEC 110.22
6. BRANCH CIRCUIT WIRING
6.1 LENGTH OF FREE CONDUCTORS AT OUTLETS, JUNCTIONS,
AND SWITCH POINTS:
6.1.1 At least 150 mm (6 in.) of free conductor, measured from the point
in the box where it emerges from its raceway or cable sheath, shall
be left at each outlet, junction, and switch point for splices or the
connection of luminaries (fixtures) or devices.
6.1.2 Where the opening to an outlet, junction, or switch point is less
than 200 mm (8 in.) in any dimension, each conductor shall be long
enough to extend at least 75 mm (3 in.) outside the opening.
NEC 300.14
Exception: Conductors that are not spliced or terminated at the
outlet, junction, or switch point shall not be required to comply
with 300.14.
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FPN: See Section 240.86(B) for tested series combination system.
5.5 OVERCURRENT PROTECTION (Fuses or Breakers):
5.5.1 The basic purpose of overcurrent protection is to open the circuit
before conductors or the conductor insulation are damaged when an
overcurrent condition occurs. An overcurrent condition can be the
result of an overload, ground fault, or a short circuit and must be
eliminated before the conductor insulation damage point is reached.
FPN: A current in excess of rating may be accommodated by
certain equipment and conductors for a given set of conditions.
Therefore, the rules for overcurrent protection are specific for
particular situations.
6.2 MECHANICAL AND ELECTRICAL CONTINUITY —
CONDUCTORS:
6.2.1 General: Conductors in raceways shall be continuous between
outlets, boxes, devices, and so forth. There shall be no splice or tap
within a raceway unless permitted by 300.15; 368.8(A); 376.56;
378.56; 384.56; 386.56; 388.56; or 390.6. NEC 300.13(A)
6.2.2 Device Removal: In multiwire branch circuits, the continuity of a
grounded conductor shall not depend on device connections such as
lamp holders, receptacles, and so forth, where the removal of such
devices would interrupt the continuity. NEC 300.13(B)
6.3 SPLICES:
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5.5.2 Overcurrent protection for conductors and equipment is provided to
open the circuit if the current reaches a value that will cause an
excessive or dangerous temperature in conductors or conductor
insulation. NEC 240.1
Definition of overcurrent: Any current in excess of the rated current
of equipment or the ampacity of a conductor. It may result from
overload, short circuit, or ground fault. NEC Article 100
6.3.1 Conductors shall be spliced or joined with splicing devices
identified for the use or by brazing, welding, or soldering with a
fusible metal or alloy. Soldered splices shall first be so spliced or
joined as to be mechanically and electrically secure without solder
and then soldered. All splices and joints and the free ends of
conductors shall be covered with insulation equivalent to that of the
conductors or with an insulating device identified for the purpose.
NEC 110.14(B)
Overcurrent protective devices, such as fuses and circuit breakers,
should be selected in a manner that ensures the short-circuit
withstand rating of the system components will not be exceeded
should a short circuit or high-level ground fault occur.
5.5.3 Used as Switches. Circuit breakers used as switches in
120-volt and 277-volt fluorescent lighting circuits shall be listed
and shall be marked SWD or HID. Circuit breaker used as switches
in high-intensity discharge lighting circuits shall be listed and shall
be marked as HID.
6.3.2 Where circuit conductors are spliced within a box, or terminated on
equipment within or supported by a box, any separate equipment
grounding conductors associated with those circuit conductors shall be
connected or joined within the box or to the box with devices suitable
for the use in accordance with NEC 250.148(A) through (E).
6.3.3 A box or conduit body shall be installed at each conductor splice,
connection point, outlet point, switch point, junction point,
termination point or pull point unless otherwise permitted in
NEC200.15(A) through (M).