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installation and work back toward the reel,
straightening as you go. Straighten by hand if
possible, do not use tools such as a hammer or
screwdriver, since this may deform the armor.
Although not required, forms made from pre-
formed PVC conduit bends cut in half may be
used as a guide when forming bends. Make
sure the minimum bend radius is observed.
Bend in small increments, do not try to make
the entire bend in one operation, shape into
final position gradually. When bending multiple
cables at the same place, shape the inner cable
and form the other cables to this one. This will
provide uniform curves. Do not leave long
lengths of cable in a manner that will subject
cable to point stresses. If a long length of cable
is left hanging coming off a ladder tray, the
cable may be damaged by the rung before con-
nection is completed.
Cables should not be held under tension after
installation and some slack is desirable in the
region of the terminations. In open installa-
tions, the cable must be adequately supported
to prevent undue strain on the cable and the
termination.
Cable Spacing
When multiple multi-conductor cables are used
in the same installation, they should be appro-
priately spaced for ampacity considerations
(generally one cable diameter apart minimum)
or appropriately derated for ampacity.
When multiple single conductor cables are
used, they may be laid flat, side by side as
close together as possible for all cables in the
same circuit. When properly designed, single
conductor cables may be spaced to increase
ampacity. Note, voltage drop should also be
evaluated. Multiple circuits should be appropri-
ately spaced for ampacity considerations, or
appropriately derated for ampacity. Consult
RSCC Engineering Depart ment for additional
design information.
For vertical support in raceway, call RSCC
Engineering Depart ment for recommendations.
Paralleling
Conductors to be joined in parallel should be
1/0 AWG or larger. See NEC Article 310.10(H)
or CEC as applicable.
The paralleled conductors in each phase, neu-
tral, or grounded circuit conductor shall
(1) Be the same length,
(2) Have the same conductor material,
(3) Be the same size in circular mil area,
(4) Have the same insulation type,
(5) Be terminated in the same manner.
Where conductors are used in parallel, space in
enclosures and termination points shall be
given consideration.
Where equipment grounding conductors are
used with parallel conductors, they shall be sized
per Article 250 of the NEC or CEC as applicable.
Induced Currents in Metal Enclosures or
Metal Raceways
Where conductors carrying alternating current
are installed in metal enclosures or metal race-
ways, they shall be arranged so as to avoid
heating the surrounding metal by induction. To
accomplish this, all phase conductors and,
where used, the grounded conductor and all
equipment grounding conductors shall be
grouped together.
Where a single conductor carrying alternating
current passes through metal with magnetic
properties, the inductive effect shall be minimized
by (1) cutting slots in the metal between the
individual holes through which the individual con-
ductors pass, or (2) passing all the conductors
in the circuit through an insulating wall suffi-
ciently large for all of the conductors of the circuit.
Pulling
Set up to pull as much of the cable as possible,
preferably the total length. Position sheaves
and pulling ropes, avoiding all obstructions so
the cable will move freely during the pulling
operation. Attach the pull rope to the cable by
suitable means. The armor should be fastened
