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shall be installed complete between outlet, junction,
or splicing points prior to the installation of conductors.
Where required to facilitate the installation of
utilization equipment, the raceway shall be permitted
to be initially installed without a terminating connection
at the equipment. Prewired raceway assemblies shall
be permitted only where specifically permitted in this
Code for the applicable wiring method.
300.19 Supporting Conductors in Vertical Raceways.
(A) Spacing Intervals – Maximum. Conductors in vertical
raceways shall be supported if the vertical rise exceeds
the values in Table 300.19(A). One cable support shall
be provided at the top of the vertical raceway or as
close to the top as practical. Intermediate supports
shall be provided as necessary to limit supported
conductor lengths to not greater than those values
specified in Table 300.19(A).
Exception: Steel wire armor cable shall be supported at
the top of the riser with a cable support that clamps the
steel wire armor. A safety device shall be permitted at the
lower end of the riser to hold the cable in the event there
is slippage of the cable in the wire-armored cable support.
Additional wedge-type supports shall be permitted to
relieve the strain on the equipment terminals caused by
expansion of the cable under load.
TABLE 300.19(A). SPACINGS FOR CONDUCTOR
SUPPORTS
CONDUCTORS
Support of Aluminum or
Conductors Copper-Clad
in Vertical Aluminum Copper
Size of Wire Raceways m ft m ft
18 AWG through Not greater than 30 100 30 100
8 AWG
6 AWG through Not greater than 60 200 30 100
1/0 AWG
2/0 AWG through Not greater than 55 180 25 80
4/0 AWG
Over 4/0 AWG Not greater than 41 135 18 60
through 350 kcmil
Over 350 kcmil Not greater than 36 120 15 50
through 500 kcmil
Over 500 kcmil Not greater than 28 95 12 40
through 750 kcmil
Over 750 kcmil Not greater than 26 85 11 35