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vault backup: 2026-04-16 17:07:54

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Zane Meyers
2026-04-16 17:07:54 -04:00
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nfpa-70_300_general-requirements.md
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@@ -714,7 +714,7 @@ Intermediate supports shall be provided
as necessary to limit supported conductor lengths
to not greater than those values specified in Table 300.19(A).
#### Table 300.19(A) Spacings for Conductor Supports ^t300-19a
#### Table 300.19(A) Spacings for Conductor Supports
| Conductor Size | Aluminum or Copper-Clad Aluminum | Copper |
| -------------------------------- | --------------------------------:| ------:|
@@ -731,33 +731,31 @@ to not greater than those values specified in Table 300.19(A).
Support methods and spacing intervals for fire-rated cables and conductors
shall comply with any restrictions provided in the listing
of the electrical circuit protective system used
and in no case shall exceed the values in [[#^t300-19a|Table 300.19(A)]].
and in no case shall exceed the values in [[#Table 300.19(A) Spacings for Conductor Supports|Table 300.19(A)]].
#### 300.19(C) Support Methods.
One of the following methods of support shall be used:
1. Clamping devices constructed of or employing insulating wedges
inserted in the ends of the raceways.
Where clamping of insulation does not adequately support the cable,
the conductor also shall be clamped.
inserted in the ends of the raceways.
Where clamping of insulation does not adequately support the cable,
the conductor also shall be clamped.
2. Inserting boxes at the required intervals
in which insulating supports are installed and secured
in an approved manner to withstand the weight of the conductors attached thereto,
the boxes being provided with covers.
in which insulating supports are installed and secured
in an approved manner to withstand the weight of the conductors attached thereto,
the boxes being provided with covers.
3. In junction boxes, deflecting the cables not less than 90 degrees
and carrying them horizontally to a distance not less than twice the diameter of the cable,
the cables being carried on two or more insulating supports
and additionally secured thereto by tie wires, if desired.
Where this method is used, cables shall be supported at intervals
not greater than 20 percent of the support spacing in [[#^t300-19a|Table 300.19(A)]].
and carrying them horizontally to a distance not less than twice the diameter of the cable,
the cables being carried on two or more insulating supports
and additionally secured thereto by tie wires, if desired.
Where this method is used, cables shall be supported at intervals
not greater than 20 percent of the support spacing in [[#Table 300.19(A) Spacings for Conductor Supports|Table 300.19(A)]].
4. Other approved means.
%% TODO: TEXT OMITTED %%
### 300.20 Induced Currents in Ferrous Metal Enclosures or Ferrous Metal Raceways.
#### 300.20(A) Conductors Grouped Together.