Art 310 Conductors

8/12/2019 Art 310 Conductors

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Article 310. Conductors forArticle 310. Conductors for

General WiringGeneral Wiring

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Article 310 contains the generalArticle 310 contains the general

requirements for conductors, such asrequirements for conductors, such as

insulation markings, ampacity ratings, andinsulation markings, ampacity ratings, and

their use.their use.

310.1 Scope310.1 Scope

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his article doesn!t apply to conductors thathis article doesn!t apply to conductors that

are an integral part of electricalare an integral part of electrical

equipment.equipment.

310.1 Scope310.1 Scope

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"A# $nsulated."A# $nsulated.

310.% Conductors310.% Conductors

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310.3 Stranded Conductors310.3 Stranded Conductors

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310.& Conductors in 'arallel310.& Conductors in 'arallel

"A# General. (ngrounded and neutral"A# General. (ngrounded and neutral

conductors 1)0 AWG and larger canconductors 1)0 AWG and larger can

paralleled.paralleled.

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"*# Conductor Characteristics."*# Conductor Characteristics.

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"C# Separate +aceays or Ca-les."C# Separate +aceays or Ca-les.

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310. /ocation310. /ocation

"# /ocations 2posed to irect Sunlight."# /ocations 2posed to irect Sunlight.

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310.1% Conductor $dentification310.1% Conductor $dentification

"C# (ngrounded Conductors."C# (ngrounded Conductors.

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310.13 Conductor Construction310.13 Conductor Construction

%% 405C in et locations405C in et locations

6o 76o 7 805C insulation rating805C insulation rating

77 9:5C insulation rating9:5C insulation rating

7777 405C insulation rating405C insulation rating

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310.13 Conductor Construction310.13 Conductor Construction

66 6ylon outer co;er6ylon outer co;er

++ hermoset insulationhermoset insulation

hermoplastic insulationhermoplastic insulation

(( (nderground(nderground

WW Wet or damp locationsWet or damp locations


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310.1: Conductor Ampacity310.1: Conductor Ampacity

"A# General +equirements"A# General +equirements

"%# Conductor Ampacity. $f a single length of"%# Conductor Ampacity. $f a single length of

conductor has to ampacities, the loerconductor has to ampacities, the loer

ampacity must -e used for the entireampacity must -e used for the entire

circuit.circuit.

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"*# Ampacity a-le."*# Ampacity a-le.

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"%# Ampacity Ad=ustment"%# Ampacity Ad=ustment

"a# Conductor *undle. Where the num-er of"a# Conductor *undle. Where the num-er of

currentcarrying conductors in a raceaycurrentcarrying conductors in a raceay

or ca-le e2ceeds three, the alloa-leor ca-le e2ceeds three, the alloa-leampacity of each conductor must -eampacity of each conductor must -e

ad=usted.ad=usted.


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"a# Conductor *undle."a# Conductor *undle.

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"c# +aceays 2posed to Sunlight on"c# +aceays 2posed to Sunlight on+ooftops. emperature ;alues in a-le+ooftops. emperature ;alues in a-le310.1:"*#"%#"c# are added to the outdoor310.1:"*#"%#"c# are added to the outdooram-ient temperature for conductors inam-ient temperature for conductors inraceays on or a-o;e rooftops.raceays on or a-o;e rooftops.


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0 to 1>% in.0 to 1>% in. 805?805?

A-o;e 1>% in. to 3 1>% in.A-o;e 1>% in. to 3 1>% in. &05?&05?

A-o;e 3 1>% in. to 1% in.A-o;e 3 1>% in. to 1% in. 305?305?

A-o;e 1% in. to 38 in.A-o;e 1% in. to 38 in. %:5?%:5?

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" 6eutral Conductor" 6eutral Conductor

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"8# elling (nit ?eeder)Ser;ice"8# elling (nit ?eeder)Ser;ice

Conductors.Conductors.

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What si@e ser;ice conductors are required ifWhat si@e ser;ice conductors are required if

the calculated load for a delling unitthe calculated load for a delling unit

equals 14:A, and the ma2imumequals 14:A, and the ma2imum

un-alanced neutral load is 100Aun-alanced neutral load is 100A

Art 310 Conductors

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