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NEC and CEC Tables

 

NEC and CEC Tables In DraftLogic Electrical Database

V9 2013/09/28

 

These tables from the NEC and CEC are referenced by DraftLogic Electrical when making calculations.  Client sites can opt to use different source columns that we ship with, we can supply a SQL script to quickly run to make such changes or those comfortable and confident in working directly in the database tables can edit that way.

CEC or other Canadian Data Source

DraftLogic Electrical Database Table(s) Populated Therefrom

45 - Single-phase ac motors

DraftLogic..DL_MOTOR_FULL_LOAD_AMP where PHASE=1, all voltages tracked including table noted extrapolation for 200V and 208V. [No changes for CEC 2012.]

44 - Three-phase ac motors

DraftLogic..DL_MOTOR_FULL_LOAD_AMP where PHASE=3, all voltages tracked including table noted extrapolation for 208V; using 'Induction type, squirrel cage and wound rotor' section only. [Many changes for CEC 2012, all have been committed; note only one set of values kept for all electrical systems, so NEC calcs are using the CEC 2012 numbers (vast majority same, only small differences).]

16 -Bonding Conductors

DraftLogic..DL_LT_BONDING_CONDUCTOR (CU CEC and AL CEC columns) [no changes for CEC 2012]

41 (was 17) -Grounding Conductors

DraftLogic..DL_LT_ GROUNDSIZE [changes committed for CEC 2011 due to change to Table 41 versus now deleted Table 17]

10A - Dimensions of cable for calculating conduit and tubing fill

DraftLogic..DL_LT_CONDUCTOR_SIZE; for CEC refer to columns CONDUCTOR_DIA_MM and CONDUCTOR_AREA_MM2 which have been filled from Table 10A first two columns (i.e. R90XLPE*, RW75XLPE*, RW90XLPE*  600 V) [no changes for CEC 2012]

Cross-sectional areas of conduit and tubing

NEC Table 4 Article 358 numbers for EMT for all sizes up to and including 4"; using CEC Table 9 for all sizes higher than 4"

DraftLogic..DL_LT_CONDUIT_SIZE [NEC 2011 has a number of conduit types listed, in our August 2012 V3.0.0.603 release we used the single set of CEC Table 4 numbers to apply to both CEC and NEC; CEC numbers close for FMC & RMC, but differ materially for 2.5" and higher for EMT & IMC.  In any release September 27, 2012 and later we have used the NEC Table 4 Article 358 numbers for EMT for both CEC and NEC since they match the 'Industry Standard EMT Dimensions'.]

Voltage Drop Formula and Supporting f and K factor tables from Canada Wire (supplied in 2010, no date on the pages)

DraftLogic..DL_LT_CONDUCTOR_SIZE columns: VDROP_CEC_CU90NOMAG (90% P.F. column in Copper Non-Mag. Conduit or Armour set of columns), VDROP_CEC_CU90MAG (90% P.F. column in Copper Magnetic Conduit or Armour set of columns),

VDROP_CEC_AL90NOMAG (90% P.F. column in Aluminum Non-Mag. Conduit or Armour set of columns), VDROP_CEC_AL90MAG (90% P.F. column in Aluminum Magnetic Conduit or Armour set of columns)

C value tables for Fault Level Calculations

Cooper Bussmann formula, modified slightly, and unmodified calculation factors used for both CEC and NEC.

DraftLogic..DL_LT_CONDUCTOR_SIZE, C_VAL_CU_600V_NONMAG & C_VAL_AL_600V_NONMAG columns. Verified same as Cooper Bussmann 2005 tables.  We are using the three single conductors nonmagnetic conduit 600V column for each of aluminum and copper conductors.

5A - Correction factors applying to Tables 1, 2, 3, and 4 (ampacity

correction factors for ambient temperatures above 30 °C)

DraftLogic..DL_LT_AMBIENT_TEMP (column with CEC in name); use 90 degree column [changes for CEC 2012 committed, they are now the same numbers as the 2011 NEC except don't have >1 correction factors for low temp like NEC does]

5C - Ampacity Correction Factors for Tables 2 and 4 (conductor counts)

DraftLogic..DL_LT_CONDUCTOR_COUNT_AMP_CORRECTION where STANDARD_TYPE_ID=1 [no changes for CEC 2012]

4 -Allowable Ampacities for <= 3 AL Conductors, using 90 degree column [as of Sept 2013 release, using 75 degree column and 140104(2) exceptions for #12/#10]

DraftLogic.. DL_FEEDER_SIZE where CONDUCTOR_TYPE=2 and AMPACITY_TYPE=RW90 [many changes for CEC 2012, all have been committed]

6 - Maximum number of conductors of one size in trade sizes of conduit or tubing

DraftLogic..DL_CONDUIT_CONDUCTOR_COUNT, CONDUCTOR_COUNT_MAX column for CEC values. [no changes for CEC 2012 other than to add all missing entries for 450MCM]

We are transitioning between using this table and completely calculating conduit fill using conduit and cable cross-sectional area.

2 -Allowable Ampacities for Not More than 3 Copper Conductors, using 90 degree column [as of Sept 2013 release, using 75 degree column and 140104(2) exceptions for #14/#12/#10]

DraftLogic.. DL_FEEDER_SIZE where CONDUCTOR_TYPE=1 and AMPACITY_TYPE=RW90 [many changes for CEC 2012, all have been committed]

 

 

NEC Table or other US Data Source

DraftLogic Electrical Database Table(s) Populated Therefrom

430.52 -Motor Protection % of FLA

Hardcoded into motor calculations.  We are assuming all fuses are time delay and all breakers are inverse time delay.  Also assuming all motors are of types that would thus receive 175% fuses and 250% breakers.  [No change for NEC2011]

430.248 -Full-Load Current in Amperes, Single-Phase Alternating-Current Motors

DraftLogic..DL_MOTOR_FULL_LOAD_AMP where PHASE=1 [NEC 2011 and CEC 2012 match pretty close, some minor differences; have used CEC 2012 where conflict]

430.250 -Full-Load Current, Three-Phase Alternating-Current Motors (Induction Type columns only)

DraftLogic..DL_MOTOR_FULL_LOAD_AMP where PHASE=3 [NEC 2011 and CEC 2012 match pretty close, some minor differences; have used CEC 2012 where conflict; also note wider coverage of CEC 2012]

4 -Dimensions and Percent Area of Conduit and Tubing

NEC Table 4 Article 358 numbers for EMT for all sizes up to and including 4"; using CEC Table 9 for all sizes higher than 4"

DraftLogic..DL_LT_CONDUIT_SIZE [NEC 2011 has a number of conduit types listed, in our August 2012 V3.0.0.603 release we used the single set of CEC Table 4 numbers to apply to both CEC and NEC; CEC numbers close for FMC & RMC, but differ materially for 2.5" and higher for EMT & IMC.  In any release September 27, 2012 and later we have used the NEC Table 4 Article 358 numbers for EMT for both CEC and NEC since they match the 'Industry Standard EMT Dimensions'.]

5 -Dimensions of Insulated Conductors and Fixture Wires

DraftLogic..DL_LT_CONDUCTOR_SIZE; for NEC refer to four columns with NEC in name (CONDUCTOR_DIA_NEC_MM_CU, CONDUCTOR_AREA_MM2_NEC_CU, CONDUCTOR_DIA_NEC_MM_AL, CONDUCTOR_AREA_MM2_NEC_A)

Copper: where TYPE=THHN from table

Aluminum: where TYPE=XHHW from table

[no changes for NEC 2011]

9- Alternating Current Resistance and Reactance for 600-Volt Cables, 3-Phase, 60 Hz, 75 degrees C -- Three Single Conductors in Conduit

Used for K factors

Formula and f factors from Canada Wire 2001

DraftLogic..DL_LT_CONDUCTOR_SIZE columns: VDROP_NEC_CU90NOMAG (PVC Conduit column), VDROP_NEC_CU90MAG (Steel Conduit column),

[these two CU columns from 'Effective Z at 0.85 PF for uncoated Copper Wires' set of columns]

VDROP_NEC_AL90NOMAG (PVC Conduit column), VDROP_NEC_AL90MAG (Steel Conduit column) 

[these two AL columns from 'Effective Z at 0.85 PF for Aluminum Wires' set of columns]

 

C value tables for Fault Level Calculations

Cooper Bussmann formula, modified slightly, and unmodified calculation factors used for both CEC and NEC.

DraftLogic..DL_LT_CONDUCTOR_SIZE, C_VAL_CU_600V_NONMAG & C_VAL_AL_600V_NONMAG columns. Verified same as Cooper Bussmann 2005 tables.  We are using the three single conductors nonmagnetic conduit 600V column for each of aluminum and copper conductors.

250.122 -Minimum Size Equipment Grounding Conductors for Grounding Raceway and Equipment

DraftLogic..DL_LT_BONDING_CONDUCTOR (CU NEC and AL NEC columns) [one change committed for NEC 2011]; also using this same table to populate NEC AL and CU columns in DraftLogic..DL_LT_ GROUNDSIZE [many changes committed for NEC 2011]

310.15(B)(16) [formerly 310.16] -Allowable Ampacities of Insulated Conductors, using 75 degree columns for each of CU and AL

Copper: DraftLogic.. DL_FEEDER_SIZE where CONDUCTOR_TYPE=1 and AMPACITY_TYPE=THHN

Aluminum: DraftLogic.. DL_FEEDER_SIZE where CONDUCTOR_TYPE=2 and AMPACITY_TYPE=XHHW

[Committed changes for NECV 2011, only ones were where we had not applied the effects of section 240.4(D) on the smallest 3 CU and smallest 2 AL conductors.]

 

310.15(B)(3)(a) -Adjustment Factors for >3 Current Carrying Conductors in a Raceway or Cable

DraftLogic..DL_LT_CONDUCTOR_COUNT_AMP_CORRECTION where STANDARD_TYPE_ID=2 [No changes for NEC 2011]

310.15(B)(2)(a) Ambient Temperature Correction Factors Based on 30 degrees C (86 degrees F)

DraftLogic..DL_LT_AMBIENT_TEMP (column with NEC in name); use 90 degree column [changes for NEC 2011 committed]