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Calculation No.: Calc-001
Revision: A
Description:
Created By: Engineer Name
Project: Project Name
Project No.: P001
Client: Client Name

CEC 2024 Cable Sizing

Balanced 60 Hz three-phase LV reference calculation to CSA C22.1:24. Provincial and territorial amendments are excluded. This report is a reference aid, not the Code. A conductor is correctly sized only when it satisfies ampacity, termination, voltage drop and protection together; the governing size is the largest any one check demands.

Load and Design Current

Rule 8-104: continuous loads on 80%-rated equipment carry a 125% conductor uplift. Motor running current is selected from CEC Table 44; a single motor's conductor demand is 125% of FLC (Rule 28-106) and a feeder uses 125% of the largest motor plus the rest (Rule 28-108).

Formula: $$I = \frac{P}{\sqrt{3}V\cos\phi}\quad\text{or}\quad I = \frac{S}{\sqrt{3}V}$$
Substitution: $$I = \frac{100 \times 1000}{\sqrt{3} \times 600 \times 0.9}$$
Result: Load 106.92 A; design 133.65 A

Corrected Ampacity (Rule 4-004, Tables 5A and 5C)

3 current-carrying conductors per raceway. The per-conductor ampacity is the lesser of the corrected insulation-column value and the termination-column value.

Formula: $$I_{corr} = I_{base} \times k_{ambient} \times k_{grouping}$$
Substitution: $$I_{corr} = 170 \times 1.00 \times 1.00$$
Result: 170.00 A corrected; 150.00 A termination cap (Rule 4-006); 150.00 A per conductor

Voltage Drop (Rule 8-102)

L is the one-way length in km with equal current sharing between parallel runs. Maximum run at this current: about 228 m.

Formula: $$V_d = \sqrt{3}\, I\, L\, (R\cos\phi + X\sin\phi)$$
Substitution: $$V_d = \sqrt{3} \times 106.92 \times 0.0500 \times (0.4379 \times 0.90 + 0.0749 \times 0.436)$$
Result: 3.95 V = 0.66% (limit 3%); total to utilization 0.66% (limit 5%)
Parameter Symbol Value Notes
OCPD target 133.65 Design current
OCPD standard rating 150 Table 13
Motor running overload — Not applicable
Bonding conductor 6 Table 16 from OCPD rating; 1 × Cu
Parameter Symbol Value Notes
Status PASS
Phase conductor 1/0
Equal parallel runs 1 Maximum search: six
Total allowable ampacity 150.00 After correction and termination cap
Voltage drop 0.66 Limit 3%
Total voltage drop 0.66 Limit 5% to the point of utilization
OCPD 150 A CEC standard rating
Bonding conductor 6 Quantity 1
Governing criterion ampacity
Parameter Symbol Value Notes
1 × 14 FAIL ampacity, voltage_drop, total_voltage_drop, ocpd_coordination, small_conductor_limit
1 × 12 FAIL ampacity, voltage_drop, total_voltage_drop, ocpd_coordination, small_conductor_limit
1 × 10 FAIL ampacity, voltage_drop, total_voltage_drop, ocpd_coordination, small_conductor_limit
1 × 8 FAIL ampacity, voltage_drop, ocpd_coordination
1 × 6 FAIL ampacity, ocpd_coordination
1 × 4 FAIL ampacity, ocpd_coordination
1 × 3 FAIL ampacity, ocpd_coordination
1 × 2 FAIL ampacity, ocpd_coordination
1 × 1 FAIL ampacity, ocpd_coordination
1 × 1/0 PASS All checks passed
Parameter Symbol Value Notes
1 The termination-temperature ampacity cap governs the selected conductor.
2 Voltage-drop impedance uses a cross-standard AS/NZS 3008:2017 proxy; confirm suitability for the actual Canadian cable construction and arrangement.
Parameter Symbol Value Notes
CEC_T5A 30 90 C insulation ambient correction; 30 C unity row derived from table basis
CEC_T13 150 Standard OCPD ratings transposed from supplied conductor-range table
CEC_RULES Cu Draft parallel-conductor minimum by material; estimated pending licensed CEC 2024 verification
CEC_RULES maximum Draft next-standard-size OCPD boundary; estimated pending licensed CEC 2024 verification
CEC_T2 1/0 90 C ampacity; user-supplied CEC 2025 CSV
CEC_T2 1/0 75 C ampacity; user-supplied CEC 2025 CSV
CEC_T5C 3 Grouping correction; 1000000 represents supplied '43 and up' range
CEC_RX 1/0 [PROXY] AS3008:2017 Table 35 col 4014; 75C R/XLPE X; multicore circular; AWG log-area interpolation/extrapolation; ohm/km
CEC_RX 1/0 [PROXY] AS3008:2017 Table 30 col 2009; 75C R/XLPE X; multicore circular; AWG log-area interpolation/extrapolation; ohm/km
CEC_RULES 1/0 Draft Cu general small-conductor caps; 6000 A means no additional draft cap; verify before use
CEC_T16 200 Bonding conductor size, Cu; OCR zero notation normalized to n/0

Diagram

Created By
Engineer Name
Date: ..........................
Checked
By: .............................
Date: ..........................
Approved
By: .............................
Date: ..........................
Client Approved
By: .............................
Date: ..........................