AMPLIFY VOLT — Calculate voltage drop, short-circuit current, ampacity & conduit sizing per Canadian Electrical Code CSA C22.1:2024. Free for electricians and engineers.
⚡
Auto Cable & Conduit Sizing
Minimum cable auto-selected for ampacity + VD budget. Conduit sized by CEC fill calculations.
🔗
Multi-Segment VD Analysis
Define nodes in the Node Manager, then pick any route in the Calculator tab.
Information Purposes Only — Verify All Calculations
This calculator is provided as an engineering reference tool for information purposes only. Results are not a sealed engineering document and shall not be relied upon for permit submission, tendering, construction, or any other regulated purpose without independent verification. All calculations must be reviewed, verified, and sealed by a licensed Professional Engineer (P.Eng.) or Master Electrician authorized to practice in the project jurisdiction. Neither the author, I&R Associates, nor Amplify Design Consulting accepts any liability for errors, omissions, misuse, or consequences arising from use of this tool. Use at your own risk.
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Node Manager
Define all nodes (transformer, panels, disconnects). Configure system settings below, then go to Segment Analysis to wire them up.
💡 Tip: Click a node name to rename it. The + button instantly adds a segment in the Segment Analysis tab. The first node (⚡ Source) is the transformer.
⚡ System Configuration
Phase · Voltage · VD Limits · Cable Rules · Transformer — applies to all segments
≥60A feeder → AL | <60A / small size → CU
Auto: optimizer picks cable & sets | Manual: you pick, calcs still validate
🎯 VD Design Targets
Flat: your design target applies equally to all feeder/panel/meter-stack nodes. Recommended for most projects.
⚡ Auto-solve will prefer parallel sets over exceeding these per-set limits.
e.g. 400A in raceway → 2×350 MCM AL instead of 1×1000 MCM AL.
Indoor pulls, tight bends
Duct bank pulling
Pulling machines available
No bending constraints
CEC Table 36 AAC sizes
🏭 Source Configuration (for SCCR)
Utility transformer — ISC from kVA and Z% impedance
⚡ Utility Transformer
🔌 Generator / Genset
Standby kVA (not kW)
From alternator data sheet
Always verify with manufacturer
⚠ Request full alternator data from your dealer — specifically Xd", Xd', X0, X2 and time constants. Typical Xd": small (30-100kW) 15-25% · medium (150-500kW) 12-20% · large (750kW+) 10-15%.
🔄 Automatic Transfer Switch — Calculator uses the higher ISC (worst case) of the two sources for equipment AIC rating. Utility typically produces higher ISC than generator.
Per CEC Rule 10-114(1): Minimum #6 AWG copper or #4 AWG aluminum for services up to 200A.
✅
CEC Rule 8-102 Compliance — Node Status
Cumulative VD from Transformer to each node. Feeder 3% vs Branch/Load 5%
Node
Type
Cumulative VD%
Targets ▶Design ⚠Warn ✗Fail
Status
Rule
📋
Feeder Notes for Drawings
Auto-generated — copy directly into drawing callouts
Toggle note content ↑
Format: [Amps] [Sets]-[Size] [Material] C/W [Ground] [Material] GRND IN [Conduit] OR EQUAL [VD%]
⚠️
Engineering Reference Only. Verify with a Professional Engineer or Master Electrician. CEC CSA C22.1:2024. Bussmann P2P per Eaton Bussmann Short-Circuit Guide. | amplifydesign.ca
🏠 Suite Feeder Schedule Generator
Auto-generates voltage-drop-limited cable schedule for multi-unit residential suite feeders.
Standalone tool — no project setup required.
🏠 Suite Feeder Schedule Generator
Auto-calculates max feeder length per conductor size at your demand current
CEC Classification: Meter Stack → Suite Panel = FEEDER (CEC Rule 8-102 — 3% max cumulative).
Suite Panel → Outlets = BRANCH (remaining budget to 5% total).
VD budget split: feeder consumes budget from source, branch gets whatever remains.
This value appears on the drawing note only. The schedule math is based on the design current (panel × demand factor), not the breaker size. Cable lug fit to be verified against the specified meter stack supplier.
(Optional) Flags cables that MAY exceed typical panelboard plug-on breaker lug ranges.
Meter stack breakers often have looser lug ranges — verify with supplier.
Design Current
67A
VD calculated on this
Max VD Allowed
4.16V
2% × 208V
Feeder Breaker
70A
Next standard above demand
About AMPLIFY VOLT — A Proudly Canadian Electrical Code Calculator
AMPLIFY VOLT is a free voltage drop and short-circuit current calculator built for the
Canadian Electrical Code (CEC) CSA C22.1:2024. It is designed for electricians, electrical
engineers, electrical designers, and contractors working on residential, commercial, and
institutional projects across Canada. The tool covers voltage drop calculation using CEC
Table D5, SCCR analysis using the Bussmann Point-to-Point (P2P) method, ampacity lookup
from CEC Tables 2 and 4, conduit fill sizing per CEC Table 8, bonding conductor sizing
per Rule 10-616, and grounding electrode conductor (GEC) sizing per Rule 10-114.
The Suite Feeder Schedule Generator automatically calculates maximum wiring lengths for
each conductor size at a given design current, voltage, and voltage drop budget. It
produces copy-paste drawing notes formatted for multi-unit residential projects — matching
the standard Alberta drafting convention used by electrical engineering firms. Copper and
aluminum options are paired at +2 AWG (e.g., #4 CU with #2 AL) based on the resistivity
ratio between the two materials.
This calculator was designed by Ibrar, P.Eng. (APEGA), and is published by I&R Associates,
an electrical engineering consultancy based in Calgary, Alberta. It is offered free of charge
as a contribution to the Canadian electrical trade community. No signup, no ads, no tracking.
All results must be verified by a licensed Professional Engineer before use in permit
submissions or construction.
❓ Frequently Asked Questions
AMPLIFY VOLT/SCCR Calculator · 15 common questions from electricians and engineers
Basics
1. Is this calculator free?
Yes, completely free for any use — residential, commercial, institutional. No accounts, no tracking, no ads, no paywalls.
2. Which Canadian Electrical Code edition does this use?
CSA C22.1:2024 (CEC 25th Edition). References include Tables 2, 4, 5A, 5C, 6A, 16, D5, D8A/B, D9A/B, D10A/B, D11A/B, and 36A/B. All 2,793 data cells have been verified against the official CEC 2024 PDF.
3. Can I use results directly for permit drawings?
This is an engineering reference tool only. All results must be independently verified and sealed by a licensed P.Eng. (or Master Electrician, where permitted) before permit submission, tendering, or construction.
4. Who designed this calculator?
Ibrar, P.Eng. (APEGA) of I&R Associates, Calgary Alberta. Built as a free contribution to the electrical engineering and trade community across Canada.
Voltage Drop Methodology
5. What formula does this calculator use for voltage drop?
Standard CEC Appendix D formula: VD = (P × K × L × I) / CM
Where P = 1.732 for 3-phase or 2 for single-phase, K = conductor resistivity at 75°C, L = one-way length in feet, I = current in amps, CM = conductor cross-section in circular mils (from CEC Table D5, mm² × 1973.5).
Default is 75°C because CEC Rule 4-006 requires design based on the 75°C termination temperature for most breakers, and loaded feeders actually operate near this temperature. Using cold (20°C) K values would underestimate voltage drop by ~15-20% on loaded conductors.
7. Why do online calculators sometimes give different numbers?
Common differences: (a) they use cold-conductor K values (~17 Al, ~10.8 Cu) instead of 75°C operating K; (b) they report %VD on 120V phase-to-neutral instead of 208V line-to-line for 3-phase feeders; (c) they omit the √3 factor for balanced 3-phase circuits. This calculator follows CEC Appendix D methodology — the results are CEC-defensible.
8. Why is VD calculated on 208V (not 120V) for a 3-phase feeder?
For a 3-phase 4-wire feeder, the engineering-relevant voltage is line-to-line (208V for a 120/208V system), not line-to-neutral. %VD reported against 208V reflects the actual voltage variation that downstream panels see. Reporting %VD on 120V makes drops look artificially larger and is incorrect for balanced 3-phase feeder sizing.
Code Compliance
9. How is SCCR calculated?
Using the Bussmann Point-to-Point (P2P) method from Eaton's Short-Circuit Current Rating Guide. Formula: f = (P × L × Iₛc_in) / (C × n × V), M = 1/(1+f), Iₛc_out = Iₛc_in × M. Motor contribution is added flat at each fault point per Bussmann Note 4, not cascaded. This is the standard method referenced by CEC Rule 14-012 for AIC coordination.
10. Why do my bonding conductor sizes match Table 16?
Bond sizing follows CEC Rule 10-616 and Table 16, based on the largest overcurrent protective device ampacity in the circuit. For parallel runs, each raceway must contain a bond conductor sized for the full breaker rating per Rule 10-808. All 38 bond values (Cu and Al) have been verified against CEC Table 16.
11. What's the VD budget split (3%/2% or 2%/3%)?
CEC Rule 8-102 limits total VD to 5% from service to point of use. The split between feeder and branch is the designer's choice. Common practice: 3% feeder + 2% branch (when branch runs are short) or 2% feeder + 3% branch (when branch runs are long). Both are legal — document your chosen split in the calculation basis.
Practical Use
12. Can I share this with electricians and contractors?
Yes, please do. Share the URL (calculator.amplifydesign.ca) freely. The tool is designed to settle disputes between engineers, contractors, and electricians by providing a transparent, CEC-verified calculation that everyone can reproduce.
13. How do I handle parallel conductor runs?
Set the "parallel sets" field to the number of parallel runs per phase. The calculator divides current per conductor, and multiplies effective CM by the number of sets for VD purposes. CEC Rule 12-108 requires parallel conductors to be 1/0 AWG or larger, same size, same material, same length, and same termination method.
14. Does this handle power factor (PF < 1.0)?
The calculator assumes resistive load (PF = 1.0). For motor-dominated or VFD loads with PF < 0.85, additional reactive drop using effective impedance tables may be warranted. For typical residential/commercial lighting and receptacle loads, PF is close enough to 1.0 that this is not a significant concern.
15. I found a bug or have a suggestion.
Email [email protected] with the input values and expected vs actual output. Feedback is welcome, but the tool is provided as-is with no guaranteed support or response time.
CEC CSA C22.1:2024 · Bussmann P2P Method · 2,793 data cells verified against CEC 2024 PDF
📖 How to Use This Calculator
Step-by-step guide — takes about 2 minutes to learn
Quick overview — 4 simple steps
1. Add nodes (transformer, panels, meter stacks) →
2. Wire segments between them →
3. Check results →
4. Download PDF
1
Project Setup — define your nodes
Go to the ⚡ Project Setup tab. This is where you describe your building's electrical topology.
a) Set your system voltage (usually 208V 3-phase for multi-unit residential, or 120/240V 1-phase for houses).
b) Set your transformer: kVA rating, impedance %Z (ENMAX pad-mount = typically 3.5%Z for 500 kVA).
c) Add your nodes using the + button. Each node is a physical panel, disconnect, or meter stack:
MDP — Main Distribution Panel (usually right after the service disconnect)
CDP — Commercial Distribution Panel (for house loads, parking, etc.)
Meter Stack — typically 200A or 400A serving multiple suites
Suite Panel / House Panel / Comm Panel — end-use panels
d) Click a node name to rename it (MS1, MS2, MS3 for each meter stack).
2
Segment Analysis — wire the nodes together
Go to the 📐 Segment Analysis tab. Each segment is a feeder or sub-feeder between two nodes.
a) Pick From → To nodes. For example: Transformer → MDP, MDP → MS1, CDP → House Panel.
b) Enter length in feet (one-way distance from source to destination).
c) Enter load current in amps (the calculated or breaker-sized demand).
d) Choose install method: Raceway (T2/T4), Underground Duct Bank (D11), Direct Buried (D8), U/G PVC Raceway (D9), Free Air (T1/T3), Aerial NSC (T36).
e) Material: Copper or Aluminum (Al is typical for feeders above 100A).
f) Parallel sets: how many parallel runs per phase (1 for single run, 2 for parallel, up to 10).
g) Cable size: Leave on "Auto" and the calculator picks the smallest cable meeting ampacity + VD budget. Or override with a specific size if you want to check a contractor's proposed design.
3
Review results & verify code compliance
Go to the 📊 Results & Reports tab. You'll see:
VD summary — max feeder drop, max total drop, lowest voltage at any load
Per-segment VD — voltage drop, percentage, and cumulative % at each node
SCCR analysis — Bussmann P2P method, available fault current at every point (CEC Rule 14-012)
Bonding schedule — per CEC Table 16 / Rule 10-616
GEC sizing — per CEC Rule 10-114
Feeder notes — ready to copy onto your drawings (e.g. 400A: 2 SETS OF 4-350 MCM AL & 2-#1 CU BOND IN 2-4"C)
Look for the ✓ PASS badge. If you see ⚠ WARN or ✗ FAIL, the segment exceeds design or code limits — go back and upsize the cable or shorten the run.
4
Export PDF / CSV
At the top of the Results tab you'll find:
📄 Download PDF Report — professional report with firm branding, ready to attach to your engineering submission
📊 Export CSV — raw data for Excel review or custom formatting
The PDF includes all segments, VD, SCCR, bonding, GEC, feeder notes for drawings, and a full disclaimer. Firm color and logo change automatically based on the "Firm Name" field in Project Setup.
🏠 Bonus: Suite Feeder Schedule (for multi-unit residential)
The 🏠 Suite Feeder Schedule tab auto-generates a wire-by-wire schedule for every suite in your building. Enter the number of suites, their load type (100A single-phase or 200A 3-phase), and the distance from the meter stack. Output is a full table with cable size, breaker size, and conduit — ready for drawings and permit submission.
Common use cases
🏢 Multi-unit apartment
Main service → MDP → multiple meter stacks → suite panels. Use all 4 tabs.
🏘 Single-family house
Transformer → Service → Main Panel. Only a few segments needed.
🏪 Commercial TI
Existing service → New subpanel → Equipment loads. Check VD to ensure compliance.
⚡ Verifying contractor calcs
Enter the contractor's proposed cable sizes and see VD/SCCR. Use for design reviews and coordination.
💡 Pro tips
Use Auto-size cable as a starting point, then override manually if you need to match a contractor's proposal or field-available stock.
VD budgets are configurable: common splits are 3% feeder + 2% branch, or 2% feeder + 3% branch. Both legal under CEC 8-102 (5% total).
For 3-phase systems, %VD is calculated on 208V line-to-line, not 120V. Don't let online estimators confuse you — see FAQ Q8.
K values default to 75°C (Cu=12.3, Al=20.6). This reflects real operating temperatures of loaded conductors. See FAQ Q6.
SCCR uses Bussmann Point-to-Point — motor contribution added flat at each point, not cascaded (Bussmann Note 4).
CEC CSA C22.1:2024 · Bussmann P2P Method · Designed by Ibrar, P.Eng. (APEGA)
Contact I&R Associates
Professional electrical engineering services
We provide electrical engineering design for multi-unit residential,
commercial, and institutional projects in Alberta.
Mechanical coordination available through partner firms. Services include load
calculations, single-line diagrams, fire alarm systems (CAN/ULC-S524, S536),
and code compliance review.
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