Guiomar Field Electrical Tools

GUIOMAR Field Electrical Tools is a professional electrical calculator app designed specifically for Ontario electricians working with the Ontario Electrical Safety Code (OESC) 2024.

Built by an electrician for electricians - this app delivers fast, accurate calculations right at the job site. No internet required. No subscription. No fluff.

WIRE SIZE CALCULATOR

• Wire sizing based on OESC Table 2 and Table 4
• Copper and aluminum conductors
• Multiple temperature ratings (60C, 75C, 90C)
• Derating factors for temperature and conduit fill
• Clear next size up recommendations

VOLTAGE DROP CALCULATOR

• DC, Single Phase, and Three Phase systems
• OESC Appendix D3 compliant calculations
• Parallel conductor support
• Power factor adjustment
• 3% and 5% threshold indicators

CONDUIT FILL CALCULATOR

• OESC Table 6 and 9 wire areas
• All raceway types (EMT, PVC, Rigid)
• Mixed wire sizes supported
• 40% fill limit compliance
• Instant minimum trade size recommendations

BONDING CONDUCTOR CALCULATOR

• OESC Table 16 lookups
• Overcurrent protection device sizing
• Copper and aluminum bonding conductors
• Clear code reference citations

WHY GUIOMAR?

• 100% OFFLINE - Works in basements, mechanical rooms, anywhere
• OESC 2024 COMPLIANT - Accurate to current Ontario standards
• FAST - Get answers in seconds, not minutes
• PROFESSIONAL - Clean interface designed for field use
• NO ADS - Focus on your work, not interruptions

Calculations are based on OESC 2024 tables and formulas. Always verify results against the Ontario Electrical Safety Code and consult with the Electrical Safety Authority (ESA) for code interpretations.

The app is currently offered for free. Pricing and availability may vary by region and may change in the future.