Discussion Overview
The discussion revolves around determining the appropriate wire size for an electric trolley bus power supply, specifically focusing on the calculations needed for wire gauge based on voltage, current, and distance from the power source. The conversation includes theoretical considerations, practical applications, and calculations related to electrical wiring standards.
Discussion Character
- Technical explanation
- Mathematical reasoning
- Debate/contested
Main Points Raised
- One participant inquires about the wire size needed for a 15 Amp, 115 Volt appliance located 230 feet from the power source.
- Another participant suggests using an online wire gauge calculator but notes it is only for 24 volt equipment.
- Some participants mention typical household wiring sizes, suggesting AWG number 12 or 14, and reference various resources for wire gauge tables.
- One participant proposes using #8 copper or #6 aluminum wire, discussing the implications of using larger wire sizes with a 15-amp circuit breaker and receptacle, raising concerns about compliance with electrical codes.
- Another participant emphasizes the importance of allowing a maximum voltage drop of 5 volts in the circuit and provides a formula for calculating voltage drop, leading to a recommendation of #8 copper wire based on their calculations.
- There is a reiteration of the voltage drop calculation, confirming the recommendation of #8 or 8.0 sqmm wire, while noting that this calculation may not apply to large motors due to their higher starting current requirements.
- A later post expresses gratitude for the information received, indicating some level of understanding achieved.
- A new participant introduces a project on electric trolley buses, seeking guidance on calculating proper wire size for various AC and DC voltages, indicating ongoing exploration of the topic.
Areas of Agreement / Disagreement
Participants express multiple viewpoints regarding wire size recommendations and calculations, with no consensus reached on a single approach or solution. There are competing suggestions and calculations presented, indicating an unresolved discussion.
Contextual Notes
Some calculations depend on specific assumptions about voltage drop limits and wire material (copper vs. aluminum). The discussion also highlights potential regulatory considerations regarding electrical code compliance.
Who May Find This Useful
This discussion may be useful for electrical engineering students, professionals involved in electrical installations, and individuals working on projects related to electric vehicles or power supply systems.