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Unread 20-01-2003, 14:29
Unsung FIRST Hero
Al Skierkiewicz Al Skierkiewicz is offline
Broadcast Eng/Chief Robot Inspector
AKA: Big Al WFFA 2005
FRC #0111 (WildStang)
Team Role: Engineer
 
Join Date: Jun 2001
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viper,
The current rating on #6 wire is based on it's capabilities in free air and according to National Electrical Code it is capable of 105 Amps continuous for THHN type wire. Part of this spec is that the insulating jacket will not melt below 90 deg. C. However, this spec is based on continuous current over long period of time, not over the two minutes of match time we will encounter. What is more important to us is the resistance of the wire (length) used. A longer wire will drop more voltage at high currents so it is important to keep high current runs as short as possible. Don't forget that the total resistance is the sum of the positive wire, negative wire and all of the connection points. All things being equal, the 120 amp circuit breaker should adequately protect the #6 wire in our application.
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Good Luck All. Learn something new, everyday!
Al
WB9UVJ
www.wildstang.org
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Storming the Tower since 1996.