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Unread 07-01-2008, 14:10
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
Rookie Year: 1996
Location: Wheeling, IL
Posts: 10,792
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Re: pic: XBot Electronics Day 2

For the record...
<R54> All wires distributing power with a constant polarity (i.e., except for relay module, speed
controller, or sensor outputs) shall be color-coded as follows:
• Use red, white, or brown wire for +12 Vdc and +5 Vdc connections.
• Use black or blue wire for common (-) connections.

AND

<R50> The 12V battery, the main 120-amp circuit breaker, the power distribution block, and circuit
breaker distribution panels shall be connected as shown in the 2008 Power Distribution
Diagram.
In particular:

• All circuit breaker distribution panels must be connected directly to the power
distribution block. No intermediate connections are permitted.

Not only does daisy chaining the power violate rules it is a bad idea, causing the voltage drop from your high current loads to lower the available voltage to the RC. Split your high current loads when possible.
As to the color code, my personal position is to use the color codes normally used in your area so that your students become accustomed to industry standards. Although brown and blue are european standards they are not in this country.
All teams should take note of the placement of the high current components such that #6 wire runs are short and direct.
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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.
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