parallax power supply 7345ru parts PWM
My 7345 is not charging the coach batteries but does supply 12power to all accessories. The transformer, fan and relays work fine. Think i need a PWM circuit for it. Contacted PP tec support and th...
Forum Discussion
Sal wrote:
Here's a quiz question for you. At 45A, what's the largest gauge cable that will start a fire? We'll assume if you don't provide an answer then it's not an issue.
Let me guess ... since I'm 900 miles from home involved with a serious family health emergency and have no desire to look up wire gauge tables: How about the kluggy/cheap thin wiring in some RV's installed by the "high tech" nearly-engineering-less motorhome manufacturers? Maybe 16 awg might (eventually) heat up enough when carrying 45 amps so as to start a fire (eventually) ... perhaps even 14 awg might be a concern (eventually).
Also ... small wires contact connector surfaces in smaller cross-sectional areas than large wires do ... hence small wires carrying high currents can cause excessive heat around and in connectors more-so than larger awg sizes can. This may be especially a concern if the connectors with the small wires in them are subject to some corrosion, as is certainly the case in RV environments.
Again, without going to wire gauge tables, - I can't help but wonder why 15 amp residential circuits must use wiring no smaller than 14 awg and why 20 amp residential circuits must use wiring no smaller than 12 awg?
