Cruisers Forum

Join CruisersForum Today

Thread Tools Rate Thread Display Modes
Old 12-05-2016, 20:30   #31
Registered User

Join Date: Oct 2013
Posts: 468
Re: USB jacks phantom loads

I thought that the short lengths of wire that attached to appliances were
Inconsequential because they were too short to increase resistance? That could just be something that I read somewhere.

sully75 is offline   Reply With Quote
Old 13-05-2016, 15:19   #32
Registered User
CarinaPDX's Avatar

Join Date: Jan 2010
Location: Portland, Oregon, USA
Boat: 31' Cape George Cutter
Posts: 1,392
Re: USB jacks phantom loads

Sully75- there are two issues relating to wire size, voltage drop and ampacity. A short piece of small wire will probably not result in significant voltage drop. However, it will have a lower current limit (ampacity) and will require a smaller circuit breaker or fuse to protect against fire. To explain, the smaller wire will heat up from the relatively large current that could easily be conducted through the larger supply cable, and if this heat exceeds the temperature rating of the wire's insulation it can melt the insulation or even start a fire. Thus the circuit breaker must be sized to protect at the maximum current allowed through the smaller wire, no matter how short. This will limit the current that can be allowed on the entire branch, unless the device has its own fuse or breaker.


CarinaPDX is offline   Reply With Quote


Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
opencpn linux mint 13 and GPS USB SKYTRAQ GM 65 Skytraq - chipset Venus 6 USB - NMEA archimede OpenCPN 2 18-02-2013 03:04
Garmin USB-USB Cable + Windows7? HamishB OpenCPN 4 24-05-2011 02:13
How to Handle USB GPS and NMEA to USB Inputs sailracer OpenCPN 16 16-04-2011 07:22
Isolate Shore Power Loads from Inverter Loads RoyHB Electrical: Batteries, Generators & Solar 4 19-04-2010 05:02
Powered USB Hub vs Powered USB Cables Bryan Kemler Monohull Sailboats 2 20-01-2010 15:24

Our Communities

Our communities encompass many different hobbies and interests, but each one is built on friendly, intelligent membership.

» More about our Communities

Automotive Communities

Our Automotive communities encompass many different makes and models. From U.S. domestics to European Saloons.

» More about our Automotive Communities

Marine Communities

Our Marine websites focus on Cruising and Sailing Vessels, including forums and the largest cruising Wiki project on the web today.

» More about our Marine Communities

Copyright 2002-2015 Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 19:07.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2016, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2016, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.