ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals

ECN Shout Chat
Top Posters(30 Days)
Admin 19
Recent Posts
fuse rejectors
by NORCAL. 03/29/17 01:44 AM
Old decora style outlets
by NORCAL. 03/29/17 01:41 AM
NFPA stuff
by gfretwell. 03/28/17 08:08 PM
Anyone hiring inspectors?
by HotLine1. 03/27/17 08:03 AM
ESA Arc flash course
by TheShockDoctors. 03/24/17 10:15 AM
New in the Gallery:
SE cable question
Popular Topics(Views)
231,704 Are you busy
166,609 Re: Forum
160,776 Need opinion
Who's Online Now
0 registered members (), 53 guests, and 11 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate This Thread
#21275 - 01/30/03 01:17 AM 18A. breaker = 30A Fuse???  
Joe Henry  Offline
Junior Member
Joined: Jan 2003
Posts: 2
Can someone please explain this to me? I have a device (electric fishing downrigger) in which the manufacturer has stated the following..."a 30A fuse or an 18A circuit breaker must be installed as close to the battery as possible" Ok, I do not understand this. There are 12AMPS of difference here, so how can they both protect equally? Thanks, Joe.

Work Gear for Electricians and the Trades

#21276 - 01/30/03 08:25 AM Re: 18A. breaker = 30A Fuse???  
Redsy  Offline
Joined: Mar 2001
Posts: 2,056
Bucks County PA
The (non time delay) fuse is oversized to permit inrush (starting) current to flow without blowing it. A thermal circuit breaker has an inherent ability to overcome inrush.
It must be a special CB if it is available at 18 amps.

#21277 - 01/30/03 11:03 PM Re: 18A. breaker = 30A Fuse???  
HotLine1  Offline

Joined: Apr 2002
Posts: 6,803
Brick, NJ USA
"As close to the BATTERY..."
Gee, is this a "marine" application??
Are ya running it off 12 volt?? 24 volt??
or 120 fropm a genset??
By your wording, it sounds like 12/24 volt DC.


#21278 - 01/31/03 12:20 AM Re: 18A. breaker = 30A Fuse???  
Joe Henry  Offline
Junior Member
Joined: Jan 2003
Posts: 2
Thanks for the responses guys, I appreciate it. Oh, its a 12Volt battery and it is a marine application, thanks.

Member Spotlight
kamloops BC Canada
Posts: 1,137
Joined: May 2003
Show All Member Profiles 

2017 NEC and Related
2017 NEC
Now Available!

Shout Box
Powered by UBB.threads™ PHP Forum Software 7.6.0
Page Time: 0.010s Queries: 14 (0.003s) Memory: 0.7571 MB (Peak: 0.8901 MB) Zlib enabled. Server Time: 2017-03-29 07:22:55 UTC