ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
ShoutChat
Recent Posts
Increasing demand factors in residential
by gfretwell - 03/28/24 12:43 AM
Portable generator question
by Steve Miller - 03/19/24 08:50 PM
Do we need grounding?
by NORCAL - 03/19/24 05:11 PM
240V only in a home and NEC?
by dsk - 03/19/24 06:33 AM
Cordless Tools: The Obvious Question
by renosteinke - 03/14/24 08:05 PM
New in the Gallery:
This is a new one
This is a new one
by timmp, September 24
Few pics I found
Few pics I found
by timmp, August 15
Who's Online Now
1 members (gfretwell), 32 guests, and 14 robots.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
#16741 11/16/02 01:46 AM
Joined: Oct 2002
Posts: 5
M
Junior Member
how do you size a cartridge fuse to fit a particular disconnect? in the switchgear i need fuses it says only "type j" but i'm not sure how to order them so they fit right.

#16742 11/16/02 07:43 AM
Joined: Oct 2000
Posts: 5,392
S
Member
if your disco states type j, then you only need spec voltage & amperage...

#16743 11/16/02 12:52 PM
Joined: Jun 2002
Posts: 186
M
mj Offline
Member
a listed disconnect will indicate the size, type ocpd required.

#16744 11/16/02 11:27 PM
Joined: Apr 2002
Posts: 2,527
B
Moderator
An example is http://www.bussmann.com/library/docs/LowPeakCat.pdf

Their Class-J versions [LPJ-series] up to 600A @ 600V and 300,000AIC.




[This message has been edited by Bjarney (edited 11-16-2002).]

#16745 11/17/02 12:08 AM
Joined: Feb 2002
Posts: 2,233
H
Member
Just make sure you follow what the blue print says. You might fail a final inspection if the print calls for a type "J" fuse and you have a type "R" fuse instead.

#16746 11/17/02 12:26 AM
Joined: Jul 2002
Posts: 8,443
Likes: 3
Member
Mike,
What is a j-type fuse?.
We work on the following type fuses,(HRC)
to IEC Requirements:
P1: Semi-conductor Devices Protection- 1.0-
1.1 protection.
Q1: General protection, lighting power.
Q2: General protection Sub-Mains, other Equipment.
R: Motor rated links for 3 Phase or other motors upon start-up.

#16747 11/17/02 11:51 AM
Joined: Apr 2002
Posts: 2,527
B
Moderator
Trumpy—in general, 600V Class-J fuses are available in "semi-fast" [non-motor]and "slow" time-current curves [motor]. About 10 years ago the interrupting rating of 300KA became available in the US. At that time the justification was that there were a ±dozen US cities with "downtown" electric networks that were so stiff that 200kA interrupting was underrated.


Link Copied to Clipboard
Powered by UBB.threads™ PHP Forum Software 7.7.5