ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
ShoutChat
Recent Posts
UL 508A SPACING
by ale348 - 03/29/24 01:09 AM
Increasing demand factors in residential
by tortuga - 03/28/24 05:57 PM
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
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 (ale348), 302 guests, and 14 robots.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Joined: Aug 2005
Posts: 10
R
Member
Hello:

Was wondering if anyone has ever used the "point of use" (secondary type) Intermatic AG2401 model surge protector ?
If so, opinions on ?

It supposedly clamps at 490 V.

This seems to me awfully high, and possibly above what many solid state components and microprocessors would possibly be destroyed at.

Do you think it (still) would provide adequate protection and be worth installing ?

Any thoughts on this, or recommendations, perhaps, on similar units that clamp lower ?

BTW: when having worked within their limits, are typical MOV's usually good for many such clampings, or do they degrade quickly, even if the clampings were "nominal" ?

Much thanks,
Bob

Stay up to Code with the Latest NEC:


>> 2023 NEC & Related Reference & Exam Prep
2023 NEC & Related Reference & Study Guides

Pass Your Exam the FIRST TIME with the Latest NEC & Exam Prep

>> 2020 NEC & Related Reference & Study Guides
 

Joined: Jul 2002
Posts: 8,443
Likes: 3
Member
Bob,
What exactly are you trying to protect?.
Quote
It supposedly clamps at 490 V.
There are 2 different forms of Surge Protection
  • Coarse- Gets rid of most of the Surges that could hurt your Electrical system.
  • Often uses plug-in modules, fitted in the panel.
  • Once the plug-in module is spent, that's it.
    Other side of the coin and the most important:
  • Fine protection- Local protection of all electronic devices.

Lightning surges work on what is called a 8/20 uS Surge.

Joined: Aug 2005
Posts: 10
R
Member
Hi,

Thanks for help.

Have a new hot air furnace by Trane whose circuit board was fried during a recent lightning storm.

Have a very old electrical service box, and for a variety of reasons (no spare ckt breakers or room for new ones)I cannot install a "whole-house" surge protector at the service box. These require to two free ckt breakers which I don't have.

For now, it looks like the only reasonably practical approach is to put one of these Intermatic units in right next to the furnace, on the AC line going to it.

The 490 V clamping volt., however, bothered me. Seems a bit high; what do you think ?

What is this 8/20 us Surge spec., please ?
Have never heard of it.

Any other thoughts ?

Thanks again,
Bob


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