ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
ShoutChat
Recent Posts
Childrens safety outlets
by dsk - 06/25/22 04:07 PM
AC-DC stage Ultra-Fast charger, how it's made?
by libellis - 06/25/22 12:17 PM
Your favourite food?
by NORCAL - 06/16/22 12:06 AM
Price action trading with RENKO
by gfretwell - 06/15/22 02:08 PM
Please Help Wiring DCDC Buck Converter
by gfretwell - 06/15/22 01:58 PM
New in the Gallery:
240/208 to a house
240/208 to a house
by wa2ise, October 9
Now you know.
Now you know.
by Tom_Horne, September 7
Who's Online Now
0 members (), 11 guests, and 17 robots.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
#215603 06/08/15 01:55 AM
Joined: Mar 2004
Posts: 947
T
twh Offline OP
Member
Is it normal to install surge protection without a breaker? The surge protection in question has fuses and is on an 800 amp cdp. How would you change fuses without shutting down everything on the cdp, like the servers, office computers on three floors, the lights and the elevator?

[Linked Image from i900.photobucket.com]

Joined: Jul 2004
Posts: 9,696
Likes: 11
G
Member
I agree this may be a poor design but if there are fuses in the SP, it is legal. I suppose with the right PPE and tools you could change the fuses hot but the only reason they would fail is a fault in most cases (shorted MOV) and the new fuse is going to "flashbulb" most of the time.
I would put it on a breaker.


Greg Fretwell
Joined: Nov 2002
Posts: 792
Likes: 2
W
Member
If this box claims to clamp transients of a few nanoseconds, the coil usually in circuit breakers may interfere with that. The coils would look like a high impedance to transient spikes that short. However, most power supplies in servers and computers contain filtering coils of much higher inductance, so such short transients shouldn't be much of an issue.

For longer transients, the circuit breaker shouldn't be an issue.

Joined: Apr 2002
Posts: 7,299
Likes: 6
Member
As this is in Canada, IF the install is compliant with the CEC, it also conforms to the mfg. install guidelines.

"2.1.4 Wiring
Turn OFF the power to the electrical distribution
equipment where the CPS Filter is to be installed.
Install a branch circuit breaker to feed the CPS filter
device for ease of installation. The unit contains UL
and CSA approved fusing to protect against short
circuit fault conditions within the device.
Over current protection is not specifically required,
although most customers choose to install a circuit
breaker as a disconnect device on panelboards or
switchgear assemblies. (See Table 2 for suggested
circuit breaker size). Follow NEC, CEC and applicable
local codes when connecting the CPS directly to the
Bus Bar."

IMHO, a branch circuit CB as suggested within the guidelines would be the way to go, and how all I have seen are installed.


John

Link Copied to Clipboard
Featured:

Tools for Electricians
Tools for Electricians
 

* * * * * * *

2020 Master Electrician Exam Preparation Combos
2020 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Member Spotlight
Radar
Radar
Los Angeles
Posts: 349
Joined: April 2004
Top Posters(30 Days)
dsk 2
dobler 2
Asset 2
Popular Topics(Views)
293,163 Are you busy
225,241 Re: Forum
210,635 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.7.5