Comments on: Lightning & Surge protection

By: Laurent

Laurent — Mon, 21 Jun 2010 17:02:36 +0000

We appreciate your presence on our blog, what we hope is that you will take benefit of your experience on the Lightning proctection subject to add valuable comment to the proposed topic. Direct promotion without added-value to our community will be taken out.
Blog moderator team

By: SUPPLYING, LIGHTNING PROTECTION &SURGE PROTECTION

SUPPLYING, LIGHTNING PROTECTION &SURGE PROTECTION — Sun, 20 Jun 2010 00:36:14 +0000

(this comment has been edited by moderator team) Our society ~~XXXXXXXX~~ is one of the professional companies specialize in the prevention of lightning damaging effects at Vietnam and neighbor countries. We are a leader in Distribution, Installation, Maintenance, Consultancy and Designing services, supervision of installation of system, measuring of lightning protection, grounding systems and transient voltage surge suppression technology.

By: arc fault breaker

arc fault breaker — Mon, 01 Feb 2010 22:34:07 +0000

Whoa, gotta love that picture of the lightning. Must have been a super high-end camera with superb timing to capture a shot like that. Any idea of what city that is of?
-Jack

By: kwame ofori

kwame ofori — Sat, 19 Dec 2009 13:32:10 +0000

my commumity power suplly suffers from low voltage between the hours of 6 and 9 when all electrical equipment(electric cookers,a/c ) are switced on .new buildings have sprang up all dependig on the same supply.please,
what are the effect of the low voltage on electrical appliances,
what are some other couses of the low voltage,
what are the possible solutions.
thanks

By: marsa protector

marsa protector — Mon, 09 Nov 2009 01:54:47 +0000

Please refer to Epcos website and download form there

By: marsa protector

marsa protector — Mon, 09 Nov 2009 01:49:31 +0000

Fuse only functioned in steady state condition.But lightning & surge happened in transient condition.The different is times d/dt .

Some other manufacture use the fuse is to protect the current and temperature.for normal supply current is below than 2-3A.That why manufacturer will used fuse rating 10-15A.Depend on rating MOV’s.

By: marsa protector

marsa protector — Mon, 09 Nov 2009 01:39:15 +0000

Our company manufactured surge protector. any question you can direct to my email itachidungga@yahoo.com.my

By: Didier Mignardot

Didier Mignardot — Wed, 26 Aug 2009 13:38:34 +0000

As you can see below, coordination between SPD and MCB(F2 in the text) is given by the manufacturer’SPD instructions

extract from IEC 60364-5-534:
“534.2.4 Protection against overcurrent and consequences of an SPD failure
Protection against SPD’s short-circuits is provided by the overcurrent protective devices F2
(see figures in the annexes A to D) which are to be selected according to the maximum
recommended rating for the overcurrent protective device given in the manufacturer’s SPD
instructions.”

moreover the product standard IEC 61643-11 refers to disconnector (overcurrent protective devices) as you can show below:

extract from IEC 61643-11/2005:
” 6.2.7 SPD disconnector
The SPD may have SPD disconnectors (which can be either internal, external or both). Their
operation shall be indicated.
NOTE Installation requirements not related to the SPDs may require additional and/or lower rated overcurrent protective devices.
SPD disconnectors shall be tested with the SPD during the sequence of type tests of 7.7 and
7.8.3, except for RCDs, which are not tested during the operating duty test according to
7.7.1.”

My advice is to contact manuifacturer’s SPDs and ask to them this coordination table

By: tanvir shaikh

tanvir shaikh — Tue, 21 Jul 2009 04:58:45 +0000

i am studying short circuit calculation for power systems.pls send me the data for designing and selection of protective devices for sc

By: Electrical Rewiring

Electrical Rewiring — Thu, 02 Jul 2009 06:51:49 +0000

Thanks for this post