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Protection against overvoltages caused by lightning strikesPRF1, PRD, PF surge arresters: easier to install, improved effectiveness
A guide to help you choose the right surge arrester
With Merlin Gerin,lightning protection can easily be integrated into the power distribution system
Merlin Gerin is today one of the leading global brands of power distribution equipment.In the quest for ever greater safety and continuity of service, the ranges are changing to meet all residential, tertiary and industrial protection requirements.
«90% of power outlets supply equipment incorporating electronic devices.»
More and more electrical equipment is today sensitive to overvoltages caused by lightning strikes.
In response to these new requirements, Merlin Gerin, the leading power distribution manufacturer, is devoting its efforts to lightning protection.
To make it easier to select surge arresters for electrical installations and to implement and maintain them, 550 specialists design and produce surge arresters in compliance with international standards. Merlin Gerin’s surge arresters are highly suitable for electrical contractors and meet their users’ most stringent requirements.
From Grenoble to Salt Lake City, from Brussels to Shanghai, quality requirements are being pushed to the limit. Each site has obtained ISO 9001 and/or ISO 14001 certification.
With Merlin Gerin,lightning protection can easily be integrated into the power distribution system
For all low voltage switchboards and electrical enclosures, a range of surge arresters that is simple to install.
The effectiveness of lightning protection is closely related to the implementation of its surge arresters.
To ensure the protection of equipment connected to • low voltage networks,• telecommunications networks,• computer networks,
Merlin Gerin has designed a complete range of surge arresters that can be perfectly integrated into the enclosures and electrical switchboards of its switchgear assembly and installation systems.
• Certified coordination between the surge arrester and its disconnection circuit breaker,
• Protection against the nuisance tripping of “si” and “SiE” earth leakage protection devices during a lightning strike,
• Easy to implement and use,
• Compatibility with all earthing systems (TT, TNS, TNC, IT),
• Technical and aesthetic consistency,
• Compliance with standards,
• Availability of products and services.
A Merlin Gerin innovation, Quick PF and Combi PRF1ready-to-wire surge arresters incorporate their own disconnection circuit breaker: easy to choose and simple to install for greater effectiveness.
Merlin Gerin,helping professionals to choose the best lightning protection
1 Estimate the value of the equipment to be protected
The value is estimated by considering:n the financial cost
of the equipment
n the economic impact of equipment downtime
n domestic equipment:n audio-video equipment,
computers,n electrical appliances, n burglar alarm.
n building equipment: n fire alarm, access control, n automated heating or
air-conditioning, n lift.
n business equipment:n programmable machine, n server, n sound or light control system.
n heavy equipment:n medical infrastructure, n production infrastructure, n heavy computer processing.
2 Determine the type of building
Lightning protection can be calculated for an entire building or for part of a building that is electrically independent.
n detached house,
n flat, small semi-detached house,
n common areas of a building,
n professional premises.
To meet all protection requirements more effectively:
n residential buildings
n tertiary buildings
n industrial buildings
Merlin Gerin,helping professionals to choose the best lightning protection
As proof of the complete effectiveness of lightning protection in meeting each need, Merlin Gerin offers a simple and effective selection method.
3 Identify the type of power distribution
Depending on the size of the building and the extent of its electrical system, one or more surge arresters must be used in the various switchboards in the installation.
Integration into the electrical power
distribution:
n single switchboard or main switchboard,
n subdistribution board,
n sensitive equipment more than 30 m from the switchboard.
4 Understand the risk of the impact of lightning on the site
Lightning is attracted by high points that conduct electricity. They can be:n natural: tall trees, mountain
peaks, damp areas, ferrous soils.
n artificial: chimney stacks, aerials, pylons, lightning rods.
Indirect effects can be incurred within a fifty metre radius around the point of impact.
Location of the building:
n in an urban, suburban, grouped housing area.
n in plain area.
n in an area where there is a special risk (pylon, tree, mountainous region, mountain peak, damp area or pond).
n in an exceptionally exposed area (lightning rod within 50 metres of a building).
PRF1, PRD, PF surge arrester selection guide
common equipment
Computers,electrical appliances,
audio-video equipment,burglar alarm,
etc.
Detachedhouse
Flat, smalsemi-detached
house
Common areasof a building
Professional premises
building equipment
Fire alarm, automated heating
orair-conditioning,
lift,access control, etc.
Single switchboard
ormain
switchboard
Subdistributionboard
E
QUIP
MEN
T TO
BE
PROT
ECTE
D T
YPE
OF B
UILD
ING
TY
PE O
F
POW
ER
DIST
RIBU
TION
R
ISK
OF T
HE IM
PACT
O
F LI
GHTN
ING
CHOICE
PRF1Master
NS 160N 160A
1
Surge arresterswith integrated disconnector
2
3
4
Choice of disconnectors to be associated with the surge arrestersThe choice of a disconnector that is 100% coordinated with the surge arrester ensures complete safety at the end of life phase of the surge arrester.
PRD8PF8
C60H 20ACurve C
C60N 20ACurve C
PRD20PF20
PRD40PF40
PRD65PF65
C60H 25ACurve C
C60N 25ACurve C
C60H 40ACurve C
C60N 40ACurve C
C60H 50ACurve C
C60N 50ACurve C
Other surge arresters: choice of associated disconnector
6kA 10kA 15kA
QUICKPF PF40
CombiPRF1
+ PF40
CombiPRF1
+ PF40
QUICKPF PF40 PF65
CombiPRF1
+ PF40
CombiPRF1
+ PF40
QUICKPF PF40
CombiPRF1
+ PF40
CombiPRF1
+ PF40PRD20 PRD40 PRD40
Combi PRF1or
PRF1 Master +PRD40
PF20 PF40 PF40Combi PRF1 or PRF1 Master
+PF40
Quick PF 1P+NIsc = 6 kA
Quick PF 3P+NIsc = 6 kA
Combi PRF1 1P+NIsc = 6 kA
Combi PRF1 3P+NIsc = 6 kA
ALTERNATIVE
+ +
PRF1, PRD, PF surge arrester selection guide
building equipment
Fire alarm, automated heating
orair-conditioning,
lift,access control, etc.
Subdistributionboard
Dedicated protection, more than
30 m from a switchboard
business equipment
Programmable machine,
server,sound or
light control system, etc.
Single switchboard
or main switchboard
Subdistributionboard
Dedicated protection, more than
30 m from a switchboard
heavy equipment
Medical, production,
or heavy computer processing
infrastructure,etc.
Single switchboard
or main switchboard
Subdistributionboard
Dedicated protection, more than
30 m from a switchboard
NS 160N 160A NS 160H160A
50kA
Choice of disconnectors to be associated with the surge arrestersThe choice of a disconnector that is 100% coordinated with the surge arrester ensures complete safety at the end of life phase of the surge arrester.
Protection of telecommunications and computer equipment
Lightning can also propagate through telecommunications and computer networks.It can damage all the equipment connected to these networks: telephones, modems, computers, servers, etc.
C60H 20ACurve C
Contact usC60H 25ACurve C
C60H 40ACurve C Contact us
Contact usC60H 50ACurve C
Other surge arresters: choice of associated disconnector
15kA 25kA 36kA 70kA
Choice of PRC and PRI surge arresters PRC PRI
Analogue telephone networks <200V n
Digital networks, analogue lines <48V n
Digital networks, analogue lines <6VELV load supply <48V n
PRD20 PRD40 PRD40Combi PRF1
or PRF1 Master
+PRD40
PF20 PF40 PF40Combi PRF1 or PRF1 Master
+PF40
PRD20
PF20
PRD8
PF8
PRD40 PRD65 PRD65Combi PRF1
or PRF1 Master
+PRD40
PF40 PF65 PF65Combi PRF1 or PRF1 Master
+PF40
PRD20
PF20
PRD8
PF8
PRD65Combi PRF1
+ PRD40
Combi PRF1or
PRF1 Master +PRD40
Combi PRF1or
PRF1 Master +PRD40
PF65 Combi PRF1 +PF40
Combi PRF1 or PRF1 Master
+PF40
Combi PRF1 or PRF1 Master
+PF40
PRD20
PF20
PRD8
PF8
+ + + + + +
Icc
Merlin Gerin, a range for all your applications
Merlin Gerin is at your side day by day and has designed simple, practical tools to help you quickly select and implement the right lightning protection:
• product catalogue
• uselection assistance software
As standard specifications and designs change from time to time, please ask for confirmation of the information given in this publication.
Realization: Schneider ElectricDesign: Félix CréationPhotos: Schneider Electric
Schneider Electric Industries SAS
Electrical Distribution Communication38050 Grenoble Cedex 9 - FranceTel.: +33 (0)4 76 57 60 60www.merlin-gerin.comwww.schneider-electric.com
09.2006M9DP80AEn
Lightning protection 3P + NSurge arrester Reference Disconnector
Quick PF 16618 integrated
Combi PRF1 16629 integrated
PRF1 Master 16630 (x4) NS 106 N TM160D
PRD65r 16559 C60N or H C50PRD40r 16564 C60N or H C40PRD40 16569 C60N or H C40PRD20r 16674 C60N or H C25PRD20 16574 C60N or H C25PRD8r 16679 C60N or H C20PRD8 16579 C60N or H C20
PF65r 15685 C60N or H C50PF65 15586 C60N or H C50PF40r 15688 C60N or H C40PF40 15690 C60N or H C40PF20 15693 C60N or H C25PF8 15696 C60N or H C20
Lightning protection 1P + NSurge arrester Reference Disconnector
Quick PF 16617 integrated
Combi PRF1 16626 integrated
PRF1 Master 16630 (x2) NS 106 N TM160D
PRD65r 15557 C60N or H C50PRD40r 16562 C60N or H C40PRD40 16567 C60N or H C40PRD20r 16672 C60N or H C25PRD20 16572 C60N or H C25PRD8r 16677 C60N or H C20PRD8 16577 C60N or H C20
PF65 15684 C60N or H C50PF40 15687 C60N or H C40PF20 15692 C60N or H C25PF8 15695 C60N or H C20
Telecommunications and computer equipment protection Surge arrester Reference
PRC 200V 16593PRI < 6V 16594PRI < 48V 16595