EN 50216-12:2011

SLOVENSKI STANDARD
01-junij-2011
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Power transformer and reactor fittings - Part 12: Fans
Zubehör für Transformatoren und Drosselspulen - Teil 12: Ventilatoren
Accessoires pour transformateurs de puissance et bobines d'inductance - Partie 12:
Ventilateurs
Ta slovenski standard je istoveten z: EN 50216-12:2011
ICS:
29.180 Transformatorji. Dušilke Transformers. Reactors
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 50216-12
NORME EUROPÉENNE
April 2011
EUROPÄISCHE NORM
ICS 29.180
English version
Power transformer and reactor fittings -
Part 12: Fans
Accessoires pour transformateurs de Zubehör für Transformatoren und
puissance et bobines d'inductance - Drosselspulen -
Partie 12: Ventilateurs Teil 12: Ventilatoren

This European Standard was approved by CENELEC on 2011-03-21. CENELEC members are bound to comply
with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard
the status of a national standard without any alteration.

Up-to-date lists and bibliographical references concerning such national standards may be obtained on
application to the Central Secretariat or to any CENELEC member.

This European Standard exists in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CENELEC member into its own language and notified
to the Central Secretariat has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus,
the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy,
Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia,
Spain, Sweden, Switzerland and the United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Management Centre: Avenue Marnix 17, B - 1000 Brussels

© 2011 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 50216-12:2011 E
Foreword
This European Standard was prepared by the Technical Committee CENELEC TC 14, Power
transformers.
The text of the draft was submitted to the formal vote and was approved by CENELEC as
EN 50216-12 on 2011-03-21.
The following dates were fixed:
– latest date by which the EN has to be implemented

at national level by publication of an identical

national standard or by endorsement
(dop) 2012-03-21
– latest date by which the national standards conflicting

with the EN have to be withdrawn
(dow) 2014-03-21
EN 50216-12 is to be read in conjunction with EN 50216-1, Power transformer and reactor fittings –
Part 1: General.
___________________
– 3 – EN 50216-12:2011
Contents
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 5
4 Requirements . 5
4.1 Rated values . 5
4.2 Rated power and noise . 6
4.3 Design of the drive . 6
4.4 Design of the connection box . 6
4.5 Design of the housing . 6
4.6 Design of the fan wheel . 6
4.7 Design of the protective grating / basket guard . 6
4.8 Materials . 7
4.9 Mechanical design . 7
4.10 Surface protective coating . 7
5 Identification . 7
5.1 Specifications for the fan rating plate . 7
5.2 Specifications for the motor rating plate . 8
6 Tests . 8
6.1 General . 8
6.2 Routine tests . 8
6.3 Type tests . 8
7 Transport and storage . 8
8 Installation and operation, operational performance . 9
9 Technical documentation . 9
Annex A (normative) Ordering designations .10
Annex B (informative) Performance of the fans .11
Annex C (informative) Design example .12
Bibliography .13

Figures
Figure B.1 – Performance of the fans . 11
Figure C.1 – Design example . 12

1 Scope
EN 50216-12 deals with fans for oil-to-air coolers used for transformers as well as fans used for
blowing out radiators. Only fans operating axially are dealt with in this standard specification.
This standard specification defines the dimensions and requirements for ensuring fan
interchangeability and uniform fan assembly.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
EN 22768-1 General tolerances – Part 1: Tolerances for linear and angular dimensions
without individual tolerance indications (ISO 2768-1)
EN 22768-2 General tolerances – Part 2: Geometrical tolerances for features without
individual tolerance indications (ISO 2768-2)
EN 50216-1:2002 Power transformer and reactor fittings – Part 1: General
EN 50262 Cable glands for electrical installations
EN 60034-1 Rotating electrical machines – Part 1: Rating and performance (IEC 60034-1)
EN 60529 Degrees of protection provided by enclosures (IP Code) (IEC 60529)
EN 60721-3-4 Classification of environmental conditions – Part 3: Classification of groups of
environmental parameters and their severities – Section 4: Stationary use at
non–weather protected locations (IEC 60721-3-4)
EN ISO 3506-1 Mechanical properties of corrosion-resistant stainless steel fasteners –
Part 1: Bolts, screws and studs (ISO 3506-1)
EN ISO 5801 Industrial fans – Performance testing using standardized airways (ISO 5801)
EN ISO 13857 Safety of machinery – Safety distances to prevent hazard zones being reached
by upper and lower limbs (ISO 13857)
ISO 10816-1 Mechanical vibration – Evaluation of machine vibration by measurements on
non-rotating parts – Part 1: General guidelines
ISO 13347-1 Industrial fans – Determination of fan sound power levels under standardized
laboratory conditions – Part 1: General overview
ISO 13347-3 Industrial fans – Determination of fan sound power levels under standardized
laboratory conditions – Part 3: Enveloping surface methods
ISO 14694 Industrial fans – Specifications for balance quality and vibration levels

– 5 – EN 50216-12:2011
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
drive
depending on the specification the motor used to drive the fan wheel can be either a three-phase a.c.
motor, an a.c. motor or a d.c. motor. The motor is mounted rigidly in the housing
3.2
connection box
the electrical connection between the external power supply (and control system if this exists) and the
internal connection is made in the terminal box. The terminal board is located in the connection box
3.3
housing
the housing is used for attaching the fan to the radiator or cooler; the housing also supports the motor.
In addition the protective grating and / or basket guard is / are attached to it
3.4
fan wheel
the fan wheel is mounted rigidly on the motor axle / rotor
3.5
protective grating / basket guard
the protective grating or basket guard is used to prevent accidental contact with the rotating parts.
Furthermore, the protective grating or basket guard also prevents large foreign bodies from coming
into contact with the parts
4 Requirements
4.1 Rated values
The following designations are used:
- f [Hz] = frequency;
- U [V] = rated voltage;
r
- I [A] = operating current during free blowing;
- I [A] = rated current of the motor;
r
- P [W] = active-power input during free blowing;
- η [%] = overall efficiency of the fan;
- N [1/min] = rotational speed;
- q [m /s] = volume flow of the fan during free blowing;
V
- p [Pa] = maximum static pressure which the fan can produce, in producing static
sF
pressure volume flow is reduced;
- L [dB(A)] = A-weighted sound power level of a fan during free blowing;
WA
- D [mm] = diameter of the fan wheel.
NOTE The characteristic curve should be delivered by the supplier (p = f(q )). The noise is dependent on the working point
sF V
and the installation conditions.

4.2 Rated power and noise
The values for air power and noise apply when protective gratings are fitted. The volume flow refers to
an air density = 1,20 kg/m³ at a temperature of t = 20 °C and an air pressure of 101,325 kPa (this
corresponds to a site altitude below 1 000 m). They are to be measured at rated voltage with the
associated frequency provided that no other operating data has been specified in the order.
4.3 Design of the drive
The motor shall comply with EN 60034-1 and suitable for unprotected outdoor installation.
The provided degree of protection is to be at least IP54 or above as per the order specification in
accordance with EN 60529.
Thermal class 155 as per EN 60034-1 applies to all motors.
Condensation water and any other intrusive water shall be able to run off without any damaging effect.
This applies to both horizontal and vertical mounting of the fan (blowing upwards). The bearings of the
motor shall be made in such a way that they are able to guarantee a trouble- and maintenance-free
running time (continuous operation) of at least 4 years (at least 3 years for four-pole operation) or
rather as agreed upon.
The connecting lead between the winding space of the motor and the cable compartment of the
terminal box can be run on both the inside and the outside.
4.4 Design of the connection box
The connection box (if present) shall be mounted in such a way that it is easily accessible. The
connection box is to provide protection to at least IP54 as per EN 60529. Condensation water in the
connection box shall not affect operation or lead to any damage.
Each of the terminals shall be suitable for holding down two 2,5 mm² leads at I < 1,5 A. At I > 1,5 A
each terminal shall be suitable for holding down two 4 mm² leads.
The earthing screw in the connection box shall be easily accessible.
Captive screws shall be used for the cover of the connection box.
Screwed cable glands (at least 2) as per EN 50262 made from nickel-plated brass are to be used for
the connecting lead inlet.
The cover seal shall be secured using suitable measures so that overpressing or slipping is prevented
at all times.
4.5 Design of the housing
As a rule the housing is cylindrical. The motor with fan wheel (chosen by the manufacturer) is mounted
on to the housing. The fixing points of the fan are likewise located on the housing. If a connection box
is mounted on the outside of the housing then the connection cables are to be suitably fixed.
The direction of air flow (in connection with the rotational direction) is to be indicated on the housing
using a durable marking (can also be combined with the rating plate).
4.6 Design of the fan wheel
The fan wheel shal
...