MINISTRY OF HEALTH
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SOCIALIST REPUBLIC OF
VIETNAM
Independence - Freedom - Happiness
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No. 25/2016/TT-BYT
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Hanoi, June 30, 2016
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CIRCULAR
NATIONAL
TECHNICAL REGULATION ON INDUSTRIAL-FREQUENCY ELECTROMAGNETIC FIELDS -
PERMISSIBLE EXPOSURE LEVEL OF INDUSTRIAL-FREQUENCY ELECTROMAGNETIC FIELDS IN
THE WORKPLACE
Pursuant to the Law on Labour Hygiene and
Safety No. 84/2015/QH13 dated June 25, 2015;
Pursuant to the Law on Technical regulations
and standards No. 68/2006/QH13 dated June 29, 2006;
Pursuant to the Government's Decree No.
127/2007/ND-CP dated August 01, 2007 detailing the implementation of a number
of articles of the Law on Technical regulations and standards;
Pursuant to the Government's Decree No. 63/2012/ND-CP
dated August 31, 2012 defining functions, tasks, entitlements and
organizational structure of the Ministry of Health;
At the request of Director of Health
Environment Management Agency;
The Minister of Health promulgates a Circular
on the National Technical Regulation on Industrial-frequency electromagnetic
fields - Permissible Exposure Level of Industrial-frequency electromagnetic
fields in the Workplace
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The National Technical Regulation on “Industrial-frequency
electromagnetic fields - Permissible Exposure Level of Industrial-frequency
electromagnetic fields in the Workplace” is promulgated together with this
Circular.
Article 2. Effect
This Circular comes into force from December
01, 2016.
Article 3.
Responsibility for implementation
The Director of Health Environment Management
Agency, heads of other Departments and Agencies of the Ministry of Health,
Directors of Provincial Departments of Health, heads of health authorities of
other Ministries and central authorities are responsible for the implementation
of this Circular./.
PP MINISTER
DEPUTY MINISTER
Nguyễn Thanh Long
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NATIONAL
TECHNICAL REGULATION ON INDUSTRIAL-FREQUENCY ELECTROMAGNETIC FIELDS - PERMISSIBLE
EXPOSURE LEVEL OF INDUSTRIAL-FREQUENCY
ELECTROMAGNETIC FIELDS IN THE WORKPLACE
Foreword
QCVN 25:2016/BYT is drafted by the Drafting
Board specialized in labor-related National Technical Regulations, submitted by
Health Environment Management Agency and promulgated together with Circular No.
25/2016/TT-BYT by the Minister of Health.
NATIONAL TECHNICAL
REGULATION ON INDUSTRIAL-FREQUENCY ELECTROMAGNETIC FIELDS - PERMISSIBLE
EXPOSURE LEVEL OF INDUSTRIAL-FREQUENCY ELECTROMAGNETIC FIELDS IN THE WORKPLACE
I. GENERAL PROVISIONS
1. Scope
This document provides for the permissible
exposure level of industrial-frequency electromagnetic fields in the workplace.
2. Regulated entities
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3. Definitions
For the purpose of the document, the terms
below are construed as follows:
3.1. Electromagnetic field is a field of force
characterized by interactions between charged particles, created by charged
particles, and a combination of electric field and magnetic field.
3.2. Industrial-frequency electromagnetic
fields are electromagnetic waves with a frequency of 50Hz to 60Hz created by
electrostatic induction and electromagnetic fields from power sources, power
lines and electric devices.
3.3. Electric field intensity is the effective
magnitude of the electric field vector (E) at a point, determined by force (F)
on a unit of area (q) at a point in the field, expressed as voltage per meter (V/m):
3.4. Magnetic field intensity (H) is the
effective magnitude of the magnetic field vector, expressed as ampere per meter
(A/m).
II. TECHNICAL
PROVISIONS
1. Permissible exposure to electric fields
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Table 1. Permissible
exposure levels of electric fields in the workplace
Electric field
intensity E
(kV/m)
<5
5≤ E≤ 20
20<E<25
≥25
Permissible exposure
period
(minute)
Unlimited
(50/E-2).60
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No exposure
- If workers are provided with protective
equipment, the permissible exposure periods in the workplace shall vary
according to the protective equipment provided.
2. Permissible exposure levels of magnetic fields
Table 2. Permissible
exposure levels of magnetic fields in the workplace
Permissible exposure
period
(hour)
Magnetic field
intensity – H
(A/m)
8
400
<2
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III. DETERMINATION
METHODS
Industrial-frequency electromagnetic fields
shall be measured as follows:
1. Principles
- Measure electromagnetic fields in the area
where their sources are located and where workers are affected by
industrial-frequency electromagnetic fields.
- Measurement time: When a new device is put into
operation, a new workplace is established, changes are made to a device,
periodic measurements.
- Electricity safety regulations must be strictly
complied with during measurement.
2. Measuring devices:
- Measuring devices shall comply with regulations
of law on measurements. A device for measuring industrial-frequency
electromagnetic fields must have an antenna capable of receiving 50 – 60 Hz
electromagnetic waves.
- Measurement limits:
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+ Magnetic field: 0,1 mA/m – at least 5000 A/m
- Minimum sensitivity: Electric field: 0,01 V/m;
Magnetic field: 0,01 mA/m.
3. Measurement techniques
- Measuring electromagnetic fields at electric
devices: power generators, transformers on the ground or floor: Place the
measuring device at the same level as the worker’s chest (if standing) or head
(if sitting) or a point on the worker’s body that is closest to the source.
- Measuring electromagnetic field at high-voltage
devices and power lines:
+ For power lines: Place the measuring device
below the line or at a distich of 1, 2, 5, etc. meters from the line or from
the worker’s position that is affected by electromagnetic field of the line.
+ For substations: Measure at various positions
in the substation according to their technical positions.
+ At each position, measure at 3 heights of
0,5m, 0,8m and 1,6m from the ground or floor and at a distance of 0,5m from the
earthing device, calculate the mean value.
- Place the measuring device on a holder or hold
it in the hand. Turn on the device, measure electric field and magnetic field
at the aforementioned positions. When a stable value is displayed on the
screen, write it on the record.
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1. Facilities in which workers are exposed to industrial-frequency
electromagnetic fields shall periodically measure and assess
industrial-frequency electromagnetic fields at least once a year in accordance
with regulations of the Labor Code and the Law on Labour Hygiene and Safety.
2. Employers shall provide workers with adequate
personal protective equipment that is suitable for their working environment as
prescribed by the Law on Labour Hygiene and Safety.
3. If the industrial-frequency electromagnetic
fields in the workplace exceeds the permissible levels, the employer shall
promptly implement measures for improving working conditions and protect
workers’ health.
V. ORGANIZING THE
IMPLEMENTATION
1. This document replaces the Standard for
Low-frequency Magnetic Field and Standard for Low-frequency Electric Field
Intensity promulgated together with Decision No. 3733/2002/QD-BYT dated October
10, 2002 of the Minister of Health.
2. Health Environment Management Agency – Ministry
of Health shall take charge and cooperate with relevant authorities in
providing guidance and organizing the implementation of this document.
3. Health Environment Management Agency shall
propose necessary revisions to this document to the Ministry of Health.
4. In case any of the national standards for
industrial-frequency electromagnetic fields cited herein is revised or
replaced, the newer document shall apply.