Download CPD Talk for Registered Electrical Worker

CPD Talk
for
Registered Electrical Worker
Module 1
Statutory and Safety Requirements
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Content
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Electricity Ordinance (EO)
Registration of electrical worker and electrical
contractor
Responsibilities of registered electrical worker and
registered electrical contractor
Electrical work safety practices
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Electricity Ordinance (EO)
Major subsidiary regulations
Electricity (Registration) Regulations
Registration of:
Electricity
Ordinance
(Cap. 406)
•
Electrical workers
•
Electrical contractors
•
Generating facilities
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Electricity Ordinance (EO)
Major subsidiary regulations
Electricity (Registration) Regulations
Electricity (Wiring) Regulations
Electricity
Ordinance
(Cap. 406)
•
Technical requirements
•
Safety requirements
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Electricity Ordinance (EO)
Major subsidiary regulations
Electricity (Registration) Regulations
Electricity (Wiring) Regulations
Electricity
Ordinance
(Cap. 406)
Electricity Supply Regulations
Electrical Products
(Safety) Regulations
Electricity Supply Lines
(Protection) Regulations
•
Works involving underground
work (e.g. installation of
earth electrode)
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Registration of Electrical Worker
“Electricity Ordinance” Section 31(1)：
No person shall do personally or offer or undertake to do
electrical work personally unless he is a registered electrical
worker who is entitled by his certificate to do the work.
A person who commits an offence under this section is liable
to a fine of $50,000 on a first conviction and a fine of
$100,000 on a subsequent conviction for the same offence
and in either case is liable to imprisonment for 6 months.
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Registration of Electrical Worker
Electrical Works are classified to five grades:
Grade
Electrical Works
A
Low voltage fixed electrical installation that has a maximum demand not
exceeding 400 A, single or three phase.
B
Low voltage fixed electrical installation that has a maximum demand not
exceeding 2500 A, single or three phase.
C
Low voltage fixed electrical installation of any capacity.
H
High voltage electrical installation.
R
May include one or more of the following• NS - electrical work on a neon sign installation;
• AC - electrical work on an air-conditioning installation;
• GF - electrical work on a generating facility installation;
• WH - electrical work on an unvented electric thermal storage type
water heater;
• CD - connection and disconnection of electricity supply to / from an
low voltage electrical equipment and associated electrical work
on the equipment
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Registration of Electrical Worker
Grade A, Grade B and Grade C electrical works are classified
according to the maximum demand of low voltage fixed electrical
installations.
Generally, the maximum demand of electrical installation is equivalent
to the total approved loading allowed by electricity supplier.
If the overcurrent setting of the main switch of a circuit is less than the
electricity supplier’s approved loading, the grade of the circuit is
determined in accordance with the actual overcurrent setting.
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Grade A Electrical Work
Low voltage fixed electrical installation
that has a maximum demand not
exceeding 400 A, single or three phase.
Example:
Typical old buildings with the maximum
demand not exceeding 400A.
≤400A
Power supply from
Electricity company or
other equipments
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Grade B Electrical Work
Low voltage fixed electrical installation
that has a maximum demand not
exceeding 2500 A, single or three phase.
Example:
(a) a single-source low voltage fixed
electrical installation that has a
maximum demand not exceeding 2500A
≤ 2500A
Power supply
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Grade B Electrical Work
Example:
(b) a multiple source
low voltage fixed
electrical installation
that has a total
maximum demand not
exceeding 2500A
Power Supply 1
Power Supply 2
400A < Power Supply 1 + Power Supply 2 ≤ 2500A
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Grade C Electrical Work
Low voltage fixed electrical installation
of any capacity.
Example:
(a) a single source low voltage fixed
electrical installation that has a
maximum demand exceeding 2500A
> 2500A
Power supply
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Grade C Electrical Work
Example:
(b) a multiple source low
voltage fixed electrical
installation that has a
total maximum demand
exceeding 2500A
Power Supply 1
Power Supply 2
Power Supply 1 + Power Supply 2 > 2500A
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Grade H Electrical Work
•
High voltage:
a) The voltage difference between two phases
exceeds 1000Vrms in AC, or exceeds 1500V in DC
b) The voltage difference between phases and ground
exceeds 600Vrms in AC value, or exceeds 900V in
DC
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Grade R Electrical Work
Include electrical works on one or more of the
following:
NS: Neon sign installation;
AC: Air-conditioning installation;
GF: Generating facility installation;
WH: Low voltage unvented electric thermal
storage type water heater installation
CD: Connection / disconnection of electricity
supply to / from an low voltage electrical
equipment and associated electrical work
on the equipment
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Grade R Electrical Work
1.
Registered electrical workers must have the Grade NS
and WH registration to carry out the neon sign
installation and unvented electric thermal storage type
water heater installation.
2.
Without the Grade NS and WH registration, all Grade A,
Grade B, Grade C and Grade H electrical workers are
not allowed to carry out the neon sign installation and
unvented electric thermal storage type water heater
installation.
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Registration of Electrical Contractor
“Electricity Ordinance” Section 34(1)：
No person shall do business as an electrical contractor or contract to
carry out electrical work unless he is a registered electrical contractor.
“Electricity Ordinance” Section 35(1)：
No person shall employ a person other than a registered electrical
contractor to carry out electrical work.
A person who commits an offence under this section is liable to a fine
of $50000 on a first conviction and a fine of $100000 on a subsequent
conviction for the same offence and in either case is liable to
imprisonment for 6 months.
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Registration of Electrical Contractor
Unless a registered electrical contractor, no person (including
registered electrical worker) shall contract to carry out electrical work,
although the electrical work is subcontracted by a registered electrical
contractor or is going to be subcontracted to a registered electrical
contractor.
Owner
Non-REC
Non-REC
s34(1), s35(1)
Non-REC
s34(1)
REC
REC
Non-REC
REC
s35(1)
s34(1)
REC
s34(1)
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Responsibilities of REW
As a registered electrical worker, you have to:
1.
Carry out electrical work in compliance with the requirements of
the Electricity Ordinance and in particular, the requirements of the
Electricity (Wiring) Regulations.
2.
Have your registration certificate with yourself or available at your
workplace while doing electrical work.
3.
Only do the types of electrical work which are entitled by your
registration certificate.
4.
Note that you cannot do business as an electrical contractor or
contract to carry out electrical work unless you are a registered
electrical contractor.
5.
Renew the registration according to the validity period of
registration certificate, otherwise, application would be treated as
a new registration application.
6.
Ensure that safety precautions are taken to prevent danger arising
from electrical wiring work done by you or under your supervision.
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Work Completion Certificate (WR1)
•
A fixed electrical installation shall, after completion (including any
work completed after repair, alteration or addition) and before it is
energised for use, be inspected, tested and certified by a registered
electrical worker to confirm that the requirements of the Ordinance
have been met.
•
The Work Completion Certificate (WR1) shall be duly completed and
signed by the registered electrical worker who carried out the tests
and inspections, and submit to his registered electrical contractor for
endorsement and keeping record for at least five years.
“Work Completion Certificate” is a statutory requirement.
Whatever it is included in contract or not, registered electrical
workers and registered electrical contractor must complete and
endorse the “Work Completion Certificate”.
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Work Completion Certificate (WR1)
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Where a fixed electrical installation is divided into more than one
part, the individual parts need not be inspected, tested and certified
by the same registered electrical worker.
A single certificate in a form specified by the Director may be issued
and certified by a registered electrical worker to cover a number or
all of the individual parts, as long as he has received the appropriate
certificates certified by other registered electrical workers for the
individual parts, and is satisfied that the certificates are completed
and signed by a registered electrical worker of appropriate grade.
WR1(A)
WR1(A)
WR1(A)
WR1(A)
WR1
WR1
Work Completion
Work Completion
Certificate
Certificate
WR1(A)
WR1(A)
WR1(A)
WR1(A)
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Periodic Test Certificate (WR2)
•
Owners of fixed electrical installations shall arrange its
installations to have inspected, tested and certified
periodically. Registered electrical worker shall conduct
the inspection and testing in accordance with the
technical requirements stipulated in the Electricity
(Wiring) Regulations, and certify that the requirements
of the Ordinance have been met.
•
The registered electrical worker who carried out the
inspection and testing shall submit the duly completed
Periodic Test Certificate (Form WR2) to his registered
electrical contractor for endorsement and further
submission to EMSD for endorsement.
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Periodic Test Certificate (WR2)
•
To prevent danger to the electrical workers and impact to
the electricity supply to buildings arising from electrical
work, it is required to disconnect the power supply from
power company during the periodic inspection & testing
work for the main switchboard, which is connected to
power company’s transformer.
•
With effect from 1 December 2011, WR2 of the main
switchboard shall be submitted with documentary proof
on temporary disconnection of power supply from power
company for checking by EMSD.
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Safety Practices in Electrical Work
Take precautionary measures to prevent danger
arising from electrical wiring work done by him or
under his supervision.
Code 4 of the Code of Practice for the Electricity
(Wiring) Regulations, detailed the safety issues and
precautionary measures workers should adopt during
the electrical work.
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Safety Practices in Electrical Work
1.
2.
3.
4.
5.
6.
The scope of work and relevant circuit should be checked before
starting any electrical work.
Suitable lighting and adequate illumination should be provided for
the workplace.
The condition of tools and instruments should be checked before
carrying out electrical work.
Check the surrounding area for any energized metal using
proper instruments
Suitable and adequate personal protective equipment and proper
tools should be used (Appendix 14 of the CoP).
The circuit / equipment under maintenance should be isolated as
far as practicable and tested to be de-energized before work.
The relevant isolator should be locked out. A suitable warning
notice should be placed close to the isolator.
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Safety Practices in Electrical Work
7.
8.
9.
10.
11.
The circuit / equipment to be worked on should be checked to
ensure that it is dead. If live work is unavoidable, adequate
precautions and risk assessment should be taken according to
the Appendix 15 of the CoP.
Keep hands away from any circuit or equipment that are not
working on.
The requirements stated in procedures and check lists should be
followed.
Electrical installations, including but not limited to those newly
installed, maintained, repaired or tripped under fault conditions,
should be properly inspected and tested prior to energization.
To avoid misunderstanding in conducting switching of MCB,
MCBs in the same distribution board should be installed in the
same orientation.
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Safety Precautions on HV work
1.
Appoint a responsible person to take charge of the operation and
maintenance work of the installation.
2.
No person, except a responsible person or a person having the
permission of the responsible person, should enter a H.V.
enclosure, and where danger may exist, no one should enter a
H.V. enclosure unaccompanied.
3.
Every H.V. enclosure, except where manned, should be kept
locked. The keys should be properly kept in accordance with
Code 4H(2) of CoP.
4.
Guidelines provided in Code 4H of CoP should be followed in
conducting electrical work on H.V. installations.
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Restrictions of Live Work
Live work should not be performed unless:
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It is necessary in the interests of safety, whether or not electrical
safety, for the work to be performed while the electrical equipment is
energised (e.g. work on hospital equipment); or
•
a supply of electricity is essential for the proper performance of the
electrical measurement (e.g. testing and fault finding); or
•
there is no reasonable alternative to perform the electrical work by
live work (e.g. widespread outages of a building would occur if live
work is not allowed); or
•
it is justified and approved by the registered electrical worker,
registered electrical contractor and owner of the installation (e.g.
serious public inconvenience would arise from isolating the circuits).
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Requirements on Live Work
Where live work is unavoidable, adequate precautions should be taken
to avoid danger for work involving the handling of energised parts or
working within touchable distance, direct or indirect, of energised parts
at low voltage. The following precautions are to be taken:
(i)
work on energised low voltage electrical equipment should be
done only by registered electrical workers who are by virtue of
knowledge and training competent to be allowed to carry out live
work;
(ii)
prior risk assessment should be carried out by the registered
electrical contractor, registered electrical worker or a registered
safety officer on the performance of the live work (sample
provided);
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Requirements on Live Work
(iii) Personal protective equipment (including insulating gloves, safety
shoes and insulating mat) and testing equipment appropriate to
the performance of the live work should be properly used by the
person performing the electrical work;
(iv) Screen or other means to avoid danger from inadvertent contact
with energised conductors should be provided;
(v)
Fixing of warning notices for repair, barriers and screens;
(vi) The duration and the extent of the live work should be minimized
as far as practicable; and
(vii) The isolation point of the electricity supply for the subject electrical
equipment has been clearly identified.
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Risk Assessment Report
Registered Electrical Worker,
Registered Electrical Contractor, or
Registered Safety Officer
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End
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