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CPD Talk for Registered Electrical Worker Module 1 Statutory and Safety Requirements 1 v201309 Content • • • • Electricity Ordinance (EO) Registration of electrical worker and electrical contractor Responsibilities of registered electrical worker and registered electrical contractor Electrical work safety practices 2 v201309 Electricity Ordinance (EO) Major subsidiary regulations Electricity (Registration) Regulations Registration of: Electricity Ordinance (Cap. 406) • Electrical workers • Electrical contractors • Generating facilities 3 v201309 Electricity Ordinance (EO) Major subsidiary regulations Electricity (Registration) Regulations Electricity (Wiring) Regulations Electricity Ordinance (Cap. 406) • Technical requirements • Safety requirements 4 v201309 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) 5 v201309 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. 6 v201309 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 7 v201309 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. 8 v201309 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 9 v201309 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 10 v201309 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 11 v201309 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 12 v201309 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 13 v201309 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 14 v201309 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 15 v201309 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. 16 v201309 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. 17 v201309 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) 18 v201309 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. 19 v201309 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”. 20 v201309 Work Completion Certificate (WR1) • • 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) 21 v201309 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. 22 v201309 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. 23 v201309 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. 24 v201309 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. 25 v201309 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. 26 v201309 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. 27 v201309 Restrictions of Live Work Live work should not be performed unless: • 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). 28 v201309 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); 29 v201309 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. 30 v201309 Risk Assessment Report Registered Electrical Worker, Registered Electrical Contractor, or Registered Safety Officer 31 v201309 End 32 v201309