Electrical installatoins of buildings - Part 5: Selection and erection of electrical equipment - Chapter 55: Other equipment - Section 551: Low-voltage generating sets
551.1 General
551.1.1 Scope
551.1.1.1 This part applies to low-voltage and extra-low voltage installations which incorporate generating sets intended to supply, either continuously or occasionally, all or part of the installation. Requirements are included in this section for installation with the following supply arrangements:
- Supply to an installation which is not connected to the public supply;
- Supply to an installation as an alternative to the public supply;
- Supply to an installation in parallel with the public supply;
- Appropriate combinations of the above.
This part does not apply to self-contained items of extra-low voltage electrical equipment which incorporate both the source of energy and the energy-using load and for which a specific product standard exists that includes the requirements for electrical safety.
Note 1: particular requirements for supplies for safety services are given in IEC 60364-5-56.
Note 2: requirements of the public supply undertaking should be ascertained before a generating set is installed in an installation which is connected to the public supply.
551.1.1.2 Generating sets with the following power sources are considered:
- Combustion engines;
- Turbines;
- Electric motors;
- Photovoltaic cells;
- Electrochemical accumulators;
- Other suitable sources.
551.1.1.3 Generating sets with the following electrical characteristics are considered:
- Mains-excited and separately excited synchronous generators;
- Mains-excited and self-excited asynchronous generators;
- Mains-commutated and self-commutated static inverters with or without by-pass facilities.
551.1.1.4 The use of generating sets for the following purposes is considered:
- Supply to permanent installations;
- Supply to temporary installations:
- Supply to portable equipment which is not connected to a permanent fixed installation.
551.1.2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated references, subsequent amendments to (excluding amending errors in the text), or revisions of, any of these publications do not apply. However, all parties coming to an agreement according to this standard are encouraged to research whether the latest edition of the normative document is applicable. For undated references, the latest edition of the normative document applies.
GB 14821.1 - 1993 Electrical Installations of Buildings Protection against Electric Shock (idt IEC 60364-4-41: 1992)
GB 16895.3 - 1997 Electrical Installations of Buildings - Part 5: Selection and Erection of Electrical Equipment - Chapter 54: Earthing Arrangements and Protective Conductors (idt IEC 60364-5-54: 1980)
IEC 60364-4-46 Electrical Installations of Buildings - Part 4: Protection for Safety - Chapter 46: Isolation and Switching
551.2 General Requirements
