BS EN 61008-1:1995 Specification for residual current operated circuit-breakers without integral overcurrent protection for household and similar uses (RCCBs) - Part 1. General rules
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This International Standard applies to residual current operated circuit-breakers functionally independent of, or functionally dependent on, line voltage, for household and similar uses, not incorporating overcurrent protection (hereafter referred to as RCCB's), for rated voltages not exceeding 440 V a.c. and rated currents not exceeding 125 A for fixed installation, intended principally for protection against shock-hazard.
These devices are intended to protect persons against indirect contact, the exposed conductive parts of the installation being connected to an appropriate earth electrode. They may be used to provide protection against fire hazards due to a persistent earth fault current, without the operation of the overcurrent protective device.
RCCB's having a rated residual operating current not exceeding 30 mA are also used as a means for additional protection in case of failure of the protective means against electric shock.
This standard applies to devices performing simultaneously the functions of detection of the residual current, of comparison of the value of this current with the residual operating value and of opening of the protected circuit when the residual current exceeds this value.
NOTES
1. The requirements for RCCB's are in line with the general require- ments of IEC 755. RCCB's are essentially intended to be operated by uninstructed persons and designed not to require maintenance. They may be submitted for certification purposes.
2. Installation and application rules of RCCB's are given in IEC 364.
Special precautions (e.g. lightning arresters) may be necessary when excessive overvoltages are likely to occur on the supply side (for example in the case of supply through overhead lines) (see 364-4-443)
NOTE 4 - For RCCB's having a degree of protection higher than IP20 special constructions may be required.
Particular requirements are necessary for
- Residual current operated circuit-breakers with integral overcurrent protection (see IEC 1009);
- RCCB's integrated in one unit with a socket-outlet or designed exclusively for being associated
locally with a socket-outlet in the same mounting box.
NOTE 5 For the time being, for RCCB's integrated in one unit with a socket-outlet or designed exclusively for being associated locally with a socket-outlet in the same mounting box the requirements of this standard in conjunction with those of IEC 884-1 may be used as far as applicable.
The requirements of this standard apply for normal environmental conditions (see 7.1). Additional requirements may be necessary for RCCB's used in locations having severe environmental conditions.
RCCB's including batteries are not covered by this standard.
BS EN 61008-1:1995 Specification for residual current operated circuit-breakers without integral overcurrent protection for household and similar uses (RCCBs) - Part 1. General rules
