BS EN ISO 8849:2021 pdf free

BS EN ISO 8849:2021 pdf free.Small craft — Electrically operated bilge pumps.
4.9 Centrifugal and axial flow pumps shall be capable of operating dry at their design voltage for at least 7 h without creating a fire hazard. Alternatively, a means integral with the pumps shall be provided to shut the pump off automatically to prevent a fire hazard.
4.10 Positive or semi-positive displacement pumps, i.e. those in which the impeller can be in continuous contact with the housing when operating dry, shall be capable of operating dry at their design voltage for at least 5 mm without damage to the impeller or housing and for at least 1 h without creating a fire hazard. Alternatively, a means integral with the pumps shall be provided to shut the pump off automatically to prevent a fire hazard. Information shall be provided in the owners manual cautioning against operating the pump dry for more than 1 mm.
5 Electrical requirements
5.1 Submersible pumps shall have watertight electrical connections, lP 67, in accordance with IEC 60529:2013.
The use of a length of watertight electrical cable sealed at the pump connection is recommended, so that connections to the power supply can be made above the critical bilge-water level.
5.2 Metallic parts of a DC pump housing that can be exposed to contact with bilge water and can become a source of stray current leakage shall have provisions for equipotential bonding conductor connections.
Pumps designed with a double-insulated electrical system, requiring a break in two distinct insulation systems before electrical leakage can reach exposed metallic parts, do not require a bonding connection.
5.3 Bilge pumps shall be protected against continuously locked rotor conditions by
— integral overcurrent protection, or
— overcurrent protection in the circuit of a size to protect the bilge-pump motor,
— being capable of sustaining operation with a locked rotor for 7 h without generating surface temperatures in excess of 150 °C, at an ambient temperature of 60 °C, and without evidence of charring, burning or melting,
— temperatures not exceeding 150 °C when the pump operates at 120 % of nominal voltage in an ambient temperature of 60 °C for 7 h.
5.4 DC bilge pumps shall be capable of withstanding a DC voltage of 500 V for 1 mm without leakage in excess of 1 mA. The test voltage shall be applied between the current-carrying parts and the noncurrent-carrying metal parts. If the pump is internally earthed, the earth connection shall be broken in order to carry out this test.
AC bilge pumps shall be fitted with or supplied by a circuit protected by a residual current device (RCD).BS EN ISO 8849 pdf download.