Handbook of Electrical Engineering

450 HANDBOOK OF ELECTRICAL ENGINEERING Figure 17.1 Single UPS with a bypass supply and static switches. 17.1.2 Coordination of t ...

UNINTERRUPTIBLE POWER SUPPLIES 451 downstream device and the lower tolerance of the upstream device. If the two cascaded devices ...

452 HANDBOOK OF ELECTRICAL ENGINEERING Radio communication equipment. Emergency generator control panels. Start-up and shut-dow ...

UNINTERRUPTIBLE POWER SUPPLIES 453 Battery chargers have an energy conversion efficiency of about 85% and a typical power factor ...

454 HANDBOOK OF ELECTRICAL ENGINEERING A ‘rule-of-thumb’ guide to the appropriate slow charging current is to divide the ampere- ...

UNINTERRUPTIBLE POWER SUPPLIES 455 However, batteries are best kept ‘working’ otherwise chemical degrading occurs internally and ...

456 HANDBOOK OF ELECTRICAL ENGINEERING If there is a total failure from the main supply then it will usually be necessary to mai ...

UNINTERRUPTIBLE POWER SUPPLIES 457 the better will be the result. At the same time the float charging current should be controll ...

458 HANDBOOK OF ELECTRICAL ENGINEERING References 1.Back-up and discrimination between circuit protective devices.Report of subc ...

18 Miscellaneous Subjects 18.1 Lighting Systems Normal lighting should provide approximately 75% of the total illumination an ar ...

460 HANDBOOK OF ELECTRICAL ENGINEERING All areas in the living quarters. All workshops, stores, cranes and utility areas. Offsh ...

MISCELLANEOUS SUBJECTS 461 When designing a lighting circuit it is customary practice to size the cables so that the farthest la ...

462 HANDBOOK OF ELECTRICAL ENGINEERING Table 18.1. (continued) Location and equipment Illumination level in lux, see Note 1 Loca ...

MISCELLANEOUS SUBJECTS 463 Table 18.1. (continued) Location and equipment Illumination level in lux, see Note 1 Material storage ...

464 HANDBOOK OF ELECTRICAL ENGINEERING White and red lights flashing the Morse letters ‘U’ every 15 seconds as follows: Eclips ...

MISCELLANEOUS SUBJECTS 465 18.2.2.4 Operation and control of lighting systems Navigation lighting systems can be fitted with a d ...

466 HANDBOOK OF ELECTRICAL ENGINEERING In the event of main supply failure the hazard lighting would be supplied from an emergen ...

MISCELLANEOUS SUBJECTS 467 An emergency power supply should provide a minimum of 6 hours duration, and minimum of 3 hours of th ...

468 HANDBOOK OF ELECTRICAL ENGINEERING References 1.IES lighting handbook. Edited by John E. Kaufman. Illumination Engineering S ...

19 Preparing Equipment Specifications 19.1 The Purpose of Specifications The main purpose of preparing a specification for an it ...