Building Code of the Philippines(1)

M b from street corners where hydrants are located at

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Unformatted text preview: to the general public and to employees not authorized to approach conductors and other current-carrying parts of electric supply lines, such parts shall be arranged so as to provide adequate clearance from the ground or other space generally accessible, or shall be provided with guards so as to isolate them effectively from accidental contract by such persons. 4.3 Ungrounded metal-sheathed service cables, service conduits, metal fixtures and similar non-current-carrying parts, if located in urban districts and where liable to become charged to more than 300 volts to ground, shall be isolated or guarded so as not to be exposed to accidental contact by unauthorized persons. As an alternative isolation or guarding noncurrent-carrying parts shall be solidly or effectively grounded. 4.4 Clearance of wires from building surface shall be not less than those required in Table II. TABLE II. Clearances of Supply Conductors from Buildings (1) For spans 0 - 45 M, the clearances shall be as given in Table II. VOLTAGE OF SUPPLY CONDUCTORS IN METERS HORIZONTAL CLEARANCE CLEARANCE VERTICAL 300 TO 8,700 volts 1.0 2.5 More than 8,700 to 1,500 volts 2.5 2.5 More than 15,000 to 50,000 volts 3.0 3.0 Exceeding 50,000 volts 3.0 plus 10 mm 3.0 plus 10 mm per Kv in excess per Kv in excess (2) 4.5 Where the span length exceeds 45 M the increased clearances required by Rule 232, B, 1 of the PEC shall be provided. Supports over buildings. Service-drop conductors passing over a roof shall be securely supported by substantial structure. where practicable, such supports shall be independent of the building. 5. Conductors Passing By or Over Buildings 5.1 Minimum Clearances. Unguarded or accessible supply conductors carrying voltages in excess of 300 volts may be run either beside or over buildings. The vertical or horizontal clearance to any building or its attachments (balconies, platforms), etc.) shall be as listed below. The horizontal clearance governs above the roof level to the point where the diagonal equals the vertical clearance requirement. This rule should not be interpreted as restricting the installation of a trolley contact conductor over the approximate center line of the track it serves. (See Fig. 1) 5.2 Guarding of Supply Conductors/Supply Conductors of 300 volts or more shall be properly guarded by grounded conduit, barriers, or otherwise, under the following conditions: 1) Where the clearances set forth in Table II above cannot be obtained. 2) Where such supply conductors are placed near enough to windows, verandas, fire escapes, or other ordinarily accessible places within the reach of persons. NOTE: Where the required clearances cannot be obtained, supply conductors shall be of Grounded Metallic Shield, Jacketed Primary Cables groups or bundled and supported by grounded messenger wires. Table III. Minimum Clearance in Any Direction From Line Conductors to Supports, and to vertical or Lateral Conductors, Span or Guy Wires Attached to the Same Support (All volta...
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This note was uploaded on 09/22/2013 for the course ARIDBE AR taught by Professor Any during the Fall '12 term at Mapúa Institute of Technology.

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