Main Switches Clause Samples
Main Switches. Each switch shall have a rated normal current of 630 A. Each switch equipment shall have a rated short-circuit making capacity and short-t time rating equivalent to 1500 MVA at 33 KV. The rated short-circuit making capacity and rated short-time current shall apply when operated to the “ON” and “Earth ON” positions. The operating mechanisms and inter locks shall be in accordance to the ENA 41-12 as appropriate. Testing facilities shall be provided for carrying out test on the feeder connected to the switch. Each switch shall be complete with cable box suitable for accepting cable with (300-500) mm2 cross-sections, Al \ XLPE, 3/single cores 33 KV, and and 3 core 33kv cables having cross section of (3x120-3x300) mm2 AL, XLPE.
Main Switches. Air break switches, disconnectors and MCCB's shall be used as appropriate. They shall be designed and rated in accordance with IEC 60408 and IEC 60947-2 as appropriate for the LV system symmetrical fault rating, and shall be capable of breaking rated load current. Interlocking shall be provided to prevent access to the interior of the unit unless in the "off" position. Padlocking facilities shall be provided to enable the device to be locked in the "off" position and also, where applicable, in the "earth" or "test" positions. The position of contacts shall be externally visible. Alternatively positively linked externally visible mechanical indication for the "on", "off" and, where applicable, "earth" positions may be provided subject to full details being submitted and approved by the Engineer. Fuse switches and switch fuses may be used only with the approval of the Engineer. The maximum size of fuse to be used in a fuse switch or switch fuse shall be indicated on the rating plate.