Electrical LT Panel

The LT Panel or Switch Board shall be preferably factory fabricated and of the approved manufacturer.










The switchboard shall be fixed such that there shall be clear space of either less then 230 mm  or more then 762 mm in width behind the switchboard measured from the farthest outstanding part of any attachment of conductor and more then 1000 mm in width in front of the panel. There shall be a passage way from either end, both in front of or behind the panel, clear to height of at least 1829 mm.

No apparatus shall project beyond and edge of the panel. No switch body shall be mounted within 25 mm of any edge of the panel and no holes, other then meant for fixing the panel shall be drilled within 13 mm of the edge of the panel.

The various live parts shall be effectively screened by barriers of non- hygroscopic, non-inflammable insulating material or shall be so spaced chat an arc cannot be maintained between such parts and earth.

All items of switch gear shall be readily accessible and all connections including those to instruments and apparatus, easily traceable.

The switch gear shall be as arranged that fuse are not '' alive'' when the switch is in the ''off '' position.

No fuse other than those in instruments  circuit shall be fixed at the back or behind a panel.

The panel shall be painted  both inside with one coat of anti-rust paint and two coats of approved synthetic enamel paint by spraying before erection.

When a board is connected to voltage higher then 250 V, all the terminals or leads of apparatus mounted on it shall be marked in the following colours to indicate the different poles or phases to which the apparatus or its different terminals may have been connected.

Alternative current - Three phases -Red, Yellow and Blue.                                                                          Neutral - Black                                                                                                                                              Direct Current -  Two outer wire --Read & Blue.                                                                                          Neutral -- Black.

When there are more than one switch gear on a panel or more then one main panel int he building, each panel shall be marked permanently and clearly indicating the section of the installation controlled by it as directed by Engineer Incharge. The main switch shall be marked as such permanently. 

A danger Notice Plate shall be provided on LT Switch Panel.

There shall be a booklet having internal wiring diagram showing details of the connections to facilitate in the maintenance.

The grouting of the LT  Switch Panel should be carried out ass per direction of Engineer Inchargr considering the situation of the site.

Panel has many types - 1)  LCP   --  Light Control Panel.                                                                                                                  2)  PFCP  --  Power Factor Control Panel.                                                                                                    3)  MCC  --  Motor Control Center.                                                                                                              4)  PCC   --  Power Control Center.                                                                                                              5)  VFD   --  Variable Frequency  Drive

Mainly use of Circuit Breaker  Air Circuit Breaker (ACB) &  Molded Case Circuit Breaker  (MCCB).
















Back side of panel


Location: United States

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