Saturday, February 27, 2016


Indicator Lamps 

Indicating Lamps Selection Procedure for Electrical Distribution and Controlling Panel

Indicating lamps directly not affect electrical distribution network, means power not go breakdown; but it make sure the status of the electrical circuit or a part of that. Sometime it becomes prime issue for safety-induction.

What Should Become in Consideration to Select Indicator Lamps

First of all lifetime of indication lamps is an important issue to select lamps, not because of saving price but because of avoid hassle to replace dead lamp by new one.
So, it is expected, all new indicators should have a minimum continuous burning guaranteed life of 10,000 hours, at their rated voltage.
Indicators should be of the filament lamp, LED or neon type indicator lamps also may use, depends on user choice. It might considerable to LED indicators, should operate at not less than 20mA and red LED indicators should be of the high brightness types.
Indicator lamps placement should be easily replaceable from the front of the panel and be adequately ventilated.
The lamps should be clear and should fit into a standard form of lamp holder. The rated lamp voltage should be ten percent in excess of the auxiliary supply voltage, whether AC or DC. Alternatively, low voltage lamps with series resistors will be acceptable; however resistors should be dimensioned to avoid damage due to heat.

Indicator Lamps Colour Selection

To visualize indicator lamps properly is very important, less glowing or colour merging with vicinity may confuse to identify the status of electrical operation. Significantly colour selection of indicator lamps should comply the standard.
The lamp glasses should comply with BS 1376 and BS 4099 or equivalent National Standard and should be in standard colours, Red, Green, Blue, White and Amber.
The colour should be in the glass and not an applied coating and the different coloured glasses should not be interchangeable.
Transparent synthetic materials may be used instead of glass, provided such materials have fast colours and are completely suitable for use in tropical climates.


Indicator Lamps Energized Voltage

The prime purpose to presence of indicator on electrical panel to visualize presentation of electricity presence or absence. So, it must not be indicator lamp energized by same energy source.
Normally energized indicating lamps be energized from the station Low Voltage AC supply.
Lamps and relays incorporated in alarm fascia equipment should be arranged for normal operation from the station battery, subject to the approval of the Engineer.
Lamp test facilities should be available so that all lamps on one panel can be tested simultaneously by operation of a common push-button. Where alarm facias are specified, all alarm and monitoring indications should be incorporated in the facia.

Where specified every circuit breaker panel should be equipped with one red and one green indicator lamp, indicating respectively circuit closed and circuit open and an amber lamp for indicating auto-trip.
Where specified in the lines of mimic diagrams, indicating lamps may be of the three-lamp single-aspect type.
All lamps should be renewable from the front of panels without the use of special tools.
The variety of indicating lamps provided should be rationalized to reduce maintenance and spares requirements.

1 comment:

  1. I know your expertise on this. I must say we should have an online discussion on this. Writing only comments will close the discussion straight away! And will restrict the benefits from this information.


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