Current Rating for Copper Busbar

The following table shows current rating for different size of busbar. This information is very crucial especially in designing the busbar size for Electrical Switchboard.

(A) Main Horizontal & Vertical Copper Busbar Size

Item	Busbar Size	Rating (Ampere)
1	1 x 3 mm x 25 mm	100
2	1 x 5 mm x 25 mm	160
3	1 x 6 mm x 25 mm	200
4	1 x 6 mm x 30 mm	250
5	1 x 6 mm x 40 mm	300
6	1 x 10 mm x 30 mm	400
7	1 x 10 mm x 40 mm	500 - 600
8	1 x 10 mm x 50 mm	700
9	1 x 10 mm x 55 mm	800

 

(B) Main Horizontal Earth Busbar Size

Item	Busbar Size	Rating (Ampere)
1	1 x 3 mm x 25 mm	Below 800

 

(C) MCCB Line & Load Cable Size (BS 6004: 1984,450/750 V)

Item	Busbar Size	Rating (Ampere)
1	1 x 2.5 mm	6 – 16
2	1 x 4.0 mm	20
3	1 x 6.0 mm	30 – 32
4	1 x 10 mm	40
5	1 x 16 mm	50 – 63
6	1 x 25 mm	70 – 90
7	1 x 35 mm	100
8	1 x 50 mm	125 – 150
9	1 x 70 mm	175 – 200
10	1 x 95 mm	225 - 250

Requirement on Fireman Switch

A Fireman’s switch is an electrical isolation switch located within a staircase enclosure to permit the disconnection of electrical power supply to the relevant floor or zone served. In England, it is code that every floor or zone of any floor with a net area exceeding 929 square metres shall be provided with a switch. The switch is of a type similar to the firemen's switch specified in the current edition of Institution of Electrical Engineers Regulations then in force. These switches are most commonly found on retail premises nearby to illuminated neon and LED signage.

What you need to know on Fireman Switch?

1.  The most important is designer should consult with local authority-fire department on exact requirement before establish design on fireman switch. The requirement may differ between state or country.
2. Red in Color
3. The switch should be placed in a conspicuous and accessible location, not more that 2.75m from finish floor level.
4. The fireman switch should be outside and adjacent to the installation for external installations and i the main entrance of a buildings for interior installations.

Fireman switch shall be clearly labeled as accordance to its purpose/which MSB,DBand Electrical panel to be isolated. Photo below showing how fireman isolate the power supply from fireman switch. One of the manufacturer supply fireman switch is ABB Product.

Capacitor Bank In MSB

The purpose of installing the capacitor bank is to counter the resistive load (KVAR) in the electrical system. By doing so, the power factor can be maintain to your required value and not to mentioned, it will save you lots of dollars as well as few more advantages by maintaining the power factor.

In this post, i don't want to write much on designing the capacitor bank. We go for basic, how capacitor bank look likes? Where to install? How the connection suppose to be?

 

These photos showing standard installation of Capacitor bank in MSB. One compartment of the switchboards panels are reserved for capacitor bank installation. The sizing/capacity of capacitor bank to be used and how many numbers are required will be covered in sizing capacitor bank.

Water Fountain Night Show

These photos were taken during Testing and Commissioning of water fountain system in front of Sultan Abdul Halim Airport, kedah Malaysia. The lightings area arranged in such a way to synchronize with water shoot out from nozzle jet.






   


How to install water jet and lighting son that you can get the colorful water flying in the air? Check the photo below...

Installation Method for cable

The followings are among the methods commonly adopted for cable installation. The choices of the method is depend on a few aspects such as drawing, space, constraint and materials available.


A1 - Insulated single core conductors in conduit in a thermally insulated wall

A2 - Multicore cable in conduit in a thermally insulated wall

This method also applies to single core or multicore cables installed directly in a thermally insulated wall (use methods A1 and A2 respectively), conductors installed in mouldings, architraves and window frames.

• B1 - Insulated single core conductors in conduit on a wall
• B2 - Multicore cable in conduit on a wall

This method applies when a conduit is installed inside a wall, against a wall or spaced less than 0.3 x D (overall diameter of the cable) from the wall. Method B also applies for cables installed in trunking / cable duct against a wall or suspended from a wall and cables installed in building cavities.

C - Single core or multi-core cable on a wooden wall

This method also applies to cables fixed directly to walls or ceilings, suspended from ceilings, installed on unperforated cable trays (run horizontally or vertically) and installed directly in a masonry wall (with thermal resistivity less than 2 K.m/W).

• D1 - Multicore or single core cables installed in conduit buried in the ground
• D2 - Multicore or single core cables buried directly in the ground

E - Multicore cable in free-air

This method applies to cables installed on cable ladder, perforated cable tray or cleats provided that the cable is spaced more than 0.3 x D (overall diameter of the cable) from the wall. Note that cables installed on unperforated cable trays are classified under Method C.

F - Single core cables touching in free-air

This method applies to cables installed on cable ladder, perforated cable tray or cleats provided that the cable is spaced more than 0.3 x D (overall diameter of the cable) from the wall. Note that cables installed on unperforated cable trays are classified under Method C.

G - Single-core cables laid flat and spaced in free-air

This method applies to cables installed on cable ladder, perforated cable tray or cleats provided that the cable is spaced more than 0.3 x D (overall diameter of the cable) from the wall and with at least 1 x D spacings between cables. Note that cables installed on unperforated cable trays are classified under Method C. This method also applies to cables installed in air supported by insulators.