ISAS

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Switchboard
Switchboard Overview


Features

ISAS manufacture the FORM 4 Series switchboard system to the requirements of AS3439 FORM 4. The system can accommodate circuit breakers, fuse switch units, distribution chassis and motor starter modules etc., to form a complete assembly with the following features:

  • Compact design provides flexibility and reliability.
  • Competitively priced with the highest standard of quality.
  • Fast manufacturing time with standard components held in stock.
  • Available in ripple finish Light Grey RAL 7032 and Grey N42 or special colour upon request.
  • Type tested for Arc fault containment to AS3439 Appendix E.
  • Ease of cable termination and entry in the generous vertical cable zones.
  • Front or rear cable connections, top or bottom cable entry.
  • Back to back or single sided MCC and MSB designs.
  • Demountable design for easy maintenance and additions.
  • Starter module connection via a robust 3 or 4 pole insulated bus plug and busbar system.
  • Earthing contact for the cell is via a full length earth bar and earth contact is made on the cell prior to the unit being connected to the main busbar.
  • Advanced computerised design tools and drafting.


Type Tests

The FORM 4 system has been tested by Testing and Certification Australia for:

  • Verification of segregation form 3A, 3B and form 4.
  • Verification of dielectric strength.
  • Verification of temperature rise on main bars, feeders, joints and starter modules.
  • Verification of short circuit capacity on the main and vertical busbar systems for 63kA for 1 second and 50kA for 1 & 3 seconds. This test applies to busbar current rating from 800 Amps through to 6000 Amps in various increments.
  • The following AETC certificates and reports are available:
  • -Temperature rise Report No. 66222.A
  • -Short circuit testing Report No. 66222.1B, 66222.2B
  • -Arc fault containment Appendix EE Report No. 66222.3.B
  • Degree of protection: Standard is IP53 and its compliment IP range of switchboard products is available in IP66.


Construction

The Modular system is manufactured from 2.5mm mild steel frame and accurately fabricated 2.00mm and 1.6mm standard components. The cubicle parts, doors and covers are formed from the highest grade zincanneal sheet steel, that when assembled forms a rigid robust structure of uniform appearance. The modular doors are lift off design and seal on a neoprene gasket around all edges. The doors are latched by chrome plated locks with stainless steel tongues or with plated pan head screws. The assembly sits on a 75mm or 100mm galvanized channel base. Lifting facilities are provided at the top with certified lifting eyes and/or through the base as requested.

Paint Finish and Colour

The FORM 4 system has a very tough ripple powder coat finish providing aesthetic appearance. The standard finishes are Grey N42 and Light Grey RAL 7032. Special colours are completed to order.

Technical Description

The Modular FORM 4 system is available in the following frame sizes:

  • Widths (Opening): 300mm, 400mm, 500mm, 600mm, 800mm and 1100mm.
  • Heights: 1400mm, 1800mm, 2000mm and 2200mm.
  • Depths: 200mm, 300mm, 400mm, 600mm, 800mm and 1000mm.
  • Special frame sizes can be made to order.


Construction can be Mild steel, Aluminium, Stainless Steel or PGI. A 75mm or 100mm channel iron base is standard. 
The standard heights for Motor Control Centres are 9, 10 or 11 modules(1980mm plus base). A module height is 190mm.

Compartments - fully segregated compartments can be formed in various sizes:

  • 300mm, 400mm, 500mm, 600mm or 800mm wide.
  • Plug in module heights ranging from 1 through 6 modules.

 

Cable zones - A cable zone may be located on either side of the drive tier. Cable zones are available in 200mm, 300mm, 400mm or 500mm widths and provide clear front and rear access.

Starter cell sizes and ratings:

Tier Width = 300mm

Module Size

Rating (kW)

CFS

MCCB

 

DOL

Star/Delta

(A)

(A)

1

15

-

100

63

1.5

22

7.5

200

160

2

45

15

250

250

3

90

55

400

400


Tier Width = 500mm

Module Size

Rating (kW)

CFS

MCCB

 

DOL

Star/Delta

(A)

(A)

1

22

7.5

160

125

1.5

45

15

250

250

2

75

30

400

400

3

150

75

630

630


Notes:
-Above ratings are based on a 25 ºC rise over a 35 ºC ambient. The above stated ratings are maximums based on typical CFS, MCCB, Contractors, Thermal O/L relays etc. The type and number of auxiliary equipment may affect module ratings.

The Switchboard can be designed for:

  • single side top entry.

  • single side bottom entry.

  • double sided top and bottom entry.


Starter module connection via a robust 3 or 4 pole insulated bus plug and tinned vertical busbar system. Earthing contact for the cell is via a full length earth bar and earth contact is made on the cell prior to the unit being connected to the busbars.

Control wiring to each module can be via plug-in 10 or 20 pin reliable connectors or wired to terminals.

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