Marelex Electrical - Switchboard Manufacturer

Marelex Electrical - Switchboard Manufacturer Australia's premium Switchboard and Control Panel manufacturer for 30 years and counting. Council, Go

Marelex is an Australian owned and operated Electrical Engineering company that as been in operation for 30 Years. At Marelex we enjoy the challenges of solving Electrical Engineering problems with and for our customers. We can advise on and manufacture electrical equipment to suit your needs. Marelexmaster electricians member Electrical is a member of Master Electricians. Marelex is Austrliaโ€™s pr

emium Switchboard and control panel manufacturer. We only use quality renowned brands with outstanding performance for Switch Gear, Motor Control, Timers and Relays. Marelex uses mainly Aluminium sheet metal with more support, so our custom switchboards are not flimsy, require no maintenance or painting and will last a lot longer than cheap powder coated mild steel switchboards. We work closely with our customers to determine the best layout and design prior to manufacture, thereby reducing time spent with onsite modifications which results in reduced project outlay.

15/12/2025

Is it time for switchboard electricians to be recognised as a dedicated trade stream? Nevill Williams, General Manager, Specialist Electrical Solutions , and member of NESMA Queensland thinks so, and provides his thoughts on what we can all do to achieve this. Australiaโ€™s switchboard manufacturing...

13/12/2025
26/11/2025

๐Ÿ”น ๐Ÿ. ๐‹๐จ๐š๐ ๐‚๐š๐ฅ๐œ๐ฎ๐ฅ๐š๐ญ๐ข๐จ๐ง
๐‘ช๐’๐’๐’๐’†๐’„๐’•๐’†๐’… ๐‘ณ๐’๐’‚๐’… = ฮฃ(P).
๐‘ซ๐’†๐’Ž๐’‚๐’๐’… ๐‘ณ๐’๐’‚๐’… = Connected Load ร— Demand Factor
๐‘ซ๐’Š๐’—๐’†๐’“๐’”๐’Š๐’‡๐’Š๐’†๐’… ๐‘ณ๐’๐’‚๐’… = Connected Load ร— Diversity Factor
๐‘จ๐’‘๐’‘๐’‚๐’“๐’†๐’๐’• ๐‘ท๐’๐’˜๐’†๐’“ (๐‘บ): S = โˆš(Pยฒ + Qยฒ)
๐ค๐•๐€ = kW / PF
๐Ÿ”น ๐Ÿ. ๐‚๐ฎ๐ซ๐ซ๐ž๐ง๐ญ ๐‚๐š๐ฅ๐œ๐ฎ๐ฅ๐š๐ญ๐ข๐จ๐ง.
๐‘ช๐’–๐’“๐’“๐’†๐’๐’• (๐‘ฐ): (a) I = P / (V ร— PF) (Single Phase)
(b) I = P / (โˆš3ร— V ร— PF) (Three Phase)
๐’Œ๐‘ฝ๐‘จ ๐‘ฉ๐’‚๐’”๐’†๐’…: (a) I = (kVA ร— 1000) / V (Single Phase)
(b) I = (kVA ร— 1000) / (โˆš3 ร— V) (Three Phase)

๐Ÿ”น ๐Ÿ‘. ๐‚๐š๐›๐ฅ๐ž ๐’๐ž๐ฅ๐ž๐œ๐ญ๐ข๐จ๐ง.
๐‘ฉ๐’š ๐‘ช๐’–๐’“๐’“๐’†๐’๐’•: I = P / (โˆš3 ร— V ร— PF)
Select cable > I ร— 1.25 (for safety)
๐‘ฉ๐’š ๐‘ฝ๐’๐’๐’•๐’‚๐’ˆ๐’† ๐‘ซ๐’“๐’๐’‘: Vd = I ร— (L ร— R ร— โˆš3) (for 3ฯ•)
Vdrop% = (Vdrop / V) ร— 100
๐Ÿ’ก Allowable โ‰ค 3% for lighting, โ‰ค 5% for power.

๐Ÿ”น ๐Ÿ’. ๐“๐ซ๐š๐ง๐ฌ๐Ÿ๐จ๐ซ๐ฆ๐ž๐ซ ๐„๐ฌ๐ญ๐ข๐ฆ๐š๐ญ๐ข๐จ๐ง.
๐‘ป๐’“๐’‚๐’๐’”๐’‡๐’๐’“๐’Ž๐’†๐’“ ๐‘บ๐’Š๐’›๐’† (๐’Œ๐‘ฝ๐‘จ) = Total Demand Load (kW) / PF
๐Ÿ’ก Add 10โ€“25% future load.

๐Ÿ”น 5. ๐Ÿ“. ๐‚๐ข๐ซ๐œ๐ฎ๐ข๐ญ ๐๐ซ๐ž๐š๐ค๐ž๐ซ ๐’๐ข๐ณ๐ข๐ง๐ .
MCCB / MCB = Load Current ร— 1.25.

๐Ÿ”น ๐Ÿ”. ๐„๐š๐ซ๐ญ๐ก๐ข๐ง๐  ๐‚๐š๐ฅ๐œ๐ฎ๐ฅ๐š๐ญ๐ข๐จ๐ง.
๐๐ฎ๐ฆ๐›๐ž๐ซ ๐จ๐Ÿ ๐„๐š๐ซ๐ญ๐ก ๐‘๐จ๐๐ฌ = Fault Current / (ฯ€ ร— L ร— โˆšr).
(Basic method โ€“ practical soil resistivity testing used)

๐Ÿ”น ๐Ÿ•. ๐‚๐จ๐ง๐๐ฎ๐ข๐ญ ๐’๐ข๐ณ๐ข๐ง๐ 
๐‚๐จ๐ง๐๐ฎ๐ข๐ญ ๐…๐ข๐ฅ๐ฅ ๐‘๐š๐ญ๐ข๐จ = (ฮฃ cable area ร— 100) / Conduit Internal Area.
๐‘€๐‘Ž๐‘ฅ ๐‘Ž๐‘™๐‘™๐‘œ๐‘ค๐‘Ž๐‘๐‘™๐‘’ = 40%.

๐Ÿ”น ๐Ÿ–. ๐‹๐ข๐ ๐ก๐ญ๐ข๐ง๐  ๐‚๐š๐ฅ๐œ๐ฎ๐ฅ๐š๐ญ๐ข๐จ๐ง.
๐‹๐ฎ๐ฑ = (No. of Fixtures ร— Lamp Lumen ร— Utilization ร— Maintenance) / Room Area.

๐Ÿ”น ๐Ÿ—. ๐’๐จ๐ฅ๐š๐ซ ๐’๐ฒ๐ฌ๐ญ๐ž๐ฆ ๐„๐ฌ๐ญ๐ข๐ฆ๐š๐ญ๐ข๐จ๐ง.
๐’๐จ๐ฅ๐š๐ซ ๐๐š๐ง๐ž๐ฅ ๐’๐ข๐ณ๐ž (๐ค๐–) = Load (kWh/day) / Sun Hours
๐ˆ๐ง๐ฏ๐ž๐ซ๐ญ๐ž๐ซ ๐’๐ข๐ณ๐ž = 1.2 ร— Total Load
๐๐š๐ญ๐ญ๐ž๐ซ๐ฒ ๐€๐ก = (Load ร— Backup Hours) / Battery Voltage.

๐Ÿ”น ๐Ÿ๐ŸŽ. ๐„๐ฌ๐ญ๐ข๐ฆ๐š๐ญ๐ข๐จ๐ง & ๐‚๐จ๐ฌ๐ญ๐ข๐ง๐ .
๐๐ฎ๐š๐ง๐ญ๐ข๐ญ๐ฒ = (Length ร— Number)
๐‚๐จ๐ฌ๐ญ = Quantity ร— Unit Rate.
๐“๐จ๐ญ๐š๐ฅ ๐๐ซ๐จ๐ฃ๐ž๐œ๐ญ ๐‚๐จ๐ฌ๐ญ = ฮฃ(Material + Labor + Overheads + Profit).

๐Ÿ“ ๐‚๐จ๐ง๐ฏ๐ž๐ซ๐ฌ๐ข๐จ๐ง ๐…๐จ๐ซ๐ฆ๐ฎ๐ฅ๐š๐ฌ.
๐ค๐– ๐ญ๐จ ๐ค๐•๐€: kVA = kW / PF
๐ค๐•๐€ ๐ญ๐จ ๐ค๐–: kW = kVA ร— PF
๐‡๐ ๐ญ๐จ ๐ค๐–: kW = HP ร— 0.746
๐ค๐– ๐ญ๐จ ๐‡๐: HP = kW / 0.746
๐ค๐–๐ก: kWh = kW ร— Hours.

๐Ÿงฎ ๐ƒ๐ข๐ฏ๐ž๐ซ๐ฌ๐ข๐ญ๐ฒ & ๐ƒ๐ž๐ฆ๐š๐ง๐ ๐…๐š๐œ๐ญ๐จ๐ซ.
๐ƒ๐ž๐ฆ๐š๐ง๐ ๐…๐š๐œ๐ญ๐จ๐ซ: DF = Maximum Demand / Connected Load.
๐ƒ๐ข๐ฏ๐ž๐ซ๐ฌ๐ข๐ญ๐ฒ ๐…๐š๐œ๐ญ๐จ๐ซ: DivF = Sum of Individual Max / System Max Demand.

๐Ÿ”ฅ ๐„๐ฑ๐š๐ฆ๐ฉ๐ฅ๐ž.
Load = 150 kW @ 415V, PF = 0.9.
1๏ธโƒฃ ๐‚๐ฎ๐ซ๐ซ๐ž๐ง๐ญ: ๐ˆ = 150000 / (1.732 ร— 415 ร— 0.9) = 232 A.
2๏ธโƒฃ ๐‚๐š๐›๐ฅ๐ž ๐ฌ๐ข๐ณ๐ž = 232 ร— 1.25 = 290 A โ†’ 300A cable.
3๏ธโƒฃ ๐๐ซ๐ž๐š๐ค๐ž๐ซ = 232 ร— 1.25 = 290 A โ†’ 300A MCCB.
4๏ธโƒฃ ๐“๐ซ๐š๐ง๐ฌ๐Ÿ๐จ๐ซ๐ฆ๐ž๐ซ = 150 / 0.9 โ‰ˆ 166 kVA + 20% = 200 kVA.

๐‘†โ„Ž๐‘Ž๐‘Ÿ๐‘’!! ๐ป๐‘’๐‘™๐‘๐‘–๐‘›๐‘” ๐‘œ๐‘กโ„Ž๐‘’๐‘Ÿ๐‘  ๐‘ค๐‘–๐‘™๐‘™ โ„Ž๐‘’๐‘™๐‘ ๐‘ฆ๐‘œ๐‘ข ๐‘ก๐‘œ ๐‘”๐‘Ÿ๐‘œ๐‘ค.
Reposted from LinkedIn original by ๐„๐ซ. ๐–.๐€.๐’๐ข๐๐๐ข๐ช๐ฎ๐ž

Call now to connect with business.

20/11/2025

Cutting-Edge Technology in Switchboard Manufacturing

Switchboard manufacturing is advancing significantly with cutting-edge technologies enhancing performance, functionality, reliability, efficiency, and sustainability. This post lists some of the advancements revolutionizing the future of electrical switchboards and what they offer.
For the full post see our website:
https://www.marelexelectrical.com.au/news/

Modular Designs and Prefabrication:
Digital Twin Technology:
IoT Integration:
Smart Connectivity:
Energy Management Systems (EMS):
Advanced Protection Devices:
Sustainable Practices:
Additive Manufacturing (3D Printing):
AI and Machine Learning:
Cybersecurity Measures:

Let me know if there is anything else in the comments.

It was great Last weekend to attend The Annual National Electrical Switchboard Manufacturers Association (NESMA) Confere...
12/11/2025

It was great Last weekend to attend The Annual National Electrical Switchboard Manufacturers Association (NESMA) Conference in Hobart. It was great to catch up with other business owners and had great time exploring different ideas and developments, and the sharing of experiences and information by the other members.
Great displays by this years sponsors and prizes.

Electrical






05/03/2025

Due to the imminent approach of Cyclone Alfred, our office will be closed on Thursday and Friday. Our management and engineering teams will be working remotely during this period.

For your safety, please:

Avoid floodwaters and stay indoors.

If you reside in low-lying areas prone to flooding, consider moving to higher ground until conditions improve.

Follow all official safety advisories and local guidelines.

Stay safe and take care during this challenging time.

19/11/2024

๐ŸŽ„ **Holiday Closure Notice!** ๐ŸŽ

Dear Valued Customers,

We wanted to let you know that Marelex Electrical will be closed for the holiday season from December 23rd, 2024, and will reopen on January 6th, 2025.

We appreciate your support throughout the year and look forward to serving you again when we return.

Wishing you all a joyful and peaceful holiday season! ๐ŸŒŸ

Regards,
Marelex Electrical Team

20/12/2023

๐ŸŽ„ **Holiday Closure Notice!** ๐ŸŽ

Dear Valued Customers,

We wanted to let you know that Marelex Electrical will be closed for the holiday season from December 22nd, 2023, and will reopen on January 15th, 2024.

We appreciate your support throughout the year and look forward to serving you again when we return. Wishing you all a joyful and peaceful holiday season! ๐ŸŒŸ

Warm regards,
Marelex Electrical Team

Marelex Electrical got new front signs.
14/09/2023

Marelex Electrical got new front signs.

14/07/2023

Marelex Electrical is currently seeking an Electrical Fitter for a workshop-based manufacturing position in Lismore. The role will involve the assembly of switchboards and control panels in a workshop environment. These are full-time roles with immediate starts for the right candidates.

What we do:

Marelex Electrical is an Australian family-owned and operated Electrical Engineering company that has been in operation for 30 years. We offer custom-made control and automation products, switchboard and control panel manufacturing, and general domestic electrical services. We also provide qualified technical support.

What we are offering:
โ€ข Competitive hourly rates + Penalties
โ€ข Temp to Perm Position
โ€ข Immediate Start
โ€ข Lismore Based
โ€ข Mon-Fri, no weekend work

What we are looking for:
โ€ข Qualified Electrician.
โ€ข Experience in the Assembly of Electrical Switchboards & Control Panels.
โ€ข Experience with Panel Wiring & Testing.
โ€ข Experience with Hand Tools & Power Tools.
โ€ข Ability to Read and Interpret Electrical Schematics & Drawings.
โ€ข Attention to detail.

If you are interested in this role, please apply now.

Send your resume to [email protected] or [email protected] or contact us at 02 6621 5221

Address

19 Snow Street
Lismore, NSW
2480

Opening Hours

Monday 8am - 4:30pm
Tuesday 8am - 4:30pm
Wednesday 8am - 4:30pm
Thursday 8am - 4:30pm
Friday 8am - 4:30pm

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