Distribution Box

Manhua Electric: Your Professional Distribution Box Supplier!

Our staffs of Manhua Electric have over thirty years of experience in the production and export of electrical products. Our main products include switchboxs, automatic transfer switches (ATS), circuit breakers, contactors, lightning arresters, photocells and timers. Starting in 2017, we started operating a warehousing center in Chicago, USA. As a supplier of United Nations tender projects, we have been participating in power construction projects in overseas markets.

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Good Reputation
We have cooperated with partners in Saudi Arabia, Kuwait, Thailand, Vietnam, Japan and other countries, and have gained their trust because of the excellent quality of our products.

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Quality Guaranteed
We ensure that all production processes are carried out in accordance with the ISO9001 system, and all products have passed CE certification, and some products have also passed UL and VDE certification.

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High Productivity
We have our own standard factory buildings and warehousing centers, which can supply electrical products in large quantities and independently complete all work from raw materials, product production, assembly to packaging.

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Warm Service
We sincerely welcome all customers who come to inquire about our products, and provide professional product knowledge and technical guidance, as well as complete warranty and after-sales services.

Pole Mount Distribution Box

What is Distribution Box?

A distribution box, also known as a distribution box, panel box, breaker panel, or electric panel, is a device that distributes electrical power. It's the central electrical supply system for a building or property, takes the electrical power from the main power line and distributes it throughout the home or building with which it's used. The primary functions also include power generation, transmission and distribution.

Features of Distribution Box

Wide Used

Made of die-cast aluminum, fiberglass and stainless steel housings, our distribution boxes are waterproof and explosion-proof and suitable for use in any hazardous area, especially in the chemical, refining and oil exploration industries.

Quick Install

These electrical boxes are wall-mounted with screws and come pre-wired and assembled inside. Users only need to drill holes in the wall and fix it with screws, plug in the power cord according to the wiring diagram and it is ready to use.

High Security

The socket boxes of these distribution boxes are equipped with waterproof sockets, and each socket is protected by a circuit breaker to ensure the safety of the electrical equipment used in each socket.

Easy to Use

They are equipped with a transparent cover that allows the operator to understand its operating parameters and easily check the status of the circuit breaker without opening it.

Application of Distribution Box

Electrical Distribution

As the name suggests, the power distribution box is primarily responsible for evenly distributing the electrical supply from the main supply line throughout the house. The electrical flow is divided by the power distribution box upon entering the household wirings from the main supply line. It is evenly transferred to the subsidiary connections and miniature circuits across the line.

Electrical Protection

The other vital purpose served by the power distribution line is electrical protection to the subsidiary electrical lines and miniature circuits in the house. The power distribution box is equipped with fuses and miniature circuit breakers (MCBs and MCCBs) that prevent permanent electrical damages to connected devices and wirings from risks like circuit overloads and power surges during electrical anomalies.

Commercial Sector

In commercial settings, such as offices, retail establishments, and restaurants, power distribution boxes are fundamental for reliable electricity distribution. They deliver power to lighting systems, HVAC equipment, office machinery, and other vital devices. These distribution boxes are integral in maintaining a dependable power supply for businesses while protecting against potential electrical faults and disruptions.

Industrial Sector

Manufacturing facilities, factories, and warehouses rely on power distribution boxes to effectively manage power distribution to heavy machinery, production lines, and various industrial equipment. This ensures the efficient operation of machinery and processes in environments characterised by high electrical loads. Power distribution boxes in the industrial sector are essential for efficiency and safety, facilitating reliable and secure electrical power distribution.

Healthcare Sector

Hospitals and healthcare facilities have critical power requirements to sustain the uninterrupted operation of essential medical equipment and patient care services. Power distribution boxes are strategically employed to disperse electricity throughout the facility, including crucial areas such as operating rooms, patient wards, and diagnostic laboratories.

Types of Distribution Box

Main Circuit Breaker Panel

The main and most common distribution panel. Electricity travels through the wires first to a meter that records usage and then to a circuit breaker panel. The circuit breaker panel plays the role of protecting and monitoring the circuit during use. In the case of circuit overheating and short circuit faults, the components in the circuit breaker panel can detect the fault and cut off the circuit to prevent subsequent greater damage.

Main Lug Panel

The main lug panel is basically located downstream of the main circuit breaker panel and is a sub-panel used to increase the number of circuits. In the main lug panel, the upstream input wires are connected directly to the lugs. In use, it can share the load of the main circuit breaker panel to meet the increasing power demand.

Sub Panel

The relatively small size of the sub-panel allows for more detailed power distribution to specific areas or rooms. From the internal components, there is the position of the circuit breaker. In this way, specific areas or rooms can be protected during use. For places with special power requirements, in order not to affect the power consumption of other areas, it is more convenient to install and use a sub-panel. Such as garages, office rooms, etc.

750VDC 250a 4p MCCB DC Molded Case Circuit Breaker

Fuse Box

The fuse box uses disposable fuses to protect the circuit from damage caused by overloads and short circuits. Inside a fuse is a thin, fusible strip of metal called the fuse element. When the current passing through it reaches a certain value, it will heat up and melt to cut off the circuit. Fuses have a much faster reaction time than circuit breakers and are suitable for protecting sensitive electronic equipment.

Adjustable Moulded Case Circuit Breaker MCCB

Transfer Switch

The transfer switch can switch the load between the two power supplies. It is an electrical switch. When the main power supply fails or fails, the main power supply can be switched to the backup power supply through the transfer switch. On the market, there are manual transfer switches and automatic transfer switches. In comparison, the manual transfer switch is cheaper and easier to install, while the automatic transfer switch can automatically switch the power supply in time. For places with demand, automatic transfer switches are essential, such as hospitals and so on.

How to Install Distribution Box?

Construction Process
Equipment Opening Check → Equipment Handling → Cabinet (Distribution Broad) Basic Installation → Cabinet (Distribution Broad) above Generatrix Wiring → Cabinet (Distribution Broad) Trision Wiring → Cabinet (Distribution Broad) Test Adjustment → Distribution Run Acceptance

Construction Technology
(1)Equipment out of the box inspection, installation units, supplies, or construction units at the same time, and finish check recording. The appearance of the cabinet (Distribution Broad) should not be damaged, electrical device and component, insulated porcelain parts, no damage, cracks, and other defects.

(2)Equipment transportation is collaborating with lifting work and electrical fitting. Depending on the weight of the equipment, and the distance can be used car, car hangs combined with transport, human strolled or hoist rolling transport.

(3)Based on the position of the construction drawing, the prefabricated basic steel frame is placed on the reserved iron and using the dumpy level or the horizontal ruler to make sure the steel at the horizontal level. In the end, the top of basic steel should be 10mm higher than the ground, and the High voltage switch cabinet is implemented by product technical requirements.

(4)After the basic steel is installed, the outdoor line flat steel is introduced into the indoor (mounted with the transformer mounting ground) and the two-end welding of the basic steel, the welding surface is twice the width of the flat steel, and then the base steel needs to be brushed two grey paints.

(5)The top busbar configuration on the top of the cabinet (distribution broad) requires verticality (per meter) <1.5mm, adjacent to the top of the two plates <2mm, the top of the same discharge plate <5mm, adjacent to the two plates <1mm, Cheng-listed discs <5mm, Capacular seams <2mm.

(6)According to the schematic, the cabinet (distribution broad) will have the second line connection, then check the entire appliance element on the cabinet (distribution broad), and its rated voltage and control operate the power supply voltage must be consistent.

(7)Cabinet (distribution broad) test adjustment: High-pressure test should be carried out by the test unit licensed which came from the local power supply department. Insulation shake test, with a 500V shake table to test the resistance of each loop at the terminal plate, and the resistance must be greater than 0.5mΩ. If the second small circuit loop is used in transistors, integrated circuits, and electronic components, the site’s inspection is not allowed to use the lanter and bell test, and the use of the multimeter test circuit is turned on or off.

(8)Power transmission operation acceptance, by the construction unit preparation test qualified adapter, insulated boots, insulated gloves temporary ground is woven copper wire, insulating pad, powder fire extinguisher. Thoroughly cleans all equipment.

Benefits of Using Distribution Box

Easy to Troubleshoot

When the circuits are enclosed in a distribution box they are labelled individually. It helps in recognizing these circuits with ease which makes it easier for technicians or engineers to work on them. It helps in reducing the overall troubleshooting time by locating circuits without much difficulty. Due to this, there is less risk involved in resolving problems related to circuits.

Centralized Control

With the help of a distribution box, it is easier to control several circuits from one place only. It is because the distribution box works like an electrical hub and helps in offering centralized control. It is easier to regulate the electrical system when all the circuits are placed in one place. It is quite beneficial for residential buildings, commercial complexes, and big industries where several circuits are used in an electrical system.

Scalable Solution

The need for power supply in industries or buildings can increase at any time due to several reasons. During such times, a distribution box is of great help. To fulfil these power needs, the distribution box can be upgraded without much difficulty. Distribution boxes are responsible for managing complicated electrical systems too.

Provides Safety

The distribution box comes with fuses and circuit breakers that offer great safety for electrical circuits. They help in offering protection during the time of short circuits or overloads. The circuit breaker is incorporated into the distribution box so that it can trip and stop the power flow to that particular circuit. It helps in preventing damage to the electrical system, appliances, home, and buildings.

Why is There Always Trip of Distribution Box?

Switch Damage
Switch what bad things can happen, trip is more common for no apparent reason. Can take trip switch load down the line, change other circuit connected to the load, and see if it is still tripping. If still tripping, it shows that switch is broken. Switch damage is the best solution, directly buy a switch to change line - take a picture of the old switch, best buy an identical new switch.

The Overload
Or "overheating". Any circuit breaker with overload protection function, if the current in a circuit is too large, will trigger the overload protection. So after the first trip, should first check the number of load in line, see if there are always too much electricity.

Why is also called "overheating"? Because of circuit breaker detect overload, rely on the heating effect of the "current" (test temperature), or current is larger, the greater the calorific value. But the current formula is Q fever - 12 rt, in addition to the current increase, increasing the resistance, also get hot. Receive, so if there is wire carefully, etc., can also trigger circuit breaker overload protection. So you also should check the wire connection (especially the switch terminal load side), see if there is a concubine.

● Features: do not regularly circuit breaker tripping, and the trip after reset button is not prominent, the screen does not change color (or no reset button or screen).

Short Circuit
An extreme form of overload, where the zero line and the fire line, or the fire line and the fire line are in direct contact, generating a very large current.
● Features: trip immediately after closing, tripping after reset button is not prominent, the screen does not change color (or no reset button or screen) Can cause a short circuit trip, there must be a clear short contact - visible to the naked eye. Can open each wire connector, check for a short sub. Especially the user use soft line, the burr must pay attention to the wire.

Under Voltage
If the breaker installed undervoltage tripping device accessories, it is possible to voltage instability in the circuit, automatic tripping. The purpose of undervoltage tripping device, is to prevent the voltage too high or too low, lead to electrical burn.

When the users have no way to repair, can consider to tear down a undervoltage trip - but since its trip, it shows that lines the voltage is there is a problem, suggestion. If the trouble, you can use the double trip, without artificial closing.
● Features: on the trip may have light, after the trip will flashing lights; May also have a reset button, trip after reset button will be highlighted.

The Leakage
Residual current circuit breaker will be in line with the leakage automatic trip, prevent users from electric shock. But not someone get an electric shock is leakage, break, somewhere, in contact with the conductor (the earth also calculate conductor), will be considered by circuit breaker is leakage.

After tripping should immediately check lines or appliances, find the leakage point - leakage troubleshooting is difficult, a lot of the time the leakage points are not visible to the naked eye, can use the professional tools (shaking table) auxiliary. After finding fault, repair electrical appliances or replace wire, big stuff.
● Features: may trip immediately after closing, can also be irregular trip. But after tripping reset button must be outstanding, or display color.

Factors to Consider When Choose Distribution Box

Utility

Distribution boxes hold some of the key facets of electrical supply. From the main switch, circuit breakers, bus bars and bypass equipment. It also holds safety devices to avoid short circuits, earth leakage and overload. Based on whether you are purchasing an electrical DB box for commercial or residential purposes, you can pick one that meets these needs. Irrespective of the use though, ensure your MCB distribution box is of good quality.

Types

Again, based on your unique needs, you can opt for a range of main distribution boxes. These include surface-mounted, flush-mounted, horizontal or vertical layouts. You can also procure different sizes of MCB DB which would include fewer or more circuits. It’s important to know the exact type of distribution box you need to ensure efficiency, optimal performance and safety.

Placement

Distribution boxes are big and clunky. This means that most people prefer placing them in concealed spaces. You can place your distribution box in your garage, basement or spaces under the stairs. While placing it in any of these areas, do ensure that the box receives sufficient ventilation to avoid overheating. You must make sure the box is easily accessible and can be easily switched off in case of any accidents.

Diffuse Type Photoelectric Sensor Switch

Aesthetic

Distribution boxes have always been at the receiving end of flak for their design. The boxes are usually bulky and look unappealing. With modern design and technology, these boxes have been redesigned to appear sleek, sharp and aesthetic. So even if you don’t have concealed spaces to store these boxes in, you can always keep it in plain sight. These well-designed distribution boxes when procured from a credible brand also ensure that its main function of distributing power remains uncompromised.

What You Should Know When Use Distribution Box

Visual Inspections:

Check for any signs of damage, wear, or overheating in electrical panels, switchgear, transformers, and other equipment.
Look for loose connections, frayed wires, or corroded components.
Ensure that proper labeling is in place for circuit breakers, fuses, and switches.

Electrical Panel:

Tighten electrical connections to prevent overheating and reduce the risk of electrical faults.
Clean dust and debris from panels and equipment to maintain proper ventilation.
Verify that panel doors are secure and properly sealed.

Circuit Breakers and Fuses:

Test and exercise circuit breakers to ensure proper operation.
Check for any tripped breakers or blown fuses and replace them as necessary.
Inspect and clean contacts to maintain good electrical conductivity.

Grounding and Bonding:

Inspect grounding systems and connections for corrosion or damage.
Measure ground resistance to ensure it falls within acceptable limits.
Verify proper bonding between electrical equipment and grounding systems.

Transformers:

Inspect transformer oil levels and condition (if applicable) and perform oil sampling as required.
Check for any signs of leakage, overheating, or abnormal noise.
Verify that cooling systems (fans, radiators) are clean and operational.

Electrical Cables and Wiring:

Inspect cables for any signs of wear, damage, or insulation deterioration.
Verify cable connections are tight and properly secured.
Check cable routing to ensure it complies with safety standards.

Electrical Safety Equipment:

Inspect and test safety equipment such as ground fault circuit interrupters (GFCIs), residual current devices (RCDs), and arc fault circuit interrupters (AFCIs).
Verify that safety labels and warning signs are in place and legible.

Products Description

Regular Visual Inspection

Performing regular visual inspections is the first step in distribution board maintenance. Check for any visible signs of damage, loose connections, or overheating. Look out for melted insulation, burned marks, or corrosion. If you notice any abnormalities, it’s crucial to address them promptly.

Tightening Connections

Over time, the connections within the distribution board can become loose due to vibrations or thermal expansion and contraction. Loose connections can lead to arcing, overheating, and electrical fires. Regularly tighten the terminal screws and busbar connections to ensure a secure and reliable electrical connection.

Cleaning and Dusting

Dust accumulation can hinder the proper functioning of the distribution board. Dust acts as an insulator, leading to heat buildup and reduced efficiency. Regularly clean the distribution board using a soft brush or a vacuum cleaner to remove any dust or debris. Ensure that the power supply is turned off before cleaning.

Verifying Circuit Breaker Operations

Circuit breakers are crucial components of a distribution board that protect against overcurrent and short circuits. Periodically test the circuit breakers to ensure they trip correctly and provide adequate protection. Follow the manufacturer’s guidelines for testing procedures and consult a professional if you encounter any issues.

Replacing Faulty Components

If you identify any faulty components during your maintenance inspection, it is important to replace them promptly. Faulty circuit breakers, damaged cables, or worn-out terminals can compromise the performance and safety of the distribution board. Always use genuine replacement parts and consult a qualified electrician if necessary.

Adequate Ventilation

Proper ventilation is essential to dissipate heat generated by the distribution board. Ensure that the distribution board is not obstructed by objects or covered with materials that restrict airflow. A well-ventilated distribution board operates more efficiently and reduces the risk of overheating.

Protection against Moisture

Moisture can corrode electrical connections and components, leading to poor performance and potential electrical hazards. Take measures to protect the distribution board from moisture, especially in areas prone to high humidity or water exposure. Use moisture-resistant materials, seal any gaps or openings, and consider installing a dehumidifier if necessary.

Regular Testing

Apart from visual inspections, regular testing of the distribution board is crucial to ensure its proper functioning. Test the voltage, current, and insulation resistance periodically using appropriate testing equipment. This helps identify any underlying issues and allows for timely maintenance or repairs.

Our Factory Photo

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Frequently Asked Questions of Distribution Box

Q: What is the function of distribution box?

A: A distribution box is a device that, as the name suggests, is designed to distribute electrical power. It takes the electrical power from the main power line and distributes it throughout the home or building with which it's used.

Q: What is the difference between electrical panel and distribution box?

A: When you say electrical service panel I'm assuming you are referring to the main panel (sometimes on the outside) with the MAIN disconnect breaker, say 150 or 200 amp. The distribution panel is the circuit breaker panel with all the circuits that may be inside, say in the garage.

Q: What is the advantage of distribution box?

A: They reduce tripping hazards. However, these tools can also protect against dangerous electrical problems in the field. For instance, distribution boxes protect circuit breakers. They accomplish this by ensuring your tools and equipment have a defense against potential overloads and short circuits.

Q: What is the difference between MCB and distribution box?

A: MCB (Miniature Circuit Breaker) is a distribution box that is fixed or provided in every apartments in modern societies. Instead of MCB box, a 32 Ampere DP switch was fixed that had an on-off switch. MCB box concept didn't exist as they were not aware of such a thing as MCB.

Q: What is the difference between meter box and distribution box?

A: The electricity meter installed in the electricity meter box belongs to the "metering box", which has anti-theft devices according to different requirements; "Distribution box" is the general term of "lighting distribution box" and "power distribution box" for power distribution!

Q: What is the difference between MCB and distribution board?

A: A Distribution board is a box that takes a main supply and distributes it to different consumers, usually by means of MCCBs connected to a supply rail, and looks like this; There is normally a cover plate that sits over the MCCBs to protect from the wiring and also is handy for putting the CB labels on.

Q: Where do you place a distribution board?

A: Distribution boards are big and clunky. This means that most people prefer placing them in concealed spaces. You can place your distribution box in your garage, basement or spaces under the stairs. While placing it in any of these areas, do ensure that the board receives sufficient ventilation to avoid overheating.

Q: What is the importance of distribution box in a domestic electric circuit?

A: Distribution box in domestic electrical circuit provides isolation between appliances and allow them to work paralelly. It also ensures failure in one part do not affect the functioning of the other.

Q: Why we use MCB and ELCB in distribution board?

A: MCB is the acronym for Miniature Circuit Break and MCCB stands for Molded Case Circuit Breaker. MCB is an electromagnetic appliance that is used in homes for protection against short circuits and electrical overload. In case of a short circuit, MCB turns offs automatically.

Q: What is HDB DB box?

A: Every residential HDB flat, condo, or landed property should have its own DB box. An electrical distribution board is a component that safely distributes electricity from a larger circuit into multiple smaller circuits.

Q: What are the two types of distribution boards?

A: Distribution boards are typically designed to split an incoming mains supply into various smaller circuits–these are usually designed to be one of two types and that is either single-phase or 3-phase distribution boards.

Q: What types of circuits can be wired into a distribution box?

A: Distribution boards can be designed as single-phase or 3-phase. They split the incoming mains supply into smaller circuits.

Q: What does it include?

A: The basic components of a distribution box include: Fuses, Circuit breakers, SPDs, Switches, Bypass devices, Insulating materials, Wires, Bus bars.

Q: How do you size a distribution panel?

A: Determine the entire load to the board.
Check the voltage of the service board.
Multiply the voltage by the square root of the number of phases.
Divide the load to the board as determined in Step 1 by the product in Step 3.

Q: How do I choose the right circuit breakers for my distribution box?

A: There are a few different criteria to consider when selecting a circuit breaker including voltage, frequency, interrupting capacity, continuous current rating, unusual operating conditions and product testing.

Q: How many circuits are in a standard electrical panel?

A: Electrical panels vary in the number of circuits spaces contained in each panel. A specialty panel, such as used in a barn or other outbuilding, may only contain 12 circuit spaces. Most 200 amp panels used in modern homes contain anywhere from 20 to 60 spaces. The typical home panel contains 40 circuit spaces.

Q: Can I install a distribution box myself, or do I need a licensed electrician?

A: This board transfers the electrical power from the central power plant to the homes and businesses in your area. It's important to have an electrician who knows how to install an electric distribution board correctly and efficiently.

Q: What safety precautions should I take when working with a distribution box?

A: Safety Tips to Maintain Power Distribution Board:
There should be a blanking plate cover on the unoccupied opening on a distribution board.
These boards should not be installed anywhere.
Do not place these boards around a fixed cooking appliance.
Distribution boards should be protected from corrosion.

Q: What is the difference between a fused and non-fused distribution box?

A: Fusible switches have a fuse provision in the switch and enclosure assembly, enabling you to open and close the circuit while providing overcurrent protection. Non-fusible switches do not have an integral fuse option and provide no circuit protection.

Q: How often should I have my distribution box inspected by a licensed electrician?

A: The frequency of electrical system inspections depends on the age of your home and the number of appliances you have. Most electricians recommend getting your electrical system inspected every 3–5 years. If your home is 25 years old or older, you should get it inspected more frequently, around every 2–3 years.

As one of the most professional distribution box manufacturers and suppliers in China, we're featured by quality products and competitive price. Please rest assured to buy buy customized distribution box made in China here from our factory. Contact us for quotation.

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