The Junction Box or junction box is used in building construction.
The box includes a square box that provides protection and
security barriers for electrical wiring connections or power
cables. The most common use of Junction Boxes that most
electricians are familiar with is in electrical installations, or
in simple terms, in construction or industrial electrical wiring.
In residential and commercial buildings, factories and industries,
due to the existence of electricity distribution network, the
Junction Box can be used. Due to the high use of Junction Boxes in
many places, the material of the Junction Box can be made of
metal. Or non-metallic.
The purpose of using the Junction Box is to create a safe
environment for conductors or wires and power cables that need to
be replaced along the way during construction. The Junction Box
basically has a lid. The cap allows the Junction Box to protect
wires or power cables. This cap protects the Junction Box from
environmental access. The Junction Box cover can prevent dust and
moisture from entering it.
A small metal or plastic Junction Box can be part of an electric
conduit or wiring system for thermoplastic cable (TPS) in a
building. Be. Especially in residential or commercial buildings, a
suitable type can be hidden in wall plaster (although completely
hidden, many are not allowed in terms of modern codes and
standards) or placed in concrete. So that only its cover is
Definition of Junction Box
The Junction Box or junction box is used in building
construction. This split box includes a square box that
provides protection and security barriers for electrical
wiring connections or power cables. The most common use
of Junction Boxes, which most electricians are familiar
with, is in electrical installations, or simply in
construction or industrial electrical wiring. A split
box is used to distribute conductors and cross-section
and protect electrical wires or cables. In residential
and commercial buildings and factories and industries,
electricity distribution boxes can be used due to the
existence of electricity distribution network. Due to
the high use of Junction Boxes in many places, the
material of the Junction Box can be metal or non-metal,
depending on the environment used.
Junction Box distribution material:
■ Metal Junction Box.
■ Non-metallic or plastic Junction Box.
What is the reason for naming the Junction Box and the
reason for using the Junction Box code?
Junction Boxes have special codes. Using those codes
lets us know where and how to use the Junction Box.
Based on these codes, the Junction Box can resize and
meet our diverse needs. The Junction Box can simply be
used to protect the connection of multi-purpose wires
and cover a flat plate. Junction Boxes, such as a door,
are used for outputs or wall switches. Other boxes are
used to hang ceiling fixtures and more.
The reason for naming it in the Junction Box (or
junction box) goes back to its original use. Initially,
the electrical partition box was used in the building's
electrical wiring to hide connections and make
connections. Today, although the use of Junction Boxes
has changed a lot, it is still known by its original
name, the same Junction Box. In every electrical and
industrial system, there are electrical connections
between different parts. These connections may be
through the terminal or directly overhead. Various
environmental conditions such as dust, high temperature
and extreme humidity affect these connections. These
connections must be housed inside a closed compartment
to increase safety and prevent connection. Using a
Junction Box is a good solution.
Types of boxes Electricity distribution in terms of body
■ Aluminum Junction Box (Dicast).
■ Galvanized Junction Box.
■ Plastic Junction Box. (ABS).
■ Polycarbonate Power Junction Box
■ Anti-explosion Junction Box.
Aluminum Power Junction Box (Dicast):
Aluminum Junction Box is made of aluminum alloy and is
very strong and suitable for mechanical engineering and
industrial automation applications. This Junction Box
has special thermal and mechanical properties depending
on the material of the body. This feature makes it
efficient for use in industries, ports, shipbuilding,
agriculture, and in general applications with difficult
conditions and loads. The aluminum Junction Box prevents
its internal equipment from being subject to a variety
of pressures and stresses and is resistant to cold, heat
and damage to roads, railways and tunnels. The
electrical partition box usually has an IP66 protection
class and its aluminum mold is covered by an
anti-scratch electrostatic paint coating. In general,
the Aluminum Junction Box is suitable for use in open,
humid and high-pressure spaces.
Galvanized Power Junction Box:
The galvanized power partition box is a good place for
electrical connections that protect the connections
against the dangers of high temperatures as well as
corrosion. This type of electrical distribution box
protects corrosion due to the galvanized body. In this
type of box, the main metal partition is covered by a
layer of protective metal, which is usually made of
zinc. This type of box is made of "electric partition"
in two forms: hot galvanized and cold galvanized. In
general, this type of box is divided into electrical
parts due to its ability to protect against corrosion in
open environmental conditions where there is a risk of
corrosion and rust.
Plastic Power Junction Box (ABS):
Plastic Junction Box is one of the most widely used boxes
in the electrical industry. Its unique features compared
to the box - the distribution of electricity with other
body materials has increased the use of this box - the
distribution of electricity in different environments and
The most important features of this box are "electrical
partitions", mechanical strength and impact resistance,
as well as high chemical resistance and electrical and
thermal insulation. The strength of this box, the
distribution of electricity in the sun, and its
usability in environments with high humidity and dust,
the use of this box has increased the distribution of
electricity. In general, the reasonable price of this
box, the distribution of electricity, as well as the
strength and high degree of protection are the most
important features of this type of box.
Polycarbonate Junction Box:
Polycarbonate is one of the hardest transparent and
opaque plastics. Polycarbonate is a good alternative to
glass and plastic in the industrial, construction and
laboratory sectors. The polycarbonate Junction Box,
along with the metal assembly plate, has transparent
impact-resistant doors, deformation, color change, fire
and electrical hazards. These Junction Boxes can be used
outdoors and in humid environments. This box is usually
used to distribute electricity as a switchboard to
assemble power or command electrical circuits.
Explosion-proof Power Junction Box:
Briefly about explosion-proof junction box
Electric blasting box or so-called explosion-proof box
or so-called explosion-proof housing has various
electrical components such as switches, sockets,
transformers and controls and handles to protect the
environment from electrical hazards. This anti-spark
chamber is resistant to sparks, explosions and electric
shocks by using up-to-date technology. It also has the
ability to withstand extreme temperatures.
Using this power splitter box is an ideal solution to
prevent Excessive damage to hazardous environments is
prone to explosion. Anti-explosive protection
compartment is provided depending on the place of use
and their level of protection. Here we describe the
technical specifications of the explosion-proof Junction
Box. These boxes are designed and manufactured in
The length of the junction boxes is from 250 mm to 720
The width of the junction boxes is from 200 mm to 560
The depth of the junction boxes is from 170 mm to 345
mm. In addition, the explosion-proof junction box can be
made of aluminum, stainless steel and GRP.
Types of explosion-proof boxes:
■ Aluminum explosion-proof Junction Box.
■ Stainless steel explosion-proof Junction Box.
■ GRP anti-explosion junction box.
Aluminum explosion-proof Junction Box:
Aluminum metal blasting, blasting, waterproof and
dustproof electrical distribution box suitable for
installation of electrical equipment This type of
aluminum anti-explosive metal Junction Box has the best
type of protection against explosion-proof Junction Box
with door washer, hinge and door handle, explosion-proof
box in different dimensions and shapes and thickness
with rail and terminal and with capability. Installation
of explosion-proof signal lights Multi-mode knobs, stop
and start explosion-proof, ammeter,… on the lid of the
explosion-proof Junction Box. Punch and spread of all
kinds of anti-explosive gold around the body of the
Junction Box to the permitted and standard level of the
company that produces this product. Other advantages of
this type of explosion-proof and waterproof aluminum
junction box, which can be mentioned, are the ability to
install rails, terminals, breakers, contactors, fuses,
and so on. Also in the body of this Junction Box,
stainless steel bolts and nuts have been used.
Stainless steel explosion-proof Junction Box:
Steel blasting Junction Box is made of stainless steel
and is suitable for electrical installations. In
aggressive and humid environments and environments that
have corrosive substances, due to the anti-corrosion
properties of steel, this type of junction box can be
used. Accessories for this power-sharing box include
stainless steel bolts, EPDM washers at the door
junction, and internal and external screws. This
Junction Box can also be used in various cases as a
terminal box, junction box. Depending on the type of
application, different types of drilling can be done on
it. The importance of choosing the right distribution
box for the relevant environment is so important that if
you do not pay enough attention, there is a possibility
of any irreparable risks. This type of stainless steel
explosion-proof Junction Box has a washer around the
door and can be used as an anti-corrosion box and is
usually used as a box terminal.
GRP anti-explosion junction box:
The GRP explosion-proof Junction Box is made of
fiber-reinforced polyester. GRP explosion-proof Junction
Boxes can be installed in all industrial plants due to
their resistance to fuel oil pollution and mechanical
shocks, as well as their lightness and practicality,
especially in cases where there is a potential risk of
explosion or fire. has it. The split box door has a
silicone gasket that is resistant to low and high
temperatures and corrosion. This type of Junction Box is
made with various thicknesses, sizes and shapes.
GRP explosion-proof Junction Box with round door washer,
corrosion resistant, commonly used as a terminal box.
This type of Iranian explosion-proof box is resistant to
high temperatures. The material of the Iranian GRP
anti-explosion Junction Box is made of polyester fibers.
This type of Junction Box is made with various
thicknesses, sizes and shapes....
What to consider when choosing a box for electrical
■ Body and box material Electrical partition.
■ Dimensions of the box Electrical partition.
■ Degree of protection Electricity division.
■ Installation method Electrical partitioning.
Here are some tips to help you get started:
Sometimes the Junction Box includes built-in terminals
for connecting wires, and if a terminal is not built
into the Junction Box, a rail terminal can be installed
by installing a miniature rail. Installing these
terminals provides the following benefits.
۱ - It prevents the wires and fittings from being
cluttered, which greatly increases the security level of
۲ - The presence of a rail terminal makes it easy to
connect two or more wires or branch from one wire.
۳- Rail terminals can be fitted with numbers or labels,
and you can stick a simple map of the connections inside
the Junction Box on the door, or put the map inside the
Junction Box so that you can easily make a problem or
change the system. Control the system.
۴- The Junction Box has the ability to install gold and
the wires can be passed through the gold. He then
inserted them into a junction box or Junction Box. This
prevents the power from being transmitted to terminals
or junctions if the cables are pressurized by a foreign
۵- If necessary and according to the environmental
conditions, it is possible to provide boxes with high
IP, such as IP = 65, which usually have a plastic washer
on their door. If Gland is used at the entrances and
exits of wires and cables, it is not possible for dust,
water and moisture to enter the terminal box after
closing the lid of the Junction Box. This further
protects the connections inside the Junction Box.