1 scope
This technology is applicable to general
industry, civil construction engineering 1kV and below lighting, power, weak
flexible metal conduit and dark laying and the ceiling and wall panels in the
flexible metal conduit (plica tube) work.
2 construction preparation
2.1 materials requirements:
2.1.1 flexible metal conduit and its annex
shall comply with the relevant provisions of the existing national technical
standards and certification. Also should have the local fire department to
produce flame-resistant proof.
2.1.2 flexible metal conduit wiring project
with clamp, brackets, hangers, fittings and boxes, boxes and other accessories
shall be galvanized or coated with paint.
2.1.3 flexible metal conduit and related
accessories specifications shall conform to the national standard requirements
and design requirements.
2.1.4 other by needed material: wire pipe,
and wiring box, and lamp box, and socket box, and distribution box, and wiring
box connection device, and mixed tube joint, and lock tight nut, and fixed
clip, and grounding clip, and round, and flat steel, and angle, and bracket,
and hanging rod, and bolt, and nut, and washer, and spring washer, and
expansion bolt, and wood screws, and since attack screws, metal parts are
should plating zinc processing or for rust processing.
2.2 the main tools:
2.2.1 flexible metal wire and pipe cutters,
hydraulic opening, toothless saw, bench drill, hand drill, hammer, electric
welding machines, nail guns.
2.2.2 live moving hands, hacksaw, fish
pliers, hammer, chisel, cabinet file, drills, pliers, screwdrivers, electric
knives.
2.2.3 horizontal ruler, set square, ruler,
pencil, line, Gray Ash bucket, shovel, pink bags.
2.3 operating conditions:
2.3.1 pipe laying:
2.3.1.1 fit dark concrete structure when
laid, according to the design drawings, in front of the reinforcement as
finish, concrete water pipe stable boxes, buried under the reservation box, bin
location.
When pipeline construction brick-dark paid
2.3.1.2, wall standpipe, installation and location boxes, cartons, boxes, or
reserved.
2.3.1.3 serve light ceiling or wall surface
laying pipe, according to construction detail drawing, first line make sure
lights, sockets and other locations, with the ceiling and the wall piping,
steady the keel box, box.
2.3.1.4 the ceiling using a separate
support, hanging the concealed piping, piping in the ceiling joist installation
box.
2.3.2 out pipe laying:
2.3.2.1 should be installed during
structural embedded parts, reserved holes and caves.
2.3.2.2 using embedded method of fixation
and should be completed prior to plastering; when using expansion bolts fixing
bracket, should be carried out after the plastering.
2.3.2.3 plumbing steady spray of box should
be in civil decoration.
3 operational processes
3.3 piping installation requirements:
3.3.1 should according to the design
drawings to determine pipe direction, pipe laying. And should reduce bending,
reaching towards a reasonable, easy maintenance overhaul.
3.3.2 should be laid according to the
location, environmental conditions, the correct choice of flexible metal wire
and tube specifications and accessories.
3.4 dark pipe laying:
3.4.1 box, box location: according to the
axis of the construction drawings to determine cases, boxes, pop-up horizontal,
axis is civil as a benchmark, hang level, fall line alignment, standard out of
the box, the box of the actual location. Rows, the rows of boxes, boxes should
be telephoned or cross lines.
3.4.2 concealed in concrete structure in
the pipeline, the pipeline should be laid in the midst of two layers of steel.
Vertical line no vertical reinforcement laying on the same side, horizontal
pipe should be laid along with lateral transverse reinforcement.
3.4.3 when the brick-concrete structure
wall concealed, manage and shall promptly block the nozzle, and tube along with
the provisional pole installation direction lever.
3.4.4 prefabricated dark laying on the
floor, should be looking for lamp note box tubing. Immediately after laying the
pipeline with the strength of cement mortar not less than C10 stability
protection.
3.4.5 tick Groove installation should be in
slots on both sides of the first line, with cold chisel tick Groove width and
groove depth to 5mm larger than the pipe diameter is appropriate. Aerated
concrete wall should be electric blade slot. Tick tank installation, rejection
of Tenon-is strictly prohibited.
3.5 is concealed within the ceiling, pipes
can be laid in the main keel. Separate hanging pipe, its hanging point should
not exceed 1000mm. Boxes, boxes on either side of the fixed line, should not be
greater than 300mm.
3.6 wall panels (light gypsum board
partition) is concealed within, should be established for the keel at the same
time. Its fixed line, flexible metal wire tube matching clips can be fixed.
3.7 entering the box line, should be neat,
BG/UBG type junction box connector box lock, and installed BP insulation
protection. When entering the ground-mounted distribution boxes, screens,
flexible metal conduit, in addition to distribution box Foundation not less
than 50mm per cent higher, also makes pipe fixation.
3.8 fixed line:
3.8.1 installation in reinforced concrete
pipe, and reinforcement should be firm, lashing of the pipe spacing should not
be greater than 500mm, lashing from the box, the box should not be greater than
300mm. Binding thread thin wire can be used.
3.8.2 brick or masonry wall tick channel
laying pipe at intervals not greater than 1000mm distance, with a fine wire,
Iron nails.
3.8.3 ceiling and wall panels in the
pipeline, at intervals not greater than 1000mm distance, fixed by special
clips. In junction box, box joints, fixed point value should not be greater
than 300mm.
3.8.4 the prefab (round hole) on the pipe,
use plate fixed with nails, wire and mortar protection.
3.9 connection:
3.9.1 flexible metal pipe connected with a
flexible metal conduit and wires and steel pipe, thick metal pipes and wires,
various types of joins of boxes, shall be made in the special attachments. As
shown in table 3-12.
Types of flexible metal conduit fittings
and use table 3-12
Types and models
BG junction box connector flexible metal
conduit and junction box connections
UBG combination junction box connector
combination of flexible metal conduit and junction box connections
Hybrid connectors KG flexible metal wire
tube and steel wire and pipe connections
VKC Threadless connectors, flexible metal
wire tube and steel wire and tube combination
UKG mix Connector connection
Direct connector between KS flexible metal
conduit connect
Insulated sheathing BP to protect wire
insulation from damage, installed at the end of flexible metal conduit
Clip SP fix flexible metal conduit
Angle-AG flexible metal conduit junction
box connector connected with the junction box right angle combination
Waterproof junction box connector WBG outer
PVC plastic combination of flexible metal conduit and junction box connections
Waterproof hybrid connectors WCG covered
with flexible metal conduit PVC plastic and steel wire combination of sheathed
protecting pipe connection
WAG angle-waterproof junction box connector
flexible metal wire covered with PVC plastic tube connected to the junction box
right angle combinations, such as
Earth clamp DXA fixed ground wire
3.9.2 flexible metal conduit and boxes
except when using special accessories outer, should also be done: box hole
neat, Aperture coincides with the pipe diameter, tube hole must not be longer
holes, electrical welding holes in iron boxes is prohibited.
3.9.3 flexible metal conduit with flexible
metal pipe coupling with KS series connectors and wires. Due to the threaded
pipes, connectors, hand tighten screwed directly into the tube.
3.10 as VKV series threaded connector with
tube connections, must be using a wrench or pliers to tighten the connector
screws to prevent loose when pouring concrete.
3.11 pipe cutting methods:
3.11.1 flexible metal tubes and wires cut,
should be carried out using special cutters, and can be cut with an ordinary
hacksaw.
3.11.2 hold flexible metal conduit or
placed in the bench press with your hands, the blade perpendicular to the axial
alignment ripple pipe, side edges cut off tube.
Section 3.11.3: pipe cut off, can be
connected directly to the connector. But for convenience and accessory
connection can back out Burr, to smooth the section. C with a knife on the
inside rotating twisted around, make it easier to cross the line.
3.12 ground connection:
3.12.1 flexible metal pipes and tubes,
boxes and other connections and wires, must be used to connect flexible metal
wire tube matching grounding clip, the grounding jumper section of not less
than 4mm2 copper wire. Flexible metal conduit shall not be used for fusion
welding connect the ground wire.
3.12.2 flexible metal conduit, box, boxes
should join one reliable grounding.
3.12.3 flexible metal conduit shall not be
used as an electrical ground wire. AC 50V DC piping not bridging grounded 120V
and below.
3.13 when the flexible metal conduit
underground, and the bending radius should not be less than 6 times times the
outer diameter.
3.14 concealed in pipes in the buildings,
structures and buildings, minimum layer on the surface of the structure should
not be less than 15mm.
3.15 when concealed, flexible metal conduit
may be subject to heavy pressure or apparent mechanical impact, effective
protection measures should be taken.
3.16 flexible metal conduit through the
buildings and structures of settlement joint or joints, compensation measures
should be taken, wire should be enough.
3.17 when the flexible metal conduit when
you encounter one of the following, you should set the junction box or cable
box.
3.17.1 tube longer than 30m, no bending;
3.17.2 tube longer than 20m, there is a
corner;
3.17.3 tube longer than 15m, there are two
bending;
3.17.4 tube longer than 8M, there are three
corners.
3.17.5 is connected to a pipe of different
diameter.
3.18 vertical installation of flexible
metal conduit, in the following case, the crossing should set a fixed wire box.
3.18.1 tube conductor cross section for
50mm2 and below, each longer than 30m.
3.18.2 tube wire cross sections for
70mm2~95mm2, each longer than 20m.
3.18.3 tube wire cross sections for
120mm2~240mm2, each longer than 18m.
3.19 out pipe laying:
3.19.1 in accordance with design drawings,
combined with structural characteristics, decoration, pay attention to
ventilation, heating and plumbing, fire protection and other professional
premise to determine accurate installation location pipe direction, boxes, line
positioning.
3.19.2 prefabricated pipe brackets,
hangers, according to the number of pipes, pipe diameter drill pipe clamp
mounting holes. Boxes into the pipe hole, connector diameter well in advance,
so a one hole, arranged neatly. Junction box useless knockouts are not allowed
out, power distribution box (disc) not allowed to open the long holes and
welding holes.
3.19.3 first boxes with good stability with
expansion bolts. Then calculate and determine the bracket, hanger bracket, the
specific position hanger installation. Should be fixed spacing uniform, corner
of symmetry.
3.19.4 brackets, hangers and Terminal,
turning point or junction boxes, distribution boxes, electrical appliances
(dish) from the edge of 150~300mm. Pipe length does not exceed the 1000mm,
shall be fixed at least two places. The middle bracket, hanger maximum distance
should not exceed the limits set in table 3-13.
3.19.5 out timing, flexible metal wire and
tube bending, bend radius should not be less than 3 times times the pipe
diameter. Hold column, beam bending, use the dedicated adapter 30 ° bend
attachments.
Flexible metal conduit laid out table 3-13
distance between fixing points
Laying conditions for distance between
fixing points (mm)
Building or below horizontal laying
<1000
People may touch parts <1000
Flexible metal conduit connect, connected
with the junction box or fixed point junction <300
3.19.6 people flexible metal conduit and
wires in the ceiling should be laid according to specified requirements.
3.19.7 ceiling panels inside the junction
box if using flexible metal tubes and wires to lamps or devices, its length
should not exceed 1000mm, matching should be applied at both ends of the
connector locking, it tube skin protective earth conductor should be connected
with the junction box pipe joined with PE guard wire in the box.
3.19.8 horizontal or vertical laying out
fitted with flexible metal conduit that allows the deviation of 5 per thousand,
full length deviation should not be greater than diameter of 1/2. Laid should
be careful not to make flexible metal wire and broken pipe bending, it is hard
to meet the quality standards.
3.19.9 settlement joints and expansion
joints should be treated as compensation.
3.20 pipe Threading:
3.20.1 flexible metal wire and pipe
Threading practices and technology standards and other wiring tube Threading
practices are basically the same.
3.20.2 tube the total cross-sectional area
of conductors, including insulation should not be greater than the pipe
cross-sectional area within 40%.
3.20.3 equipment piping, thread prior to
the line of control when tubing, pipe the total cross-sectional area of
conductors, including insulation should not be greater than the pipe
cross-sectional area within 60%.
3.20.4 flexible metal wire diameter of Guan
Gong said numbered and plain tubes and wires, thick tieguangong that vary in
diameter. For ease of construction and swap, and as shown in table 3-14.
3.20.5 insulated wire allows the number of
pipe and the flexible metal conduit pipe
4 quality criteria
4.1 project:
4.1.1 material of flexible metal conduit,
model, specification and location must comply with the design requirements and
provisions of relevant national construction codes.
Inspection method: Visual check when laid,
concealed, concealed works of checking records.
4.1.2 for laying pipes, boxes, box must be
grounded and reliable, be integrated together. Selected specifications across
the grounding line, and materials in compliance with the relevant national
standard, pipe, grounding wire not welding connections.
Inspection method: Visual check and check
the hidden inspection, inspection records.
4.1.3 wire and wire to the insulation
resistance value must be greater than 0.5M.
Inspection method: practical testing and
inspection insulation resistance test record.
4.2 Basic project:
4.2.1 concealed pipes: pipes and tubes and
cartridges, boxes and other connections and mechanical connections should be
solid, reliable electrical connections, the thickness is greater than 15mm.
4.2.2 laid pipes: Ming piping should be
arranged regularly, firmly fixed, uniform distance between fixing points,
corner said, fixed spacing in accordance with specifications.
4.2.3 when piping through the settlement
joints and telescopic, with compensation measures, the wire enough.
Inspection method: observation of
inspection, measuring with a ruler and check the hidden inspection records.
4.3 allowable deviation (3-16):
5 finished product protection
5.1 when concealed in a bar, should be
protected better steel banding, not allowed to damage steel or any cutting
steel.
5.2 mark Groove, tick do not push too hard,
don't pick too broadly, excessive influence quality of civil engineering
structures. Breaking structural reinforcement must be consent of the civil
construction technical director before hamstring and civil measures.
5.3 when pouring concrete, must be
electrical care to prevent phenomena such as pipeline connection from, found
that the problem should be repaired in a timely manner.
5.4 laid pipe, should pay attention to the
protection of civil decorations and clean, no pollution finishes such as walls.
5.5 after the tube should be promptly
blocked well pipe. As construction progress and so Kwun Wat to wear line,
blocking good boxes, cartons.
After 5.6 thread protection measures should
be timely, in order to avoid paint pulp pollution boxes, boxes and wires.
Install the lights, switch Sockets and other machinery, pay attention to civil
decoration surface cleaning.
5.7 laid pipeline laying has been
completed, such as casting and finishing works live civil repair should take
timely measures on pipe, box, box protected to prevent contamination, resulting
in clear difficulties in the future.
6 quality problems to be noticed
6.1 side installation switch, outlet boxes
are not on the same level, beyond the allowable deviation should be telephoned
line steady load, or take a short tube and stable box.
6.2 in-situ concrete and pipes in the
ceiling fixed points within distance does not meet specifications, increase the
fixed point.
6.3 next when piping, because location no
and flexible characteristics of flexible metal conduit itself, resulting in
uneven arrangement, horizontal and vertical degrees exceeding the allowed
deviation. Perceptions of poor quality.
6.4 the pipeline across the grounding line
with boxes, cartons, cards not in prison, clamp, wire of choice does not meet
quality standards.
6.5 when threading pipe clogging occurs,
mainly because it is not according to process requirements and so Kwun Wat to
wear line, it tube is not blocked in a timely manner well, other types of tick
cut cause the pipeline to be destroyed.
6.6 use of flexible metal conduit fittings
of poor quality or specifications not matching, caused the pipeline joins poor
mechanical strength and boxes, box joints loose and not in prison.
7 quality records
7.1 tubing manufactured materials,
certificate of competency.
7.2 pipe accessories product certification.
7.3 the flame-resistant proof issued by the
Fire Services Department (that year).
7.4 equipment, accessories, materials
entering inspection records.
7.5 pre inspection projects and inspection
record form.
7.6 cover engineering and inspection record
form.
7.7 pipes and tubes threaded section for
quality inspection and assessment records.
7.8 electrical insulation resistance test
record.
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