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What are the major types of Electrical panels and specifications according to the purpose like lighting/illumination, motor/pump etc ?

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Question added by Anandu V R PMP® , Senior MEP Coordination Engineer , CHC Building Contracting LLC
Date Posted: 2013/12/10
muhammad arif
by muhammad arif , Assistant Engineer , Phoenix armour

1.1.1.1 Table3 below lists required methods associated with assembly of control systems.

Table3. Required Documentation MethodsSubject StandardSchematic Format AutoCAD, ANSI Ladder

1.1.2 Regulatory DocumentsDocument Title Document Number, Issue DateElectrical Standard for Industrial Machinery NFPA79,2007

1.1.3 [Company] DocumentsDocument Title Document Number, Issue DateSystem Safety XXXXXX-XX,20112 SpecificationsFollowing are specifications for the fabrication of electrical controls and machine/system wiring.2.1 Control Panel Wiring2.1.1 Component Mounting2.1.1.1 Component locating shall be done per drawings using appropriate measuring, marking and squaring techniques with straight edges, squares and tape measures.2.1.1.2 Control components shall be attached to the enclosure backplane using tapped holes and appropriately sized machine screws. Exceptions may be made for components with specific manufacturer suggested mounting methods.2.1.1.3 Din rail shall be attached to the enclosure backplane using tapped holes and10-32 machine screws.2.1.1.4 “Self-tapping” screws shall not be used for component mounting.2.1.1.5 Plastic wireway may be attached to the enclosure backplane using tapped holes and appropriately sized machine screws, metal rivets or plastic rivets.2.1.1.6 Standard pushbutton holes shall be made using an appropriately sized punch and die set.2.1.1.7 Rectangular or square operator interface cutouts shall be closely sized to the component using manufacturer’s recommendations and deburred with no sharp edges.2.1.1.8 Metal shavings shall be removed after drilling, cutting or deburring operations prior to further mounting of components.2.1.1.9 Enclosures shall contain20% spare capacity.2.1.2 Component Wiring2.1.2.1 DC wiring shall be blue TFFN, THHN or MTW.2.1.2.2 AC120V wiring shall be red TFFN, THHN or MTW for hot or fused wires and white THHN, TFFN or MTW for neutral wiring.2.1.2.3 Ground wires shall be green TFFN, THHN or MTW. Ground wires shall be terminated by ground lug to the enclosure backplane and have a direct path to supplied power drop earth ground.2.1.2.4 Wire shall be sized for appropriate current carrying capability per NEC or NFPA79 sizing charts.2.1.2.5 Multiconductor wiring shall have their individual conductors terminated near each other.2.1.2.6 Conductors shall be stripped to a length such that the conductor is inserted entirely into the terminal block or termination point with no more than1/16” or1.5mm of exposed copper visible.2.1.2.7 Wiring shall be routed such that excess wire is not left in the wireway. Wiring shall also not be stretched tightly when rounding internal wireway corners.2.1.2.8 All conductors must have ferrules for termination wherever practical. Not required for wires larger than14AWG.2.1.2.9 Cables entering through a metal space must be protected by a fitting or gland.2.1.2.10 Wire nuts shall not be used inside of enclosures.2.1.2.11 Wire extensions should be avoided whenever possible. If a wire must be extended, the extension wire must be the same color and gauge as the extended wire. It must be soldered and covered in shrinkable tubing.2.1.2.12 Electrical tape shall not be used to cover wire or wiring splices.2.1.2.13 Wireway shall be no more than75% filled.2.1.3 Wire Labeling2.1.3.1 Wiring and cabling will be labeled using machine printed adhesive wrap around or heat shrinkable COTS labeling system.2.1.3.2 All wires and cables shall be labeled on both ends and match the designation on the schematic.2.1.3.3 Wire labels shall be clearly legible and oriented toward the front of the panel opening.2.1.3.4 Wire labels shall all be oriented in the same direction; read bottom-top or left-right.2.1.3.5 Wire labels shall be placed approximately1/8” or3mm from the terminal point and be consistent in appearance.2.2 Machine Wiring2.2.1.1 Wiring external to the control enclosure shall be contained in rigid conduit or EMT2.2.1.2 Minimum conductor size for motors shall be #14AWG.3 Drafting and Design4 Programming and Software

I apologize for the somewhat disorganized look of the text; WordPress (the application used to post this blog) doesn’t lend itself to formating text like a word document. Much of the content of this specification is fairly standard stuff. The NEC handbook and NFPA79 is a good reference for electrical assemblies built in the US. If anyone would like a copy of the original Word document and associated tables and formatting let me know.

Anyway the theme of this post is that it really is necessary to generate some kind of written specification for whatever your product is. Amazingly, most smaller companys have little or no specifications written for their electrical equipment.

Aftab Ahmed
by Aftab Ahmed , Senior Engineer- Technical Service and Coordination Department , Pakistan Oilfields Ltd (POL)

Mainly HT & LT Panels

 

then

 

Metering Panels

Circuit Breaker Panels

Control Panels

MCC Panels

Interlock / ByPass Panels

Marshalling Panel

Field JBs

Termination Panels

Fire Alarm Panels

HVAC Panels

Telecom Panels

Industrial UPS Panels

SCADA / DCS / PLC / Server / CPU / Modules Panels

 

 

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