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ANSI/NEMA PB 1.1-2023 General Instructions for Proper Installation, Operation and Maintenance of Panelboards Rated 1000V or Less, 2023
- Section 1 Scope
- Section 2 References
- Section 3 General [Go to Page]
- 3.1 Successful Operation of Panelboards
- 3.2 Qualified Personnel
- 3.3 Definition of Qualified Personnel [Go to Page]
- 3.3.1 Requirements
- 3.3.2 Established Safety Practices
- 3.3.3 Protective Equipment
- 3.3.4 First Aid
- 3.4 Suitable Ratings
- Section 4 Installation of Panelboard Cabinets (Boxes) [Go to Page]
- 4.1 Installation Instructions
- 4.2 Location in Building
- 4.3 Flammable Material
- 4.4 Unusual Service Conditions
- 4.5 Indoor Damp Locations
- 4.6 Wet Locations
- 4.7 Clearance from Ceiling
- 4.8 Space Around the Cabinet
- 4.9 Mounting of Cabinet
- 4.10 Flush Mounting in Wall
- 4.11 Unused Openings in Cabinet
- 4.12 Grounding of Panelboard Cabinets
- Section 5 Installation of Conduit and Conductors [Go to Page]
- 5.1 Conduits Installation
- 5.2 Knockouts Removal [Go to Page]
- 5.2.1 First Step—Remove Center Knockout [Go to Page]
- 5.2.1.1 Screwdriver Blade
- 5.2.2 Next Step—Remove Rings [Go to Page]
- 5.2.2.1 Pry First Ring
- 5.2.2.2 Second Ring
- 5.3 National Electrical Code, Article 300
- 5.4 Conductor Length
- 5.5 Exercise Care
- 5.6 National Electrical Code, Section 725.136
- Section 6 Installation of Panelboard [Go to Page]
- 6.1 Proper Storage
- 6.2 Unpacking
- 6.3 Inspection
- 6.4 Care [Go to Page]
- 6.4.1 Cleaning
- 6.5 Manufacturer’s Instructions
- 6.6 Installation [Go to Page]
- 6.6.1 Alignment Devices
- 6.6.2 Panelboard
- 6.6.3 Flange of Deadfront Shield
- 6.7 Line and Branch Conductors [Go to Page]
- 6.7.1 Conductors [Go to Page]
- 6.7.1.1 Wiring Gutters
- 6.7.1.2 Types and Temperature Ratings
- 6.7.1.3 Tighten All Terminals
- 6.8 Panelboard Grounding and Bonding [Go to Page]
- 6.8.1 Equipment Grounding Conductors
- 6.9 Proper Type or Class and Rating
- 6.10 Debris
- 6.11 Steps in Section 7
- Section 7 Steps to Be Taken Before Energizing [Go to Page]
- 7.1 Accessible Electrical Connections
- 7.2 Blocks and Packing Materials
- 7.3 Switches, Circuit Breakers, and Other Operating Mechanisms
- 7.4 Short Circuits and Ground Faults
- 7.5 Ground-Fault Protection System
- 7.6 Adjustable Time Current Trip Device Settings
- 7.7 Grounding Connections
- 7.8 Foreign Material
- Section 8 Installation of Cabinet Front [Go to Page]
- 8.1 Cabinet Front or Trim Package
- 8.2 Unpacking
- 8.3 Covers and Doors
- 8.4 Touch-Up
- 8.5 Front Alignment
- Section 9 Energizing Equipment [Go to Page]
- 9.1 Qualified Personnel
- 9.2 Load on the Panelboard
- 9.3 Energized in Sequence
- 9.4 Loads Such as Lighting Circuits, Contactors, Heaters, and Motors
- Section 10 Maintenance [Go to Page]
- 10.1 Maintenance Program
- 10.2 Panelboard That Has Been Carrying Its Regular Load for at Least 3 Hours
- 10.3 Inspect Panelboard Once Each Year
- 10.4 Accumulation of Dust and Dirt [Go to Page]
- 10.4.1 Visible Electrical Joints and Terminals
- 10.4.2 Conductors and Connections
- 10.4.3 Fuse Clip Contact Pressure and Contact Means
- 10.4.4 Plug Fuses
- 10.4.5 Conditions That Caused Overheating
- 10.5 Proper Ampere, Voltage, and Interrupting Ratings [Go to Page]
- 10.5.1 Mechanisms Free and in Proper Working Order
- 10.6 Operation of All Mechanical Components [Go to Page]
- 10.6.1 Switch Operating Mechanisms
- 10.6.2 Integrity of Electrical and Mechanical Interlocks
- 10.6.3 Missing or Broken Parts
- 10.6.4 Manufacturer’s Instructions [Go to Page]
- 10.6.4.1 Clean Nonmetallic Light Grease or Oil
- 10.6.4.2 Molded Case Circuit Breakers
- 10.6.4.3 Clean, Light Grease
- 10.6.4.4 Excess Lubrication
- 10.6.5 Accessible Copper Electrical Contacts, Blades, and Jaws
- 10.7 Damaged Insulating Material and Assemblies
- 10.8 Moisture or Signs of Previous Wetness or Dripping [Go to Page]
- 10.8.1 Conduits That Have Dripped Condensate
- 10.8.2 Cracks or Openings
- 10.8.3 Insulating Material That Is Damp or Wet
- 10.8.4 Component Devices That Show Evidence of Moisture Damage
- 10.9 Before Cleanup and Corrective Action Is Attempted
- 10.10 Electrical Short Circuit
- 10.11 Ground-Fault Protection System
- 10.12 Insulation Resistance [Go to Page]
- 10.12.1 Short Circuit
- 10.12.2 Parts Replaced
- 10.12.3 Panelboard Exposed to High Humidity
- Section 11 Permissible Loading of Panelboards [Go to Page]
- 11.1 National Electrical Code
- 11.2 Harmonics in Electrical System [Go to Page]
