NFPA 70B Suggestions for Inclusion in a Walk-Through Inspection Checklist


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Aug 3, 2018
Boston, Massachusetts
NFPA 70B Suggestions for Inclusion in a Walk-Through Inspection Checklist, Courtesy WWW.NFPA.ORG

General. These suggested items are directed toward minimizing day-to-day electrical hazards. This list is not complete, nor do the items necessarily appear in order of importance. It is presented as a guide for the preparation of a checklist that should be developed for each building. Because of the similarity to the building fire prevention inspection, both inspections can be carried out by the same personnel.

Flexible Cords (Including Those on Appliances). Heater- type cords are recommended for portable heating appliances, such as toasters, grills, and coffee makers. An inspection should be made for badly worn or frayed spots, splices (not permitted), improper type, or current-carrying capacity that is too small.

Plugs and Connectors. A check should be made for stray strands and loose terminals. They should be dead front grounding types where required for specific appliances. The green conductor should be connected to the grounding terminal.

Extension Cords. Are extension cords used in place of permanent wiring, and are they of excessive length and of proper type? They must not pass through walls, partitions, or doors.

Multiple Current Taps. Are multiple current taps used because of too few receptacles? In particular, are they used in areas such as canteens, lunchrooms, and offices?

Appliances. Grills, toasters, and similar equipment must be permanently spaced from combustible material.

Heating Appliances. Where used with combustible material, such appliances generally require a signal light to indicate when they are “on.”

Water Heaters. A check should be made for proper electrical protection. The combination temperature and pressure relief valve should be manually operated to be sure it is free and the drain line is clear. The setting should be visually checked.

Office Equipment. The condition of flexible cords, plugs, and connectors should be checked, and excessive use of extension cords and multiple current taps should be noted.

Receptacle Outlets. Grounding-type receptacles are generally required. Each receptacle should be checked for continuity of grounding connection, using a suitable test instrument. Are special receptacle configurations used for those supplying unusual voltages, frequencies, and so on? Are they well marked or identified? In particular, missing faceplates, receptacles showing signs of severe arcing, loose mounted.

Yard Transformer Stations. The condition of transformers, fence, gates, and locks should be noted. Yard and equipment should be free of storage of combustible material, weeds, grass, vines, birds' nests, and so on. Localized overheating, indicated by conductor discoloration, should be watched for. Indication of excessive transformer temperature, pressure, or oil leakage should be noted.

Services. The condition of weatherheads and weather‐ hoods should be visually checked to determine that they remain in good condition. Birds' nests, rats' nests, and so on, should be eliminated. At the same time, the apparent condition of lightning arresters, surge capacitors, grounding conductors, and grounds should be determined. Are switches safely and readily accessible?

Switch Rooms and Motor Control Centers. Switch rooms and motor control centers should be clean, used for no other purpose, and free of storage of any kind, especially combustible material. Ventilation equipment should be in working condition and unobstructed. Any unusual noises or odors should be noticed and reported promptly. Metering equipment should be checked for high or low voltage and current and any indication of accidental grounding (ungrounded systems). Are switches and motor controllers properly identified as to function; are fire extinguishers in place, of suitable type, and charged?

Grouped Electrical Control Equipment (Such as Might Be Mounted on Walls). Is grouped electrical control equipment protected from physical damage and readily accessible? Are any equipment enclosures damaged, or do any have missing or open covers? Are any live parts exposed?

Portable Equipment (Tools, Extension Lamps, and Extension Cords). In the shop or tool room, a check should be made after each use for isolation between live parts and frame. The condition of cords and plugs should be noted. Is continuity maintained between the frame and the grounding pin of the plug? The green conductor should connect only to the plug grounding pin. On lamps, the condition of guards, shields, and so on, should be checked. See NFPA 70 for portable hand lamps; metal-shell and paper-lined lampholders for hand lamps are not permitted.

Lighting Fixtures. All lighting fixtures should be labeled and grounded. See NFPA 70 for connection of electric- discharge lighting fixtures. These are permitted to be connected by suitable, three-conductor flexible cord where visible for its entire length and terminated at outer end in a grounding- type attachment plug or busway plug. No fixtures should be located close to highly combustible material. The location of fixtures with burned out bulbs or tubes; fixtures that are heavily coated with dust, dirt, or other material; and reflectors that are in need of cleaning should be noted.

Equipment Grounding. Where machinery or wiring enclosures are grounded through the conduit system, broken or loose connections at boxes and fittings, flexible connections, and exposed ground straps should be identified. Multiple bonding of conduit and other metallic enclosures to interior water piping systems, including sprinkler systems, is sometimes used as a precaution where building vibration is severe.

All exit lights should be functioning properly.

Emergency lights should all be in working condition. Periodic tests are recommended to ensure that emergency lights function when normal lighting is lost.

Emergency power supplies, such as batteries and engine-driven generators, normally receive scheduled tests. Records of periodic tests should be checked. Are fuel and cooling supplies for engine drives adequate? Are fire extinguishers in place of proper type, and charged?

Alarm systems, such as for fire, intrusion, smoke detection, sprinkler water flow, and fire pumps, also receive periodic tests. Records of these tests should be checked to ensure that all signals are properly transmitted and that equipment is in good condition.working condition.
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