What do you call a missing knock out on an electrical panel?
The part of an electrical panel where rectangle knock-outs are missing is usually called the “Dead Front” and for good reason. Terminology – rectangle filler pieces are often called knock-outs, panel cover twist outs or breaker filler plates.
When and how should you inspect powered hand tools?
When and how should you inspect powered hand tools? Inspect tools for any damage prior to each use. Check the handle and body casing of the tool for cracks or other damage. If the tool has auxiliary or double handles, check to see that they installed securely.
What happens if you snap in a bus plug?
When snapping in these metal plugs extra care should be taken, especially in an electrical panel or sub-panel. At times they will not snap directly in and pop out while snapping them in. If they hit a live bus bar or certain other parts of a panel, then arching may occur.
What happens if you hit a bus bar?
If they hit a live bus bar or certain other parts of a panel, then arching may occur. A second concern is that if they are in a hard to reach location or near live power that is not shielded, one could accidentally come in contact with the live power and get shocked.
When do you need a bushing for a conduit?
342.46/344.46 Bushings. Where a conduit enters a box, fitting, or other enclosure, a bushing shall be provided to protect the wire from abrasion unless the design of the box, fitting , or enclosure is such as to afford equivalent protection. Click to expand… Why is this not in 358 for EMT ?
What do you need to know about wire rope inspection?
Wire rope inspection should follow a systematic procedure: First, it is necessary that all parts of the sling are readily visible. The sling should be laid out so every part is accessible. Next, the sling should be sufficiently cleaned of dirt and grease so wires and fittings are easily seen.
What do you need to know about bushing requirements?
Where raceways containing ungrounded conductors 4 AWG or larger enter a cabinet, box enclosure, or raceway, the conductors shall be protected by a substantial fitting providing a smoothly rounded insulating surface, unless the conductors are separated from the fitting or raceway by substantial insulating material that is securely fastened in place.
What kind of inspections do wire slings need?
OSHA and ASME have different inspection requirements, frequencies, and removal criteria for each type of sling—including alloy chain slings, synthetic slings, metal mesh slings, and wire rope slings.
