ANSI Device Numbers. From Wikipedia, the free encyclopedia. The ANSI Standard Device Numbers[1] [2] [3] denote what features a protective device supports (such as a. relay or circuit breaker). These types of devices protect electrical systems and components from damage when. an unwanted event occurs, such as an electrical fault.
The piston ring speed on the average chainsaw travels 2,500 surface feet per minute. A chain slides across the surface of the sawbar rail at around 5000 feet per minute. The chain is moving at 55 to 60 m.p.h. or a mile per minute (88 feet per second).
Although the same points from the electric chainsaw list are true for cordless (battery) chainsaws, there are a few additional cons of cordless operated chainsaws. 1  Limited time usage as battery may only last 20 to 60 minutes, depending on specific model and workload. 2  Less power than gas or corded chainsaw. 3  Expensive.