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NEW AND EXISTING INSTALLATIONS 
by the Safety Code for Mechanical Power-Transmission Apparatus 
(American standard), obtainable from the American Engineering 
Standards Committee, of 29 West Thirty-ninth Street, New York 
City, or in accordance with the State laws of the particular operating 
States. LI 
(¢) Switches and other electrical apparatus—All switches and 
other electrical apparatus shall be of a type or guarded as required 
by the National Electrical Safety Code (American standard), issued 
by the United States Bureau of Standards, Washington, D. C., or 
'n accordance with the State laws of the particular operating States. 
GENERAL 
Rule 103. Mill-roll height. 
All mills should be installed so that the top of the front roll is not 
less than forty-six (46) inches above the working floor level or 
platform on which the operator stands. irrespective of the size of 
the mill 
SAFETY-TRIP CONTROLS AND QUICK-STOP FACILITIES 
Rule 110. Safety-trip control—Mills. 
(a) A safety-trip rod or tight-wire cable for each individual mill 
shall be provided front and back of all mills, extending the length 
of the face of the rolls. It shall overate sensitively if it is pushed 
or if it is pulled. 
(0) The normal location of the safety-trip rod over the front roll 
shall be two (2) inches to four (4) inches in from the edge of the 
front roll and not more than sixty-nine (69) inches above the work- 
ing floor level on which the operator stands, with provision made 
for adjustment of three (3) inches either up or down. (See illustra. 
tion No. 1.) 
(¢) The normal location of the safety-trip rod at the back of the 
mill shall be two (2) inches to four (4) inches in from the edge of 
the back roll and shall be in the same horizontal plane as the safety- 
trip bar over the front roll, and the length of the lever from fulcrum 
shall be the same. 
Rule 111. 
The fixed center rod or tie running the length of the roll, some- 
times used for construction purposes. shall be omitted. 
Rule 112. 
The locations of safety trips apply to all sizes of mills. 
Rule 113. Dry grinding. 
(2) In dry grinding and in mixing processes, where the material 
is shoveled nto a trough over the bite of the rolls, the foregoing 
rules 110 to 112, inclusive, will not apply, provided the throat of 
the trough over the bite of the rolls is screened with heavy three (3) 
inch by three (3) inch mesh of not less than No. 8 gauge wire and 
the trough and the screen are made a permanent fixed part of the 
machines and are so designed with regard to openings therein that 
it is impossible for an operator’s hand, intentionally or otherwise, 
to come in contact with the bite of the rolls. 
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