The _m_ss__n _f _etters can _ead to greater pr_b_ems and c_nfus__n. _ be__eve
these are ru_es made by bureaucrats wh_ __ke t_ make ru_es and enj_y f_nd_ng
ways t_ p___ce _thers.
B_b J_hns_n
Robert A. Macy wrote:
Did not see any answers to this question. Were there any?
Is there a list? Too "off topic"?
- Robert -
On Thu, 6 Oct 2005 09:03:29 -0700
"POWELL, DOUG" <mailto:doug.pow...@aei.com> <doug.pow...@aei.com> wrote:
All,
The subject has come up about allowable or excluded
revision letters for
equipment or documents using the English alphabet. I
understand this is
not strictly an EMC or Safety question but I think it
does fall under
some form of compliance.
I am interested to learn if any companies have standard
practices for
allowable revision letters or a simple exclusion list of
letters that
may not be used. I have had this discussion with others
before and it
seems that each of us had slightly different experiences.
One company
says I, O, Q, X are excluded from use to avoid confusion
with hand
written numbers and symbols. Mil Std 490 says: I, O, Z,
which can be
confused with numerals, shall not be used. on occasion,
I have seen the
letter "L" excluded mainly because of the old manual
typewriters using
low case "L" for numeral "1"
Also, should revision letters always be upper case?
The subject of double-letter revisions after using the
last
single-letter revision has been confused by some and I
have occasionally
seen a sequence like the following:
AA, BB, CC, DD, etc.
Obviously this is not as efficient as:
AA, AB, AC AD, ..., BA, BB, BC, BD, ..., CA,
CB, CC, CD,
..., etc.
Any comments or experiences are welcome.
-Doug
Doug Powell, Staff Engineer
Corporate Compliance Dept.
Advanced Energy Industries Inc.
Fort Collins, Co. USA
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