Electrical
Systems
Introduction
Electrical systems for many types of boats are
complex. U. S. Federal regulations address critical areas
pertaining to electrical systems from the standpoint of safety
and stipulate requirements to assure good practice in these
areas. Some requirements may be specifically applied but many
requirements interact with others such as determination of
wire size and overcurrent protection. The large number of
requirements and the possible interpretations tend to be confusing
for those using the regulations.
Regulations are typically written in concise
terms, the words and arrangement chosen to be enforceable
and in some cases to be legally interpreted. This format prohibits
including
explanations, recommendations and easily detected alternate
solutions. A regulation provides an outline about which a
great deal of further information, interpretation, explanation,
clarification and helpful hints are needed in order to provide
good understanding and compliance with its intent.
This electrical system guideline attempts to
assist the average boat builder in achieving compliance with
these regulations. It explains, diagrams, makes some recommendations
and, in general, complements the regulations to improve the
boat builder’s understanding.
CAUTION
This guideline only
addresses provisions of the Federal Regulations. It
is not a complete engineering manual for the design
of electrical systems on boats. There are other manuals
and standards available for this purpose such as American
Boat & Yacht Council (ABYC) standards E-2, E-4,
E-8, E-9 and E-10. |
FORMAT
The format of this guideline has been chosen
to follow the sequence in the electrical system regulation.
This format provides a consistent sequence of information,
thereby reducing confusion for the boat builders and component
manufacturers who use it.
A portion of a regulation, titled FEDERAL LAW,
is stated and then a discussion follows. The discussion explains,
interprets, clarifies, identifies interdependence of requirements,
and is designed to improve the understanding of the intent
of the regulatory requirement. Diagrams are freely used, and
tables included wherever they can be helpful.
The discussion, diagrams and tables are followed
by compliance information identified by the title TO COMPLY
WITH THE LAW, that asks questions to which the answer must
be “yes” if compliance is to be achieved. This
is a checklist for each regulatory requirement. There are
further questions covering other factors and situations which
should be considered.
Typical electrical systems of installations
on various types of boats are annotated to show the applicable
section of the regulation. The systems shown are examples
and are not intended to be limiting in any way. Both simpler
and more complex systems may be installed on any of the depicted
boats. The appendix lists references and resources.
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