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DOE-HDBK-1092-98
5.1.6.7.3 ELECTRICAL TESTING INSTRUMENTS FOR USE WITH INITIATING
ELECTRICAL CIRCUITS
Instruments used with electrical initiating circuits connected to electroexplosive devices may be
further categorized for use with either low-energy initiators or high-energy initiators. All testing
instruments used for this purpose shall be current-limited. Before being used on initiating circuits,
every instrument wiring diagram and internal circuitry design shall be analyzed, examined, and
certified for the following:
1. The output current through a resistance equivalent to that of the minimum resistance initiator
of the class shall not exceed 1% and shall not exceed 10% of the no-fire rating for the most
sensitive initiator of the class. The current-limiting features of the testing instrument shall be
internal to the instrument and shall not depend on the circuit load characteristics.
2. The internal circuitry shall ensure isolation features that require, at a minimum, two
independent failure modes before the specified output current can be exceeded.
3. A comprehensive (point-to-point, if possible) wiring check shall be made to ensure that the
wiring corresponds to the diagram and that all components are functioning properly and
within specifications.
5.1.6.7.4 ELECTRICAL TESTING INSTRUMENTS FOR USE WITH NONINITIATING
ELECTRICAL CIRCUITS
Testing instruments in this category are used with electric circuits connected to instruments such as
strain gauges, pin switches, pressure transducers, thermocouples, and electrical components that are
affixed to or within an assembly with explosives. These instruments shall meet the following
requirements:
1. Each use of the testing instrument shall be analyzed to ensure that there is no credible scenario
where the normal test energy from the testing instrument can ignite explosive charges or
initiators in the test. This testing shall be consistent with Section 5.1.6.7.3.
2. Where a testing instrument is used to make measurements on sensors directly applied to
explosives (e.g., bonded strain gauges or pin switches), the testing instrument shall be
certified and controlled.
3. Testing instruments shall be prominently marked with restrictions on their use. Many of these
testing instruments do not meet the requirements for use with initiating systems and shall be
marked to prevent their use on this type of circuit.
5.2 PREVENTION OF EXTERNAL IGNITION AND EXPLOSION
Explosives are hazardous by themselves, but around electricity they become even more dangerous:
an arc, spark, or hot surface can easily touch off an explosion. Therefore, the electrical installation
shall contain these ignition sources or house them in an area well separated from the explosives
storage area.
5-12


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