This translation is provisional translation for reference, formally refer to the original text.

Ordinance No. 24 of 2013 of the Ministry of Internal Affairs and Communications
Ministerial order to provide technical standards for electric leakage fire alarm
In accordance with the provision of Article 21-16 (3-1) of the Fire Service Act (Act No. 186 of
1948), the Ministerial order to revise all of the ministerial order to provide technical standards forelectric leakage fire alarm (Ordinance of the Ministry of Home Affairs No. 15 of 1976) shall consistof the following parts.
Table of contents
Chapter 1 General provisions (Article 1 to Article 10)
Chapter 2 Transformer (Article 11 to Article 23)
Chapter 3 Receiver (Article 24 to Artcle 36)
Chapter 4 Miscellaneous provisions (Article 37)
Supplementary Provisions
Chapter 1

General provisions

PurportArticle 1 This Ordinance covers the technical specifications applicable to the transformer andreceiver of electric leakage fire alarm.
Definitions of terms
Article 2 In this Ordinance, the meanings of the terms listed in the following items shall be asprescribed in the respective items.
(i) Electric leakage fire alarm
A facility that detects a leaking current of a monitored electric circuit with a voltage of 600 V
or less, alarms those who are concerned at the fire prevention target, and consists of atransformer and a receiver.
(ii) Current transformer
A device that automatically detects a leaked current in the monitored electric circuit andtransmits it to the receiver.
(iii) Receiver
A device that receives signals from the current transformer to alarm the occurrence of electricleakage to those who are concerned at the fire prevention target.
(iv) Integrated receiver
A receiver that is used in the combination of two or more current transformers and consists ofa set of devices such as power supplies and acoustic devices.

Type of current transformer
Article 3 Current transformers are categorized into the outdoor type and the indoor type dependingon the structure.
General structure
Article 4 Each part of the electric leakage fire alarm shall be made of materials of fine quality, andits wiring and installation shall be properly and securely implemented.
(2) The electric leakage fire alarm shall be durable.
(3) The electric leakage fire alarm shall not generate a significant level of noise orelectromagnetic interference.
(4) The components in the electric leakage fire alarm shall be used within the range of ratings.
(5) That charging part of the electric leakage fire alarm which is likely to be touched easily bypeople from outer area shall be sufficiently protected.
(6) The parts of the electric leakage fire alarm other than its terminals shall be stowed in a sturdy
enclosure case.
(7) The terminals of the electric leakage fire alarm shall be easily and securely connected toelectric wiring, including the earthing.
(8) The terminals of the electric leakage fire alarm, excluding the built-in terminals in theearthing terminals and distribution panels, among others, shall have appropriate covers.
(9) Earthing terminals shall be provided in the metal enclosure case of the current transformer or
receiver whose rated voltage is greater than 60 V (including the metal enclosure cases where
the outside of a non-metal, insular case attached with a decorative name plate, among others,with the insulation distance between the part and the charge part (only the ones whose voltage
is greater than 60 V) of less than 4 millimeters in air clearance and less than 6 millimeters increeping distance).
Structure and function of device or parts
Article 5 The device or parts in the electric leakage fire alarm in each of the following items shallhave the structure and function as stipulated in each of the following items, or above the same level.
(i) The acoustic device shall satisfy the requirements listed from (a) to (e) below:(a) The acoustic device shall generate the sound at 90% of the rated voltage.
(b) The acoustic pressure of the acoustic device at the rated voltage shall be 70 dB or more at apoint which is 1 meter in distance from the center of the acoustic device installed at a fixedlocation in an anechoic chamber (and in the case of the acoustic device installed inside a
receiver, the location under that condition).
(c) For the acoustic device with an intermittent alarm sound, the interval of alarm sound shallbe 2 seconds or less, and the beeping time shall be the interval or more.
(d) The insulation resistance between the charging part and the non-charging part shall be 5
megohms or more for the value measured with an insulation resistance meter of 500 V DC.
(e) The acoustic device shall continue to have the functions listed from (a) to (d) after 8 hours
of continuous beeping at the rated voltage, and that the acoustic device shall not fail instructure.
(ii) The electromagnetic relay shall comply with the requirements from (a) to (c) below:

(a) The electromagnetic relay shall have the structure where dust and other foreign objects do
not enter easily;(b) The materials used in the contact shall meet the requirements from 1. to 5. below:
1. Gold and silver alloy
2. Gold, silver, and platinum alloy
3. Platinum, gold, palladium, silver palladium alloy or rhodium
4. For the contact point whose contact pressure is 0.35 newton or more, silver, silvering,silver plating, or silver cadmium oxide
5. Spread, attachment, clad, or plating of one of the materials listed from 1. to 3.
(c) The contact point shall not be concurrently used with an external load. Note, however, that
this does not necessarily apply to an external acoustic device contact point.
(iii) The power transformer shall meet the requirements as stipulated in (a) and (b) below:(a) The performance of the power transformer shall comply with the insulation resistance,
withstand voltage, voltage deviation, temperature increase in coil, and the voltage
fluctuation rate as set forth in the Japanese industrial standards (as stipulated in Article
17(1) of the Industrial Standardization Act, Law No. 185 of 1949, hereinafter referred to as“JIS”) C 6436.
(b) The capacity shall withstand the continuous imposition of the maximum load current or the
maximum load current by design at the rated voltage.
(iv) The indicator lamp shall comply with the requirements from (a) to (c) below:(a) The light bulb, excluding discharge lamp and light-emitting diode (LED), shall not havecable disconnection, significant change in luminous flux, darkening, or significant decreasein current after 20 hours of continuous imposition of AC voltage at 130% of the rated
voltage in the circuits in use.
(b) Two or more light bulbs shall be connected in parallel. Note, however, that this does notnecessarily apply to discharge lamp and light-emitting diode.
(c) Under the condition of luminous intensity of 300 lux in the surroundings, the indicator
lamp shall be able to be clearly recognized as lit up from 3 meters in distance in the front.
(v) The switch shall meet the requirements from (a) to (c) below:(a) The switch shall function easily and securely, and the halting point shall be clear.
(b) The capacity of the contact point shall withstand the maximum usage current.
(c) The materials of the contact point (printed contact, conductive layer contact, among others,
and treated with anti-corrosion measure) shall be one of the materials listed from 1. to 6.
below:
1. Gold and silver alloy
2. Gold, silver, and platinum alloy
3. Platinum, gold, palladium, silver palladium alloy or rhodium
4. For the contact point whose contact pressure is 0.35 newton or more, or the contact point
whose contact pressure is a pressing force by a finger such as when pressing a keyboard
switch, silver, silvering, silver plating, or silver cadmium oxide
5. In the case of a contact point whose contact pressure is 3 newtons or more, phosphor
bronze, brass, or nickel silver.
6. Spread, attachment, clad, or plating of one of the materials listed from 1. to 4.

(vi) Indication electric meters shall meet the requirements for intrinsic error, insulation, andvoltage examination as stipulated in JIS C 1102-1 and JIS C 1102-2.
(vii) Fuse shall meet the requirements in (a) or (b) below:(a) JIS C 8352(b) JIS C 6575-1 and JIS C 6575-2
Attachment device
Article 6 The electric leakage fire alarm shall not have an attachment device that could impose
harmful effects on its functions.
Value of nominal operating current
Article 7 The value of nominal operating current of the electric leakage fire alarm (refers to thevalue of required leaking current that the manufacturer has set for the electric leakage fire alarm tooperate, hereinafter the same) shall be 200 mA or less.
(2) The stipulations in the previous paragraph shall be applied on the minimum value of theadjustment scope for electric leakage fire alarms that have a sensitivity adjustment device.
Sensitivity adjustment device
Article 8 The maximum value of adjustment for electric leakage fire alarms that have a sensitivity
adjustment device shall be 1 ampere or less.
Display
Article 9 The current transformer shall have a display of items in each of the following items at an
easily seen place in the way the display items do not easily become erased.
(i) The characters that state “current transformer for electric leakage fire alarm”(ii) Application number(iii) Type of device, either indoor type or outdoor type(iv) Rated voltage and rated current(v) Rated frequency(vi) Single-phase or three-phase, whichever is applicable(vii) Design output voltage(viii) Manufacturing year(ix) Manufacturer name, trademark, or marketer name(x) For terminals with polarity, the sign for that polarity(2) The receiver shall have a display of items in each of the following items, in accordance withthe categorizations in each of the following items, at an easily seen place in the way thedisplay items do not easily become erased.
(i) Receiver body(a) The characters that state “receiver for electric leakage fire alarm”(b) Application number(c) Rated voltage(d) Power supply frequency(e) Value of nominal operating current

(f) Working input voltage(g) Manufacturing year(h) Manufacturer name, trademark, or marketer name(i) For integrated receivers, the number of monitored circuits(j) Terminal signs for terminal plates (for terminals for power supply, terminal signs and thetype of current, either AC or DC), and rated voltage and rated current(k) For parts, part number (excluding cases where part number is displayed nearby)(l) For the control parts, such as the switch, “on,” “off,” and other display, as well as usage
instructions(m) For the fuse holder, the rated current of the fuse in use(n) Application number for the connectable current transformers(o) Other cautions for handling(p) Acoustic device(q) Type of current, AC or DC(r) Rated voltage and rated current(s) Manufacturing year(t) Manufacturer name or trademark(u) For terminals with polarity, the sign for that polarity
Test conditions
Article 10 The tests as stipulated from the next article to Article 23, as well as from Article 27 to
Article 36, shall be performed under the condition at the surrounding temperature of 5 degrees
centigrade or more and 35 degrees centigrade or less, with the relative humidity of 45% or more and
85% or less, unless otherwise stipulated in each article.
(2) In the tests as stipulated in the next article and Article 13, the voltage or the frequency of themonitored circuits shall use the voltage or the frequency of the current transformer, and theload used in the connection to the monitored circuits shall use the net load resistance.
(3) In the tests as stipulated in Article 14 and Article 15, the frequency of the circuit installed in
the monitored circuits or the circuit where one of its wires is connected to the current
transformer, shall use the rated frequency of the monitored circuits.
(4) In the tests as stipulated from Article 27 to 32, as well as Article 36, a voltage of the receiveror the frequency of the receiver shall use the receiver’s rated voltage or rated frequency.
Chapter 2

Current transformer

Functions of current transformer
Article 11 The current transformer shall meet the requirements in each of the following items
under the condition where current is not present in the monitored circuits in the test circuits as shownin Figure 1, or under the condition where the rated current of the current transformer is present at the
rated frequency of the current transformer. In these cases, the measurement of output voltage value
for the current transformer shall be implemented by connecting the output terminals with the
impedance which is the equivalent of the input impedance of the receiver connected to the current
transformer through the input terminal (hereinafter referred to as “the load resistance”).

(i) In the case where the test current is flown from 0 mA to 1,000 mA, the output voltage value
shall change proportionately to the test current value.
(ii) In the case the nominal operating current value of the receiver connected to the current
transformer is flown as the test current, the variation range of the output voltage value shallstay within the scope from 75% to 125% of the design output voltage value that meets thenominal operating current value.
(iii) In the case the test current that is 42% of the nominal operating current value of the receiverconnected to the current transformer is flown, the output voltage value shall be 52% or less ofthe design output voltage value that corresponds with the nominal operating current value.
(2) For current transformers that have the wires of the monitored circuits pierce through thetransformers themselves, the functions as stipulated in the previous paragraph shall be
retained under the condition where each wire of the monitored circuits pierce through thetransformer in the way the electromagnetic coupling strength toward the transformer of thewires does not achieve equilibrium.
Surrounding temperature test
Article 12 The indoor-type current transformer shall not fail in its structure and the functions as
stipulated in the previous article after being left under the surrounding temperatures of 10 degrees
Celsius below zero and 60 degrees Celsius for 12 hours each.
(2) The outdoor-type current transformer shall not fail in its structure and the functions as
stipulated in the previous article after being left under the surrounding temperatures of 20
degrees Celsius below zero and 60 degrees Celsius for 12 hours each.
On/off test for circuits
Article 13 The output voltage value of the current transformer shall stay below 52% of the design
output voltage value that corresponds with the nominal operating current value for the connected
receiver in the case where a load resistance is connected to the output terminal, and under thecondition of flowing 150% of the rated current of the current transformer in the monitored circuit,the switch of the monitored circuits shall be turned on and off for five times in 1 minute.
Strength test for short circuit current
Article 14 The current transformer shall not fail in its structure and the functions as stipulated in
Article 11 when load resistance is connected to the output terminal as in Figure 2, where an
overcurrent circuit breaker is set up on the power supply side of the monitored circuit, and the rated
voltage of the current transformer (for current transformers that have the electric wires of themonitored circuits pierce through the transformer itself, random voltage which is less than the rated
voltage of the transformer) is flown in the monitored circuits, with the short-circuit power factor
from 0.3 to 0.4 at 2,500 A, with a two-minute interval for 0.02 second for twice.
Excessive leakage test
Article 15 The current transformer shall not fail in its structure and the functions as stipulated in
Article 11 when a wire is connected to the current transformer as shown in Figure 3, where load

resistance is connected to the output terminal, to flow a current at 20% of the rated current as thecurrent value in the wire for five minutes.
Aging test
Article 16 The current transformer shall not fail in its structure and the functions as stipulated in
Article 11 after being left in the air at 65 degrees Celsius for 30 days.
Water-proof test
Article 17 The outdoor-type current transformer shall meet the requirements in each of thefollowing items after repeating twice of the following set of procedure – to be soaked in clean waterof 65 degrees Celsius for 15 minutes, to be soaked in a saturated solution made of sodium chloride at
0 degrees Celsius for 15 minutes.
(i) The outdoor-type current transformer shall pass the test in Article 20 under the condition of
being soaked in the saturated solution.
(ii) The outdoor-type current transformer shall pass the test in Article 21 under the condition of
being pulled out from the saturated solution, and it shall not fail in its structure and thefunctions as stipulated in Article 11.
Vibration test
Article 18 The current transformer shall not fail in its structure and the functions as stipulated in
Article 11 when vibrations of 1,000 times per minute in random directions are imposed at total
amplitude of 4 millimeters continuously for 60 minutes.
Impact test
Article 19 The current transformer shall not fail in its structure and the functions as stipulated in
Article 11 when the impact that is 50 times the size of the standard gravitational acceleration in
random directions is imposed 5 times.
Insulation resistance test
Article 20 The insulation resistance of the current transformer shall be 5 megohm or more in themeasurement by a 500 V DC insulation resistance tester when measured between the primarywinding and the secondary winding, and between the primary winding and/or the secondary winding
and the external metal part.
Dielectric strength test
Article 21 The insulation resistance in the test part in the previous article shall withstand aone-minute imposition of an AC voltage with the effective voltage 1,500 V that is close to the sine
wave at 50 Hz or 60 Hz (in the case the voltage in the monitored circuits exceeds 250 V, the value
obtained by multiplying the voltage in the monitored circuits by 2, and then added with 1,000 V).
Shock wave withstand voltage test
Article 22 The current transformer shall not fail in its structure and the functions as stipulated in
Article 11 when the impact wave voltage of 6 kilovolts in peak value, from the wave peak length of

0.5 microsecond to 1.5 microseconds, as well as the duration of wave tail from 32 microseconds to48 microseconds, both positive and negative, is imposed between the primary winding (for thecurrent transformers that have the electric wires of the monitored circuits pierce through thetransformer itself, the monitored circuits) and the external metal part, as well as between each of the
primary windings, for one time each.
Voltage drop prevention test
Article 23 The voltage drop of the monitored circuits of the current transformer (excluding thetype where the electric wires of the monitored circuits pierce through the transformer itself), when
the rated current is flown in the monitored circuits, shall be 0.5 V or less.
Chapter 3

ReceiverThe structure of receiver
Article 24 The structure of the receiver shall meet the requirements in each of the following items:(i) The receiver shall have a device that displays the state of power supply. In this case, thepower supply display shall be clearly distinguishable from the electric leakage display incolor.
(ii) The acoustic device in the receiver on the side of the power on and outside the receiver, andthe circuit that is wired in the way to supply power directly to display lamps, among others,
shall have effective protection in the case of short circuit in the external circuits.
(iii) The sensitivity control, other than the sensitivity adjustment device, shall not be exposed on
the external surface of the case.
Test device
Article 25 The receiver shall be installed with a test device that is able to impose not more than 2.5
times the design output voltage that corresponds with the nominal operating current value onto its
input terminal, as well as a test device that is able to examine whether disconnection has occurred or
not in the external wiring that leads toward the current transformer.
(2) The test devices as stipulated in the previous paragraph shall meet the requirements in each of
the following items:(i) The test device may be easily manually manipulated from the front of the receiver;(ii) The test device shall have appropriate mechanisms where the test operator would not forget tobring back switches and connections to the original positions.
(iii) With regards to collective receivers, test shall be able to be performed for each circuit, in
addition to the stipulations in Item 2 above.
Leakage display
Article 26 The receiver shall automatically display electric leakage by giving a red-color display
and emitting an acoustic signal in the case the receiver receives signals from the current transformer.
Receiver functions

Article 27 The receiver shall not operate within 30 seconds when 52% of the receiver’s design
output voltage that corresponds with the nominal operating current value as shown in Figure 4 is
imposed, and at the same time, the receiver shall operate within one second when 75% of thereceiver’s design output voltage that corresponds with the nominal operating current value isimposed.
(2) The collective receiver shall meet the requirements in each of the following items, in addition
to the requirements in the previous paragraph:(i) The collective receiver shall have a display device which clearly identifies and displays themonitored circuit where the leakage has occurred.
(ii) The device as stipulated in the previous item shall be able to continuously identify and display
the monitored circuit where the leakage has occurred even after the monitored circuit is shut
down.
(iii) In the case leaking current has occurred concurrently in two monitored circuits, the device
shall display leakage and monitored circuits.
(iv) In the case leaking current has occurred continuously in more than two monitored circuits, thedevice shall have the capacity that is able to withstand the maximum load.
Power supply voltage fluctuation test
Article 28 The receiver shall not fail in the functions as stipulated in the previous article in thecase the receiver’s power supply voltage is fluctuated between 90% to 110% of the rated voltage.
Surrounding temperature test
Article 29 The receiver shall not fail in its structure and the functions as stipulated in Article 27
after being left for at least 12 hours each under the surrounding temperatures of 10 degrees Celsius
below zero and 40 degrees Celsius.
Excessive input voltage test
Article 30 The receiver shall display leakage and shall not fail in its structure and the functions as
stipulated in Article 27 after a 50 V voltage is imposed on the signal input circuit, as shown in thetest circuit in Figure 5, for five minutes via the insulation that is equivalent of the impedance of thecurrent transformer.
Repeat test
Article 31 The receiver shall not fail in its structure and the functions as stipulated in Article 27
after 10,000 times of leak operations are imposed at the rated voltage of the receiver.
Vibration test
Article 32 The receiver shall not malfunction (the operation starts due to reasons other than thecause of leaking current) when vibrations of 1,000 times per minute in random directions are
imposed at total amplitude of 1 millimeter continuously for 10 minutes.
(2) The receiver shall not fail in its structure and the functions as stipulated in Article 27 when
vibrations of 1,000 times per minute in random directions are imposed at total amplitude of 4
millimeters continuously for 60 minutes.

Impact test
Article 33 The receiver shall not fail in its structure and the functions as stipulated in Article 27
when the impact that is 50 times the size of the standard gravitational acceleration in random
directions is imposed 5 times.
Insulation resistance test
Article 34 The insulation resistance of the transformer shall be 5 megohms or more in themeasurement by a 500 V DC insulation resistance tester when measured between the charge part andits external metal case (including ones with an insulated case attached with a metal name plate andother parts).
Dielectric strength test
Article 35 The insulation resistance in the test part in the previous article shall withstand aone-minute imposition of an AC voltage with the effective voltage 500 V that is close to the sine
wave at 50 Hz or 60 Hz (in the case the rated voltage (for the charge part on the primary side, therated voltage of the primary side; for the charge part on the secondary side, the rated voltage of thesecondary side, hereinafter the same in this article) exceeds 30 V but not more than 150 V, add 1,000
V, and in the case of exceeding 150 V, the value obtained by multiplying the rated voltage by 2, andthen added with 1,000 V).
Shock wave withstand voltage test
Article 36 The receiver shall not fail in its structure and the functions as stipulated in Article 27
when the impact wave voltage of 6 kilovolts in peak value, from the wave peak length of 0.5
microsecond to 1.5 microseconds, as well as the duration of wave tail from 32 microseconds to 48
microseconds, both positive and negative, is imposed in the test circuit as shown in Figure 6,
between the different pole terminals, as well as between the power supply terminal and the case, for
one time each.
Chapter 4

Miscellaneous provisions

Exceptions to the standards
Article 37 For the current transformer and receiver that have been newly developed, for which the
Minister of Internal Affairs and Communications deemed to have the equivalent to or better
performance than the products that comply with the stipulations in this ministerial order, based on
the form, structure, materials, and performance, may be deemed to have passed the technicalstandards set by the Minister of Internal Affairs and Communications, regardless of the stipulationsin this ministerial order.
Supplementary Provisions
This ministerial order shall take effect on April 1, 2014.

Power supply

Monitored circuit

Current
regulator

Load
Current transformer

Standard load
resistance

Note: The locations for the current transformer and the monitored circuit shall be
determined by the installation method of the current transformer.
Figure 1 Functional test for current transformers (concerning Paragraph 1, Article 11)

Current transformer

Loadresistance

Monitored circuit

Note: The locations for the current transformer and the monitored circuit shall be
determined by the installation method of the current transformer.
Figure 2Strength test for short circuit current (concerning Article 14)

Current
regulator
Current transformer
Loadresistance

Note: The locations for the current transformer and the monitored circuit shall be
determined by the installation method of the current transformer.
Figure 3

Excessive leakage test (concerning Article 15)

Primary wire

Terminal

Plastic, etc.
Digital voltage
voltmeter

Terminal

Figure 4

ReceiverStandard transformer

Receiver function test (concerning Paragraph 1, Article 27)

Resistor

Receiver

Isolation transformer

Figure 5

Excessive input voltage test (concerning Article 30)

Figure 6 Shock wave withstand voltage test (concerning Article 36)(1) In the case of non-energized statea. Between different power supply poles

Input
side

ReceiverPowersupply
side

Shock
wave
withstandvoltagetester

Implement test by alternating connections
Shock wave
withstand voltage
testerCurrent ransformer

Note: The locations for the current transformer and the monitored circuit shall be
determined by the installation method of the current transformer.

(b) Between the power supply terminal and the case

Input side

Power supply side

ReceiverCase
Implement test by alternating connections
Shock wave
withstand voltage tester

Note: In the case of a plastic case, place the receiver on a metal plate, and conduct the test
between the metal plate and the power supply terminal.
(2) In the case of energized statea. Between different power supply poles
Live wire application device Live wire
application device

Input
side

Shock wave
withstand voltage
testerReceiverPowersupplyside

Implement test byalternating connections
Currenttransformer

Shock wave
withstand voltage
testerNote: The locations for the current transformer and the monitored circuit shall be
determined by the installation method of the current transformer.
(b) Between the power supply terminal and the case

Input side

Case

ReceiverPowersupply side

Implement test byalternating connections

Live wire application device

Shock wave
withstand voltage

Note: In the case of a plastic case, place the receiver on a metal plate, and conduct the test
between the metal plate and the power supply terminal.