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Old 10-14-2017, 04:19 PM   #21
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My statement is correct and Wesk’s Statement is correct. This discussion was about DC. When you get to AC It gets more complicated as you go from 120 to 240. I can give you several senerios with 120/240 were a neutral needs COP to protect the wire.
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Old 10-17-2017, 08:42 AM   #22
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Two clarifications/amplifications on #20:
1. The link in a double pole circuit breaker is internal to the circuit breaker. It is not the tie bar between the two toggles.
2. Branch circuits do not require double pole circuit breakers if the system is polarized, and there is a reverse polarity indicator or the system is fed from an isolation or polarization transformer.
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Old 10-17-2017, 09:13 AM   #23
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Quote:
Originally Posted by psneeld View Post

He wasnt tryingvto remove fuses, just move then off the bulkhead which is not dangerous..... in fact it may be safer if closer to the battery.
Yes, close is preferred as below from ABYC DC systems: The exceptions are given since the 7" spec is unfeasable in many installs. Especially when dealing with bolted in, Type T and other like fuses. And the fact that batteries are a maintenance item and best practice is to limit the connection complexity at the battery posts. And, I would add, to further the distance away from a hydrogen gas source.

E-9.10. DC POWER SOURCES
a. Overcurrent Protection Device Location - Ungrounded conductors other than cranking motor
conductors shall be provided with overcurrent protection within a distance of 7" of the point at
which the conductor is connected to the source of power measured along the conductor. (See
Figure 11.)
EXCEPTIONS: 1. If the conductor is connected directly to the battery tenninal the 7 inch distance
may be increased up to 72 inches.
2. If the conductor is between the source of power, other than the battery terminal,
and the required overcurrent protection device, and is contained
throughout its entire distance in a sheath or enclosure such as a conduit,
junction box, control box or enclosed panel, the 7 inch distance may be increased
up to 40 inches.
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Old 10-18-2017, 12:42 AM   #24
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Exception one only applies to sheathed wire.
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Old 10-18-2017, 07:31 AM   #25
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Quote:
Originally Posted by diver dave View Post
Yes, close is preferred as below from ABYC DC systems: The exceptions are given since the 7" spec is unfeasable in many installs. Especially when dealing with bolted in, Type T and other like fuses. And the fact that batteries are a maintenance item and best practice is to limit the connection complexity at the battery posts. And, I would add, to further the distance away from a hydrogen gas source.

E-9.10. DC POWER SOURCES
a. Overcurrent Protection Device Location - Ungrounded conductors other than cranking motor
conductors shall be provided with overcurrent protection within a distance of 7" of the point at
which the conductor is connected to the source of power measured along the conductor. (See
Figure 11.)
EXCEPTIONS: 1. If the conductor is connected directly to the battery tenninal the 7 inch distance
may be increased up to 72 inches.
2. If the conductor is between the source of power, other than the battery terminal,
and the required overcurrent protection device, and is contained
throughout its entire distance in a sheath or enclosure such as a conduit,
junction box, control box or enclosed panel, the 7 inch distance may be increased
up to 40 inches.
You left out an important piece..

"ABYC E-11
11.10.1.1.2 Overcurrent Protection Device Location - Ungrounded conductors shall be provided with overcurrent protection within a distance of seven inches (178 mm) of the point at which the conductor is connected to the source of power measured along the conductor (see FIGURE 14).

EXCEPTIONS:
1. Cranking motor conductors.

2. If the conductor is connected directly to the battery terminal and is contained throughout its entire distance in a sheath or enclosure such as a conduit, junction box, control box or enclosed panel, the overcurrent protection shall be placed as close as practicable to the battery, but not to exceed 72 inches (1.83 m).

3. If the conductor is connected to a source of power other than a battery terminal and is contained throughout its entire distance in a sheath or enclosure such as a conduit, junction box, control box or enclosed panel, the overcurrent protection shall be placed as close as practicable to the point of connection to the source of power, but not to exceed 40 inches (1.02 m).

4. Overcurrent protection is not required in conductors from self-limiting alternators with integral regulators if the conductor is less than 40 inches (1.02 m), is connected to a source of power other than the battery, and is contained throughout its entire distance in a sheath or enclosure.

5. Overcurrent protection is not required at an alternator if the ampacity of the conductor is equal to or greater than the rated output of the alternator

6. Pigtails less than 7 inches (178 mm) in length are exempt from overcurrent protection requirements."
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