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Re: Battery Boxes...What One Company Designed - Page 3

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Posted by Dan Lanciani on September 17, 2005, 7:18 pm
 
MFHult@nothydrologistnot.com (Marc F Hult) writes:

[big snip]
| Together they provide nominal 60 amps at 28vdc and 20 amps 14vdc =~2000 watts.
|
| A Baldor natural gas 28vdc genset has been purchased (not yet installed) to
| kick in during power outages that has additional capacity for additional 28vdc
| and 120VAC UPS needs. Controller is a Bouchette A120
|
| http://www.bouchette.com/Products/A120C.htm
|
| The choice of 28vdc was driven in large part because this the highest nominal
| voltage that meets the requirements of the under-30-volt sections of the
| National Electrical code (NEC).

What NEC circuit class does your 28V wiring fall under?

                Dan Lanciani
                ddl@danlan.*com

Posted by Marc F Hult on September 17, 2005, 9:59 pm
 
On 17 Sep 2005 19:18:03 GMT, ddl@danlan.*com (Dan Lanciani) wrote in message

MFHult@nothydrologistnot.com (Marc F Hult) writes:

Depends on which circuit *after* the UL-listed class 2 supply you ask about.

As needed and appropriate, and depending on overcurrent devices and intervening
converters, the subsequent wiring complies with:

Article 411 lighting  (isolated; <30 volts/42.4v peak); max 20 amp branch
circuit supply; max 25amp lighting circuit; Class 2 power source; not grounded )

Article 720  ( <50 volts; =>12AWG wiring; Article 240 overcurrent )

Article 725.21 Class 1 ( <30 volts and <1000 volt-amp )

Article 725 Class 2/3  (This is what my 24vdc dimmers operate under)

725.21 A0
Class 1 Power-Limited Circuits. These circuits shall
be supplied from a source that has a rated output of not
more than 30 volts and 1000 volt-amperes.

725.51 Wiring Methods on Supply Side of the Class 2
or Class 3 Power Source. Conductors and equipment on
the supply side of the power source shall be installed in
accordance with the appropriate requirements of Chapters 1
through 4. Transformers or other devices supplied from
electric light or power circuits shall be protected by an
overcurrent device rated not over 20 amperes.

725.41 Power Sources for Class 2 and Class 3 Circuits.
(A) Power Source. The power source for a Class 2 or a
Class 3 circuit shall be as specified in 725.41(A)(1), (2),
(3), (4), or (5):
FPN No. 1: Figure 725.41 illustrates the relationships between
Class 2 or Class 3 power sources, their supply, and
the Class 2 or Class 3 circuits.
FPN No. 2: Table 11(A) and Table 11(B) in Chapter 9
provide the requirements for listed Class 2 and Class 3
power sources.
(1) A listed Class 2 or Class 3 transformer
(2) A listed Class 2 or Class 3 power supply
(3) Other listed equipment marked to identify the Class 2
or Class 3 power source

Comments/corrections/additions welcomed.

 ... Marc
Marc_F_Hult
www.ECOntrol.org

Posted by Dan Lanciani on September 17, 2005, 10:35 pm
 MFHult@nothydrologistnot.com (Marc F Hult) writes:
| On 17 Sep 2005 19:18:03 GMT, ddl@danlan.*com (Dan Lanciani) wrote in message
|
| MFHult@nothydrologistnot.com (Marc F Hult) writes:
| >
| >[big snip]
| >| Together they provide nominal 60 amps at 28vdc and 20 amps 14vdc =~2000
| >|watts.
| >|
| >| A Baldor natural gas 28vdc genset has been purchased (not yet installed) to
| >| kick in during power outages that has additional capacity for additional
| >|28vdc
| >| and 120VAC UPS needs. Controller is a Bouchette A120
| >|
| >| http://www.bouchette.com/Products/A120C.htm
| >|
| >| The choice of 28vdc was driven in large part because this the highest
nominal
| >| voltage that meets the requirements of the under-30-volt sections of the
| >| National Electrical code (NEC).
| >
| >What NEC circuit class does your 28V wiring fall under?
|
| Depends on which circuit *after* the UL-listed class 2 supply you ask about.

What serves as the class 2 supply?

                Dan Lanciani
                ddl@danlan.*com

Posted by Marc F Hult on September 17, 2005, 11:15 pm
 On 17 Sep 2005 22:35:17 GMT, ddl@danlan.*com (Dan Lanciani) wrote in message

MFHult@nothydrologistnot.com (Marc F Hult) writes:

nominal

Inteli-Power PD9180 and PD9160 (now Progressive Dynamics) as I wrote in my
previous post. See

http://www.progressivedyn.com/power_converters.html

I'll try to post some pictures to my web site in the next few days.



Marc_F_Hult
www.ECOntrol.org

Posted by Dan Lanciani on September 18, 2005, 2:52 am
 MFHult@nothydrologistnot.com (Marc F Hult) writes:
| On 17 Sep 2005 22:35:17 GMT, ddl@danlan.*com (Dan Lanciani) wrote in message
|
| MFHult@nothydrologistnot.com (Marc F Hult) writes:
| >| On 17 Sep 2005 19:18:03 GMT, ddl@danlan.*com (Dan Lanciani) wrote in message
| >|
| >| MFHult@nothydrologistnot.com (Marc F Hult) writes:
| >| >
| >| >[big snip]
| >| >| Together they provide nominal 60 amps at 28vdc and 20 amps 14vdc =~2000
| >| >|watts.
| >| >|
| >| >| A Baldor natural gas 28vdc genset has been purchased (not yet installed)
| to
| >| >| kick in during power outages that has additional capacity for additional
| >| >|28vdc
| >| >| and 120VAC UPS needs. Controller is a Bouchette A120
| >| >|
| >| >| http://www.bouchette.com/Products/A120C.htm
| >| >|
| >| >| The choice of 28vdc was driven in large part because this the highest
| nominal
| >| >| voltage that meets the requirements of the under-30-volt sections of the
| >| >| National Electrical code (NEC).
| >| >
| >| >What NEC circuit class does your 28V wiring fall under?
| >|
| >| Depends on which circuit *after* the UL-listed class 2 supply you ask about.
| >
| >What serves as the class 2 supply?
| >
| >                Dan Lanciani
| >                ddl@danlan.*com
|
|
| Inteli-Power PD9180 and PD9160 (now Progressive Dynamics) as I wrote in my
| previous post. See
|
| http://www.progressivedyn.com/power_converters.html

Interesting.  I had no idea that you could get class 2 supplies with such
high power output.  Maybe I'll have to reconsider my low-voltage distribution
analysis...

                Dan Lanciani
                ddl@danlan.*com

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