Fire Department. Regulations [RE-wrenches]

[William Miller]

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Friends:

I appreciate the valuable dialog here.  This forum has been a wealth of 
knowledge-- indispensable.  I have learned a few things in the last 24 
hours (some opinions expressed as well):

Venting:  Letting the smoke out is only one function of cutting a hole in 
the roof.  If the fire is in the kitchen, they want to cut a hole right 
over the kitchen and also dump water in.  So if the kitchen is on the south 
side of the house, cutting a hole in the north roof pitch is less effective.

Attics:  If the purpose of cutting the hole were only for venting, cutting 
a hole in the north pitch would help only if there was an attic connecting 
all sections of the home.  If any cathedral or vaulted ceilings exist, the 
need is to cut multiple holes.

Standards:  They are just now being developed.  I really prefer the Cal 
Fire setbacks.  Losing the short edge of a roof is far less of an impact on 
PV than losing the long edge.  The Cal Fire standards allow you to install 
right up to the lower eave and only require 3 foot clearance to the ridge 
and gable eaves.

Quick disconnects:  They are mentioned in the LA Fire Department standards 
for both hardware and connectors but not really explained.  They are not 
mentioned in the Cal Fire.  In San Luis Obispo, the fire marshal is willing 
to let us install in the setback area if there is some means to quickly 
remove or "flop over" rows of modules at a maximum of 4 modules per 
move.  This is a great precedent and one I hope we can encourage.  This 
means the industry can develop hardware to allow us to use the precious 
roof space we need (and the customer needs).  I encourage each of you to 
promote this to your local fire marshal.  I also encourage entrepreneurs to 
develop hardware and connectors to allow us to install PV in the disputed 
zones and still allow fire fighters to clear them from the roof with utmost 
expediency.  This is a market opportunity, folks.

PV modules starting fires/fire fighter safety:  One poster here supposed 
this was about PV systems starting fires.  It is not.  This is about 
allowing fire fighters to do their dangerous work without further 
impediments.  Fire fighters should not be expected to walk on the slippery 
surface of PV modules nor should they be expected to cut or break through 
energized modules.  Depending on which module you break, you might achieve 
contact with up to 600 VDC.

Politics:  In my opinion, we must avoid any perception that we do not care 
about the safety of fire fighters.  I tell my crew, "I'll give the money 
back to my clients before I'll see one of you hurt on the job."   We must 
have the same empathy with fire fighters.  With some negotiation and 
technical advances, we can accommodate their needs and ours.

Roof top disconnects:  Nowhere do I see any provisions to protect fire 
fighters from cutting into conduits with high voltage DC.  It seems to me 
this is also a hazard.  I hesitate to bring this up, but why not get this 
all solved at once?   I think that firefighters use demolition saws to cut 
through roofs and these saws can cut through EMT like butter. My opinion: 
The 200 5 NEC standard for metal conduit is almost enough.  I would 
add:  No aluminum conduit and, conduits must not run under 
rafters.  Instead, conduits should leave roof surfaces at 90 degrees and 
stay a minimum of 18" away from the underside of a roof.

Thanks again for all of your thoughts and support.  I really think we can 
get a good solution that may coast a few dollars more but will not reduce 
system size.

William Miller

PS:  LAFD and Cal Fire standards are now on our web 
site:  www.mpandc.com/resources/resources.html


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