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j_w_hines
For an existing conference room where the Architect required adding an outlet, the plan check person has required outlets as per this article, which requires quantity as in a residence.  In addition, it requires floor receptacles for each 215 square feet of room.   For one room, it is smaller and has doors each wall, as code does not restrict,… (Show more)
in Electrical
mdemps3
Does NEC 680.7 apply to factory and field installed lugs, the way I read it is the first sentence would apply to factory lugs and the second sentence would apply to field installed lugs. 
in Electrical
pwk@kraemerkoating.com
Hi,   I work for an equipment manufacturer.  For a machine we are building, I have a VFD for an Exhaust Blower that requires 480 VAC 3-phase 6 amps.  The VFD is designed so that it can be mounted on a wall without having to be inside an electrical enclosure.  Typically, the exhaust blower is located inside a building.  In these cases, I provide a… (Show more)
in Electrical
gk1226
Pa started following the 2014 NEC so my questions is 1) 210.12(A) - does a dishwasher for a dwelling require AFCI protection if on a dedicated circuit (I know it needs GFCI protection) 2) same question, how about a waste disposal at the sink? 3) Looking at 550.25(B) - if a furnace is replaced (in a mobile home) and new wire is installed, does… (Show more)
in Electrical
mdemps3
I am reviewing plans that specify an emergency system and a optional system, the generator has 2 breakers one for each system, but the optional system ATS is specified to be installed to re-feed the entire existing 800 amp switchboard. The emergency ATS is connected to a breaker in that same 800 amp switchboard that feeds the normal side of the… (Show more)
in Electrical
pwk@kraemerkoating.com
Hi,   I am working on a project in which I will be using a VFD to drive an AC motor.  For the motor power cable from the VFD to the motor, I am planning to use a cable with a braided shield that is specifically intended for use with VFD's.  The cable will have three current carrying conductors and one ground conductor.  Table 310.16 in the 2020… (Show more)
in Electrical
justin.grantham
When working 120Volt Circuits live Receptacles, switches what PPE is required?
in Electrical
cfharr
Since the 2014 edition, 240.21(B)(1)(1)(b) has allowed a 10 ft feeder tap to terminate on "equipment containing an overcurrent device" as an alternative to terminating directly on an OCPD.   I would like to connect utilization equipment (in this case, EVSE for vehicle charging) to a feeder tap. The EVSE manufacturer asserts that, because there is… (Show more)
in Electrical
jrendon6861
I have a question.  If there is a crew going out to do some  electrical maintenance. But only one member of the crew is a qualified electrician. do the other people assisting him need to have CPR and other training. Or can they rely on the fact that someone nearby : say another crew close by working 3 min away. Has CPR training and safety ...   … (Show more)
in Electrical
safedesign1
There is a product that we want to install in a ceiling in a Healthcare facility and understand the requirements of firestopping for cables but what is the permissible gap for an opening to limit the spread of smoke and fire since the product has tolerances of 1.2mm due to plastic molding. Does this airgap present a danger? Ceiling tiles are not… (Show more)
in Electrical
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