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nicholas.harknett
Good Day,   In the process of setting appropriate safe work conditions for use on various pieces of electrical equipment, the team at my organization has uncovered some questions on appropriately applying the 50 V threshold for de-energized work.       Is anyone aware and willing to share the rationale behind the selection of 50 V as the… (Show more)
in Electrical
safetysaves2019
Good Afternoon,    When removing covers from electrical panels but leaving the deadfront in place are employees required to wear Arc Flash protection and follow approach boundaries? This is commonly done for visual investigation.    I understand that employees must be protected from exposed energized parts. The definition of Exposed (as applied… (Show more)
in Electrical
stepandmit
Greetings, Are there any NFPA mandated requirements that require HWH for emergency eyewash to be powered from stand-by system bus as opposed to "normal" system bus?  I have a system that has a normal bus supplied by utility and a standby bus supplied by diesel generator. I know a good practice would be to put HWH on the standby bus, but is there… (Show more)
in Electrical
matt.rudolph
I have parallel feeders to a 800 Amp MCC in separate raceways from the distribution breaker.  Does the wire have to be derated according to Table 310.15(B)(3)(a) from NFPA 70 code.  We are having a debate on the meaning of the highlighted sentence.  One interpretation is that it needs to be derated regarless because it's  a parallel feed.  The… (Show more)
in Electrical
chiefns830
In the 2017 NEC, MUST this receptacle have GFCI protection?   From what I'm reading I cannot determine if they mean ONLY the garage receptacles in "storage areas, work areas, and areas of similar use."
in Electrical
bwy
Is as access floor required to be grounded?  In an office building, carpeted tiles.  Power under floor in raceway.  Non-stringered flooring spec'd (tiles screwed down at each corner) and ground straps at corner.     250.4 (A)(3) and (4) required that normally non-current carrying conductive material enclosing electrical conductors....be connected… (Show more)
in Electrical
Steve Benton
I thought that as I close out this work week I would say thank you to all that contribute to making the use of electrical energy safer, more efficient, and easily accessible. Have a blessed holiday ! 
in Electrical
Steve Benton
I thought that I would open up a discussion where viewers of this thread could share what they perceive to be the greatest electrical safety concern that they encounter or perhaps the most frustrating electrical safety issue that never seems to get resolved. Having been in the electrical field some 37 years I can say with great confidence that… (Show more)
in Electrical
jon.sarrocco
I am installing temperature monitoring and alarm devices in a Class 1 Division 2 area  I'd like to get confirmation of my understanding from other professionals regarding the installation.  The alarm controller is in an explosion proof housing.  The RTD's that we will use are considered a simple apparatus, and will be wired directly to the… (Show more)
in Electrical
david_wise
When did the rule forbidding garage outlets on Small Appliance Branch Circuits begin? I know that it's 210.52(b) in 2014, 220-3(b) in 1974, 1962, and 1959, and 2115-b in 1956.
in Electrical
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