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I saw several details for parking lot light pole base, where they run #10 ground wire and tie to rod inside the pole base. Why do we need this ground wire and rod inside pole base? For lightning protection? If the circuit feeds this parking lot light has equipment ground wire, do we still need...

Any folks out there involved in Data center, IT room designs - power distribution and branch circuiting aspect?

We plan to install I-line square D distribution panel (208/120V,3-Ph, 400A MCB) in a storage. The owner wants this panel to be flush mounted. My understand...if the distribution panel flush mounted, the breakers in panels shall be exposed. Is there a way we can protect people from accidentally...

If we have (2) separate 15kV feeders come into MV switchgear and (1) feeder comes out of this switchgear to feed a MV transfomer. Two comning feeders, each terminates in a 200A fused disconnect switch inside MV switchgear. Can these two fused disconnect switches be kirk-key interlock switches...

I have little experience with medium voltage stuffs, I have these below questions hope you guys can clear my head. I appreciate that. We have a project where we run new 15kV feeder from existing manhole at site to new medium switch pad. From this switch pad, we come out with (2) separate feeds...

We have a physician office with has en emergency generator sering only fire pump, the owner wants to have other load from other building to be also fed out of this generator (if generator size can handle). Will this violate any code issues? Since the generator will serves two different buidlding...

Does anyone have any problem to comply wih these sections from NFPA-110? Thanks! 5.6.7.5 Power for fans and pumps on remote radiators and heat exchangers shall be supplied from a tap at the EPS output terminals or ahead of the first load circuit overcurrent protective device. 7.2.2* Level 1...

1. Does the code still requires patient to have room smoke detector and connect to fire alarm system? 2. What's fire alarm supervisory signal? Thanks! anbm

Can anyone tell me which code and section requires all equipment under kitchen hood shall be protected by shunt trip breakers and those breakers shall be tripped via a signal from fire suppression system in case of fire? Thanks! anbm

I have this situation if anyone has experienced about it, please help, thanks: We have a hospital which has its own utility xfmrs and (4) emergency generators as backup emergency source. There is a medical office building (MOB) located next to the hospital which also has its own utility xfmr...

What's the difference between individual vs. group mounted circuit breakers in term of switchborad? It it depending on breakers and bus size? Are there any advantages to use group mounted CBs? Thanks!

what's the difference between switchboard and switchgear besides voltage rating and housing material? Thanks!

I have two questions hope some of you can clear for me: 1. I heard some where in NEC or building code indicates when you have a high rise office building, we have a. Provide an emeregncy generator b. Separate egress lighting + fire alarm load on a separate ATS from other load. Do you what...

How to calculate voltage drop at transformer secondary if we only know primary voltage and transformer size? Ex: I have 112.5kVA xfmr, 3-phase (480/208), actual primary voltage is 479.47V. Thanks!

Hi, I have to use point-to-point method to calculate fault current current and submit to Florida state. How to we calculate fault current at emergency generator and its first downstream panel? I mean I have standby 250kW, 480V/3PH, emergency generator EG1 which feeds emergency panel 'EDPH'...

Anyone knew any good free online sources, books to learn about medium voltage stuffs (cable type, sizing cable, breaker, fuse, relay, switchgear, substation, etc)? Anbm

Any fire alarm expert here? 1. Where do we need to install smoke + heat detectors? (not residential type, the one connect to fire alarm system) 2. Same question for voice evac system. Thank you!

What's the difference of these receptacles and their specific application if any? Thanks! 1. Hospital grade 2. Hospital grade - tamper resistant (safety type) 3. Commercial grade receptacle 4. Industrial grade receptacle 5. Residential receptacle TX-Man

can someone enlight me? 1. When do we need to use duct bank to run conduits? 2. Is there any specific rules to size duct bank? 3. Can we run power and telecom conduits in same duct bank? 4. When do we need to use manhole, what's typical spacing between manholes? 5. How do we size and spec...