Is there a non-contact medium voltage tester for use with a "shot gun" hot stick? I have 12470 volts at the load break elbow connections in the primaries of our pad mounted distribution transfomers. The load break elbows have an external grounding conductor, a bare solid #12, and they all...
About figuring fault current values on secondary distribution feeder circuits - I have a question. When plugging the type of conduit (PVC, RMC, etc.) into the equation do I enter steel or PVC if the conduit run has steel elbows only and mostly PVC?
I'm having an engineering outfit do the...
We have about 45 facilities each averaging about 30 emergency fixtures - predominately 2X4 T8 Troffers and as of late, T5HO pendants. Our problem is that 90% of them aren't self diagnosing so we do the yearly 90 minute burn test. We have about a 20% failure rate, about half of those battery...
I have a fire suppression water reservoir tank of about 65K gallons of water. We had about 120 gallons of diesel get into the tank. We have pumped it out a few times and have the vast majority of the diesel out. I'm trying to find out if there is a substance I can put in the tank to clean the...
I have a 400Hz Freq. Converter, 480V Delta input with a 208/120V Y output. Do I treat the Manual Transfer Switch located downstream as the Main - Grounds and neutrals bonded together. The freq converter is a seperately derived system is it not? After I get this cleared up then I have a question...
I want to change some of our "Standard Work Practices". I want to ban all die cast fittings and use only steel. Can the argument be made that the steel fittings are better, and if so, how? I know they cost more, but if I can get better bonding results then I'm OK with that.
I have a facility that has two sources of power available and want to put a transfer switch in. Each of my two sources are padmount transformers. Do I need overcurrent protection on each source - between the transformer and ATS?
I have a question about the issuing of rubber insulating gloves: Are they to be issued to employees or are they allowed to be a "community" type of Personnel Protective Equipment (PPE). I thought at one time OSHA (29 CFR 1910.269) stated that gloves would be worn by only one person, but now I...
To get all my switchgear and transformers in compliance with NFPA 70 (NEC 110.16) as far as getting labels indicating arc flash hazards and giving appropriate PPE levels, what is the formula for calculating fault current -at the main and at subsequent sub-panels? Also, can I calculate fault...
To get all my switchgear and transformers in compliance with NFPA 70 (NEC 110.16) as far as getting labels indicating arc flash hazards and giving appropriate PPE levels, what is the formula for calculating fault current - at the main and at subsequent sub-panels? Also, can I calculate fault...
