Hello everyone,
I am Luigi and writing from Italy, sorry for the (bad) English.
I am writing on this forum because of a doubt regarding the installation of single-core cables in Class I, Div.2 classified area.
I need to feed a 150 kW electric heater with a maximum cable entry head temperature of 100°C.
The manufacturer of the heater has equipped the heater head with four 1 1/2" cable entries, one for each phase plus ground.
Because the power and the temperature, I am forced to use a single-core high-temperature (silicone or high temp PVC) cables with a 150 mm2 cross section instead of MC-ER-HL XLPE 90°C cable.
Since it is not a cable suitable for exposed run and for hazardous location (ER-HL), I must lay it inside a RMC conduit, as required by NEC article 500 and subsequent, but only one cable for each conduit to be able to enter the heater head.
Therefore have the problem of induction heating of the RMC for which I was thinking of using RMC and fittings made of aluminum, or brass for some fittings.
Can be a reasonable solution?
Are there any restrictions in pursuing this approach?
Unfortunately, this seems to me to be the only possible solution to be able to feed the electric heater unless to redo the cable entry head with a 3" input.
thankyou very much to all in advance.
I am Luigi and writing from Italy, sorry for the (bad) English.
I am writing on this forum because of a doubt regarding the installation of single-core cables in Class I, Div.2 classified area.
I need to feed a 150 kW electric heater with a maximum cable entry head temperature of 100°C.
The manufacturer of the heater has equipped the heater head with four 1 1/2" cable entries, one for each phase plus ground.
Because the power and the temperature, I am forced to use a single-core high-temperature (silicone or high temp PVC) cables with a 150 mm2 cross section instead of MC-ER-HL XLPE 90°C cable.
Since it is not a cable suitable for exposed run and for hazardous location (ER-HL), I must lay it inside a RMC conduit, as required by NEC article 500 and subsequent, but only one cable for each conduit to be able to enter the heater head.
Therefore have the problem of induction heating of the RMC for which I was thinking of using RMC and fittings made of aluminum, or brass for some fittings.
Can be a reasonable solution?
Are there any restrictions in pursuing this approach?
Unfortunately, this seems to me to be the only possible solution to be able to feed the electric heater unless to redo the cable entry head with a 3" input.
thankyou very much to all in advance.