![ELECTRICAL](/images/new-backgrounds/174783/17478325x1.webp)
ELECTRICAL
GENERAL
The installation must conform to these instructions, the local code authority having jurisdiction, and the requirements of the power company. In the absence of code requirements follow the latest version of
Voltage applied to the heater should not vary more than +5% to
DO NOT ENERGIZE THE BRANCH CIRCUIT FOR ANY REASON BEFORE THE HEATER TANK IS FILLED WITH WATER. DOING SO WILL CAUSE THE HEATING ELEMENT TO BURN OUT.
The branch circuit is connected to the heater wiring through an opening provided on the heater.
WARNING
AN ELECTRICAL GROUND IS REQUIRED TO REDUCE RISK OF ELECTRIC SHOCK OR POSSIBLE ELECTROCUTION. The water heater should be connected to a separate, grounded, branch circuit with overcurrent protection and disconnect switch. The water heater should be grounded in accordance with national and local codes.
Check the heater model and rating plate information against the characteristics of the branch circuit electrical supply. DO NOT CONNECT THE HEATER TO AN IMPROPER SOURCE OF ELECTRICITY.
BRANCH CIRCUIT
The branch circuit wire and fuse size should be established through reference to the latest version of the National Electrical Code or other locally approved source in conjunction with the heater amperage rating. Branch circuit wires should be 75°C temperature rated. For convenience, portions of the wire size tables from the Code are reproduced here. It is suggested the electrician size the branch circuit at 125 percent of the heater ampere rating and further increase wire size as necessary to compensate for voltage drop in long runs. Branch circuit voltage drop should not exceed 3% at the heater.
TABLE
Not More Than Three Conductors in Raceway or Cable or Earth (Directly Buried), Based on Ambient Temperature of 30°C (86°F)
Size |
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| Temperature Rating of Conductor, See table |
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| Size | ||||
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| 60°C | 75°C | 85°C | 90°C | 60°C | 75°C |
| 85°C | 90°C |
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| (140°F) | (167°F) | (185°F) | (194°F) | (140°F) | (167°F) |
| (185°F) | (194°F) |
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| TYPES | TYPES | TYPES | TYPES | TYPES | TYPES |
| TYPES | TYPES |
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| RUW, T | FEPW | V, MI | TA, TBS | RUW, T | RH, RHW |
| V, MI | TA, TBS, |
|
AWG | TW, UF | RH,RHW |
| SA, AVB | TW, UF | RUH |
|
| SA, AVB |
|
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| RUH, |
| SIS, =FEP, |
| THW, |
|
| SIS, | AWG |
|
| THW, |
| =FEPB, |
| THWN |
|
| =RHH, |
|
MCM |
| THWN, |
| =RHH, |
| XHHW, |
|
| =THHN, | MCM |
|
| XHHW |
| =THHN, |
| USE |
|
| =XHHW* |
|
|
| USE, ZW |
| =XHHW* |
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18 | …… | …… | …… | 21 | …… | …… |
| …… | …… | …… |
16 | …… | …… | 22 | 22 | …… | …… |
| …… | …… | …… |
14 | 15 | 15 | 25 | 25 | …… | …… |
| …… | …… | …… |
12 | 20 | 20 | 30 | 30 | 15 | 15 |
| 25 | 25 | 12 |
10 | 30 | 30 | 40 | 40 | 25 | 25 |
| 30 | 30 | 10 |
8 | 40 | 45 | 50 | 50 | 30 | 40 |
| 40 | 40 | 8 |
6 | 55 | 65 | 70 | 70 | 40 | 50 |
| 55 | 55 | 6 |
4 | 70 | 85 | 90 | 90 | 55 | 65 |
| 70 | 70 | 4 |
3 | 80 | 100 | 105 | 105 | 65 | 75 |
| 80 | 80 | 3 |
2 |
| 115 | 120 | 120 | 75 | 90 |
| 95 | 95 | 2 |
1 |
| 130 | 140 | 140 |
| 100 |
| 110 | 110 | 1 |
0 |
| 150 | 155 | 155 |
| 120 |
| 125 | 125 | 0 |
00 |
| 175 | 185 | 185 |
| 135 |
| 145 | 145 | 00 |
000 |
| 200 | 210 | 210 |
| 155 |
| 165 | 165 | 000 |
0000 |
| 230 | 235 | 235 |
| 180 |
| 185 | 185 | 0000 |
250 |
| 255 | 270 | 270 |
| 205 |
| 215 | 215 | 250 |
300 |
| 285 | 300 | 300 |
| 230 |
| 240 | 240 | 300 |
350 |
| 310 | 325 | 325 |
| 250 |
| 260 | 260 | 350 |
400 |
| 335 | 360 | 360 |
| 270 |
| 290 | 290 | 400 |
500 |
| 380 | 405 | 405 |
| 310 |
| 330 | 330 | 500 |
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Ambient |
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| Ambient |
Temp.°C |
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| Temp.°F |
.82 | .88 | .90 | .91 | .82 | .88 |
| .90 | .91 | ||
.58 | .75 | .80 | .82 | .58 | .75 |
| .80 | .82 | ||
…… | .58 | .67 | .71 | …… | .58 |
| .67 | .71 | ||
…… | .35 | .52 | .58 | …… | .35 |
| .52 | .58 | ||
…… | …… | .30 | .41 | …… | …… |
| .30 | .41 |
=The load current rating and the overcurrent protection for these conductors shall not exceed 15 amperes for 14 AWG, 20 amperes for 12 AWG, and 30 amperes for 10 AWG copper; or 15 amperes for 12 AWG and 25 amperes for 10 AWG aluminum and
* For dry locations only. See 75°C column for wet locations.
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