State Industries SSE-120, SSE-5 warranty Electrical, Branch Circuit

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 NFPA-70, The National Electrical Code which may be ordered from: American National Standards Institute, 1430 Broadway, New York, NY 10018.

Voltage applied to the heater should not vary more than +5% to -10% of the model and rating plate marking for satisfactory operation.

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 310-16. Allowable Ampacities of Insulated Conductors

Not More Than Three Conductors in Raceway or Cable or Earth (Directly Buried), Based on Ambient Temperature of 30°C (86°F)

Size			Temperature Rating of Conductor, See table 310-13						Size
	60°C	75°C	85°C	90°C	60°C	75°C	85°C	90°C
	(140°F)	(167°F)	(185°F)	(194°F)	(140°F)	(167°F)	(185°F)	(194°F)
	TYPES	TYPES	TYPES	TYPES	TYPES	TYPES	TYPES	TYPES
	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
		RUH,		SIS, =FEP,		THW,		SIS,	AWG
		THW,		=FEPB,		THWN		=RHH,
MCM		THWN,		=RHH,		XHHW,		=THHN,	MCM
		XHHW		=THHN,		USE		=XHHW*
		USE, ZW		=XHHW*
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
Ambient									Ambient
Temp.°C									Temp.°F
31-40	.82	.88	.90	.91	.82	.88	.90	.91	86-104
41-50	.58	.75	.80	.82	.58	.75	.80	.82	105-122
51-60	……	.58	.67	.71	……	.58	.67	.71	123-141
61-70	……	.35	.52	.58	……	.35	.52	.58	142-158
71-80	……	……	.30	.41	……	……	.30	.41	159-176

=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 copper-clad aluminum.

* For dry locations only. See 75°C column for wet locations.

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